Proceedings

Editorial

Jump to: Other

3 pages, 198 KiB

Open AccessEditorial

Introduction to Eurosensors 2017, Paris, 3–6 September 2017

by Jean-Paul Viricelle and Christophe Pijolat

Proceedings 2017, 1(4), 1097; https://doi.org/10.3390/proceedings1041097 - 21 Nov 2017

Viewed by 2853

Abstract

EUROSENSORS 2017, the XXXI edition of the conference series, was held in PARIS at UIC-P Congress Center close to the Tour Eiffel, from September 3 to 6, 2017 for the third time in France, after Toulouse 1994 and Lyon 2007. [...] Full article

(This article belongs to the Proceedings of Proceedings of Eurosensors 2017, Paris, France, 3–6 September 2017)

Other

Jump to: Editorial

5 pages, 546 KiB

Open AccessProceeding Paper

Electromagnetic Characterization and Simulation of a Carbonate Buffer System on a Microwave Biosensor

by Lisa-Marie Wagner, Florian Strasser, Eva Melnik and Martin Brandl

Proceedings 2017, 1(4), 276; https://doi.org/10.3390/proceedings1040276 - 17 Aug 2017

Viewed by 2925

Abstract

In order to develop a fast, sensitive and easy-to-produce biosensor, a high-quality microwave split-ring resonator is going to be developed. In the final sensing device, a blood sample will be placed as a droplet on the sensitive area of the sensor. In case [...] Read more.

In order to develop a fast, sensitive and easy-to-produce biosensor, a high-quality microwave split-ring resonator is going to be developed. In the final sensing device, a blood sample will be placed as a droplet on the sensitive area of the sensor. In case of specific target biomolecules binding a shift in resonance frequency will be induced due to the effective permittivity change. This shift in resonance frequency depends on the concentration of biomolecules and is therefore quantitative. The aim of this work is to find a position for the bio-functionalization that providesa measurable frequency shift when the analyte is added. Different areas are tested experimentally and via simulations. Two buffer solutions are used which have to be characterized in terms of its electromagnetic properties in advance. This preliminary study should pave the way for the measurements in real human samples such as serum or plasma. Full article

(This article belongs to the Proceedings of Proceedings of Eurosensors 2017, Paris, France, 3–6 September 2017)

► Show Figures

Figure 1

5 pages, 538 KiB

Open AccessProceeding Paper

Two-Directional Operation of Bistable Latchable Micro Switch Actuated by a Single Electrode

by Lior Medina, Rivka Gilat, Bojan Ilic and Slava Krylov

Proceedings 2017, 1(4), 277; https://doi.org/10.3390/proceedings1040277 - 16 Aug 2017

Cited by 4 | Viewed by 2292

Abstract

Curved micromechanical beams are a versatile platform for exploring multistable behavior, with potential applications in mechanical based logic elements and electrical and optical switches. Here we demonstrate bidirectional electrostatic actuation of a bistable, latched, micromechanical beam by the same electrode, which was used [...] Read more.

Curved micromechanical beams are a versatile platform for exploring multistable behavior, with potential applications in mechanical based logic elements and electrical and optical switches. Here we demonstrate bidirectional electrostatic actuation of a bistable, latched, micromechanical beam by the same electrode, which was used for the snap-through switching of the device. The release of the mechanically-latched beam is achieved by pre-loading the structure using a rising voltage applied to the electrode, followed by a sudden decrease of the voltage. This abrupt removal of the loading results in a transient response and dynamic snap-back of the beam. Full article

(This article belongs to the Proceedings of Proceedings of Eurosensors 2017, Paris, France, 3–6 September 2017)

► Show Figures

Figure 1

4 pages, 1030 KiB

Open AccessProceeding Paper

Modelling New Techniques for Improving Separation in Miniature Capillary- and Planar-Based Capillary Electrophoresis Systems

by Adam Lewis and Nick Harris

Proceedings 2017, 1(4), 278; https://doi.org/10.3390/proceedings1040278 - 16 Aug 2017

Cited by 1 | Viewed by 2249

Abstract

The capillary/channel length is an important factor in capillary electrophoresis (CE) systems since it is directly related to the amount of separation attainable. In this work we present methods to increase the effective channel length without the need to modify the physical channel [...] Read more.

The capillary/channel length is an important factor in capillary electrophoresis (CE) systems since it is directly related to the amount of separation attainable. In this work we present methods to increase the effective channel length without the need to modify the physical channel length. Using an electrode located close to the capillary surface it is possible to dynamically modify zeta-potential and therefore the electroosmotic flow (EOF). By controlling the EOF, certain ionic species within a sample can be held in a short channel whilst other species migrate along the channel. Alternatively the sample can be transported back and forth along the active channel length until sufficient separation has been attained. CE enables detailed analysis of a sample’s composition and this is of interest to a range of applications. Full article

(This article belongs to the Proceedings of Proceedings of Eurosensors 2017, Paris, France, 3–6 September 2017)

► Show Figures

Figure 1

5 pages, 298 KiB

Open AccessProceeding Paper

Analytical Model of Double Barrier THz Rectifier

by Fabrizio Palma and Rosario Rao

Proceedings 2017, 1(4), 279; https://doi.org/10.3390/proceedings1040279 - 31 Aug 2017

Viewed by 1928

Abstract

The application of the new structure to the complex field of THz receivers requires the availability of an analytical model, reliable and able to highlight the dependence on the parameters of the physical structure. We present a model of the rectification capability of [...] Read more.

The application of the new structure to the complex field of THz receivers requires the availability of an analytical model, reliable and able to highlight the dependence on the parameters of the physical structure. We present a model of the rectification capability of the double barrier Terahertz radiation (THz) detector, a CMOS compatible structurer. The model is based on the hydrodynamic semiconductor equations; solved in the small signal approximation. The model highlights the high frequency dynamics of carriers in the structure; and furnishes new insight on the origin of the self-mixing rectification process. Full article

(This article belongs to the Proceedings of Proceedings of Eurosensors 2017, Paris, France, 3–6 September 2017)

► Show Figures

Figure 1

4 pages, 1398 KiB

Open AccessProceeding Paper

Geometrical Optimisation of Diode-Based Calorimetric Thermal Flow Sensors through Multiphysics Finite Element Modelling

by Ethan L. Gardner, Andrea De Luca, Claudio Falco and Florin Udrea

Proceedings 2017, 1(4), 280; https://doi.org/10.3390/proceedings1040280 - 11 Aug 2017

Cited by 5 | Viewed by 1980

Abstract

For the first time, 3D multiphysics finite element modelling has been used to optimise the geometry of a calorimetric thermal flow sensor. The model involves and couples three physics domains: electric, thermal and fluid mechanics. The model is validated against experimental data obtained [...] Read more.

For the first time, 3D multiphysics finite element modelling has been used to optimise the geometry of a calorimetric thermal flow sensor. The model involves and couples three physics domains: electric, thermal and fluid mechanics. The model is validated against experimental data obtained from a thermoelectronic flow sensor comprising of a tungsten heating resistor and temperature sensing diodes. Upstream and downstream diodes measure the temperature change caused by the asymmetric thermal profile when gas flow is introduced. The optimum distance between the diodes and the heater is shown along with the advantages of altering heater and membrane geometries, providing the knowledge for application-driven sensor optimisation. Full article

(This article belongs to the Proceedings of Proceedings of Eurosensors 2017, Paris, France, 3–6 September 2017)

► Show Figures

Figure 1

5 pages, 626 KiB

Open AccessProceeding Paper

Modelling Cross Axis Sensitivity in MEMS Coriolis Vibratory Gyroscopes

by Luca Guerinoni, Luca Giuseppe Falorni and Gabriele Gattere

Proceedings 2017, 1(4), 281; https://doi.org/10.3390/proceedings1040281 - 17 Aug 2017

Cited by 10 | Viewed by 2909

Abstract

In this paper a Cross Axis evaluation methodology is presented. The Cross Axis Sensitivity value depends on backend testing position tolerances as well as technological features and design properties of the MEMS gyroscope. A numerical model was developed to take into account the [...] Read more.

In this paper a Cross Axis evaluation methodology is presented. The Cross Axis Sensitivity value depends on backend testing position tolerances as well as technological features and design properties of the MEMS gyroscope. A numerical model was developed to take into account the sources of cross axis related to the last two contributions, not considering backend tolerances. Given a specific structure for the AM gyroscope, the asymmetries in the MEMS structure are acknowledged as the main sources for the cross axis. The results of the harmonic FEM simulations were finally compared with real testing data, thus proving the validity of the developed FEM model. Full article

(This article belongs to the Proceedings of Proceedings of Eurosensors 2017, Paris, France, 3–6 September 2017)

► Show Figures

Figure 1

4 pages, 1029 KiB

Open AccessProceeding Paper

Reduction of Electrostatic Control Voltage with a Tri-Electrode Actuator

by Yu Zhou and Cyrus Shafai

Proceedings 2017, 1(4), 282; https://doi.org/10.3390/proceedings1040282 - 11 Aug 2017

Cited by 3 | Viewed by 2015

Abstract

We present a new tri-electrode topology for reducing the control voltage for electrostatic actuators. Conventional parallel plate actuators are dual-electrode systems, formed by the MEMS structure and the drive electrode. By placing a perforated intermediate electrode between these elements, a tri-electrode configuration is [...] Read more.

We present a new tri-electrode topology for reducing the control voltage for electrostatic actuators. Conventional parallel plate actuators are dual-electrode systems, formed by the MEMS structure and the drive electrode. By placing a perforated intermediate electrode between these elements, a tri-electrode configuration is formed. This topology enables a low voltage on the intermediate electrode to modulate the electrostatic force on the MEMS device, while the higher voltage on the drive electrode remains fixed. Results presented show that in comparison to conventional parallel plate electrostatic actuators, the intermediate electrode’s modulating voltage can be as low as 20% of normal, while still providing the full actuation stroke. Full article

(This article belongs to the Proceedings of Proceedings of Eurosensors 2017, Paris, France, 3–6 September 2017)

► Show Figures

Figure 1

5 pages, 621 KiB

Open AccessProceeding Paper

Humidity Sensitivity and Coil Design of a High-Precision Eddy-Current Displacement Sensor

by Johan G. Vogel, Vikram Chaturvedi and Stoyan Nihtianov

Proceedings 2017, 1(4), 283; https://doi.org/10.3390/proceedings1040283 - 28 Aug 2017

Viewed by 2539

Abstract

Unlike capacitive displacement sensors, Eddy-Current Displacement Sensors (ECDSs) possess an inherently low sensitivity to environmental conditions, such as the humidity of the ambient air. By elevating the excitation frequency it is possible to mitigate their major limitations regarding stability and resolution, making them [...] Read more.

Unlike capacitive displacement sensors, Eddy-Current Displacement Sensors (ECDSs) possess an inherently low sensitivity to environmental conditions, such as the humidity of the ambient air. By elevating the excitation frequency it is possible to mitigate their major limitations regarding stability and resolution, making them of interest for high-precision displacement sensing. However, by increasing the excitation frequency, ECDSs become less immune to environmental conditions, due to the inevitable parasitic capacitance of the sensing coil. In this work, we formulate a requirement for the minimum Self-Resonance Frequency (SRF) of the coil, based on the specified humidity variation and the allowable displacement error. This requirement provides an input for the design of the high-precision ECDS probe. Full article

(This article belongs to the Proceedings of Proceedings of Eurosensors 2017, Paris, France, 3–6 September 2017)

► Show Figures

Figure 1

5 pages, 319 KiB

Open AccessProceeding Paper

Analytical Calculation of Falling Droplets from Cylindrical Capillaries

by Sebastian Hummel, Martin Bogner, Michael Haub, Joachim Sägebarth and Hermann Sandmaier

Proceedings 2017, 1(4), 284; https://doi.org/10.3390/proceedings1040284 - 7 Sep 2017

Viewed by 2473

Abstract

Existing investigations to estimate different properties of falling droplets are based on empirical data or complex mathematical approaches. This paper presents a new simple analytical approach to calculate selected properties of droplets, in particular the volume and frequency of falling droplets, out of [...] Read more.

Existing investigations to estimate different properties of falling droplets are based on empirical data or complex mathematical approaches. This paper presents a new simple analytical approach to calculate selected properties of droplets, in particular the volume and frequency of falling droplets, out of a thin vertical cylindrical capillary. The fluid-reservoir is located above the capillary and provides a constant flow into the droplet. This leads to drop formation times less than one second. The results of the calculation are validated by numerical simulations and experiments. Full article

(This article belongs to the Proceedings of Proceedings of Eurosensors 2017, Paris, France, 3–6 September 2017)

► Show Figures

Figure 1

5 pages, 2069 KiB

Open AccessProceeding Paper

High Precision Accelerometer with Integrated Thermal Sensor

by Beatrice Bourgeteau-Verlhac, Raphaël Lévy, Pierre Lavenus, Claude Chartier, Vincent Gaudineau and Olivier Le Traon

Proceedings 2017, 1(4), 285; https://doi.org/10.3390/proceedings1040285 - 24 Aug 2017

Cited by 1 | Viewed by 2656

Abstract

This paper investigates the design of a Vibrating Beam Accelerometer (VBA) with a resolution of 50 nano-g combined with an integrated thermal sensor. Despite quartz intrinsic thermal stability, the time delay between vibrating beam’s temperature and package’s temperature gives way to unwanted transient [...] Read more.

This paper investigates the design of a Vibrating Beam Accelerometer (VBA) with a resolution of 50 nano-g combined with an integrated thermal sensor. Despite quartz intrinsic thermal stability, the time delay between vibrating beam’s temperature and package’s temperature gives way to unwanted transient thermal behavior and thus bias instability. The aim of this study is to include a thermal sensor consisting in a torsional resonator directly at the center of the beam. Previous work demonstrated the feasibility of such integration on a tactical class accelerometer but also highlighted limitations like high motional resistance of the torsional resonator. Benefits of the in-situ temperature sensor are investigated thanks to finite element analysis of the accelerometer transient thermal behavior, which shall be compared to measurements on actual cells. Full article

(This article belongs to the Proceedings of Proceedings of Eurosensors 2017, Paris, France, 3–6 September 2017)

► Show Figures

Figure 1

5 pages, 1673 KiB

Open AccessProceeding Paper

Efficient Vertical-Cavity Mid-IR Thermal Radiation to Silicon-Slab Waveguide Coupling Using a Shallow Blazed Grating

by Gerald Pühringer and Bernhard Jakoby

Proceedings 2017, 1(4), 286; https://doi.org/10.3390/proceedings1040286 - 23 Aug 2017

Cited by 2 | Viewed by 2087

Abstract

In this work we investigate the coupling of radiation originating from a vertical-cavity enhanced thermal emitter (VERTE) into an optical waveguide, which can, for instance, act as a sensing element. We present full wave modelling results demonstrating highly efficient emitter-to-waveguide diffraction coupling at [...] Read more.

In this work we investigate the coupling of radiation originating from a vertical-cavity enhanced thermal emitter (VERTE) into an optical waveguide, which can, for instance, act as a sensing element. We present full wave modelling results demonstrating highly efficient emitter-to-waveguide diffraction coupling at multiple angles using the previously designed VERTE together with a shallow blazed grating. It is shown that the coherent and dispersive thermal emission of the VERTE concept is well suited to achieve highly efficient and integrated mode coupling in the mid IR region. Full article

(This article belongs to the Proceedings of Proceedings of Eurosensors 2017, Paris, France, 3–6 September 2017)

► Show Figures

Figure 1

4 pages, 5991 KiB

Open AccessProceeding Paper

Simulating Rain Droplets Influence on Distance Measurement with a Time-of-Flight Camera Sensor

by Marcus Baumgart, Markus Dielacher, Norbert Druml and Cristina Consani

Proceedings 2017, 1(4), 287; https://doi.org/10.3390/proceedings1040287 - 29 Aug 2017

Cited by 1 | Viewed by 2664

Abstract

Time-of-Flight (ToF) camera sensors measure simultaneously the light intensity and the scene distance on a pixel basis. Environmental effects, like rain droplets between the scene and the ToF camera, have an impact on the distance accuracy of the sensor. Optical raytracing simulations were [...] Read more.

Time-of-Flight (ToF) camera sensors measure simultaneously the light intensity and the scene distance on a pixel basis. Environmental effects, like rain droplets between the scene and the ToF camera, have an impact on the distance accuracy of the sensor. Optical raytracing simulations were performed to study rain influence in detail. The 3D simulation setup comprises all relevant elements including the sensor design, the object/scene geometry and a model for the environmental conditions. Specifically, a setup with small-angle ToF camera optics is investigated and a comparison of the influence of several typical rain intensities is presented. The simulation results serve as an input for developing error-compensation algorithms. Full article

(This article belongs to the Proceedings of Proceedings of Eurosensors 2017, Paris, France, 3–6 September 2017)

► Show Figures

Figure 1

4 pages, 852 KiB

Open AccessProceeding Paper

Towards Nanostructured ITO-Based Electrochemical Sensors: Fabrication, Characterization and Functionalization

by Raquel Pruna, Francisco Palacio and Manel López

Proceedings 2017, 1(4), 288; https://doi.org/10.3390/proceedings1040288 - 16 Aug 2017

Cited by 2 | Viewed by 2160

Abstract

The need for miniaturized, low-cost and ultrasensitive electrochemical sensors has motivated the search and study of new nanostructured materials. We propose nanostructured indium tin oxide (ITO) electrodes as a promising platform due to their good electrical conductivity, transparency to visible wavelengths and high [...] Read more.

The need for miniaturized, low-cost and ultrasensitive electrochemical sensors has motivated the search and study of new nanostructured materials. We propose nanostructured indium tin oxide (ITO) electrodes as a promising platform due to their good electrical conductivity, transparency to visible wavelengths and high surface-to-volume ratio. The nanostructured electrodes were fabricated by electron beam evaporation, and electrochemical techniques were used to quantify more than a 40% increase in electrochemical surface area compared to thin ITO films. The electrodes were derivatized with organosilanes and coated with a molecule providing redox activity. Indeed, an increase in detectability of more than 400% was observed with respect to thin films, indicating the potential viability of nanostructured ITO-based electrochemical biosensors. Full article

(This article belongs to the Proceedings of Proceedings of Eurosensors 2017, Paris, France, 3–6 September 2017)

► Show Figures

Figure 1

4 pages, 470 KiB

Open AccessProceeding Paper

Toward the Analysis of Mitochondria Isolated from Leukemic Cells with Electrochemically Instrumented Microwell Arrays

by Gabriel Lemercier, Fadhila Sekli-Belaïdi, Suresh Vajrala, Emeline Descamps, Julie Foncy, Stéphane Arbault, Jean-Emmanuel Sarry, Pierre Temple-Boyer and Jérôme Launay

Proceedings 2017, 1(4), 289; https://doi.org/10.3390/proceedings1040289 - 25 Aug 2017

Cited by 1 | Viewed by 1775

Abstract

This work deals with the development of electrochemical transducers for the analysis of the metabolic status of mitochondria isolated from leukemic cells. It proposes the use of ring nanoelectrodes (RNE) integrated into microwell arrays for the simultaneous monitoring of the oxygen (O₂ [...] Read more.

This work deals with the development of electrochemical transducers for the analysis of the metabolic status of mitochondria isolated from leukemic cells. It proposes the use of ring nanoelectrodes (RNE) integrated into microwell arrays for the simultaneous monitoring of the oxygen (O₂) consumption and the hydrogen peroxide (H₂O₂) production. The sensor enabled the real-time recording of the oxygen consumption of approximately 10,000 isolated mitochondria. Solutions are now proposed to detect H₂O₂ production and to reduce the number of mitochondria under test, targeting the single mitochondrion analysis. Full article

(This article belongs to the Proceedings of Proceedings of Eurosensors 2017, Paris, France, 3–6 September 2017)

► Show Figures

Figure 1

5 pages, 1430 KiB

Open AccessProceeding Paper

Fabrication of ZnO Nanorods on MEMS Piezoresistive Silicon Microcantilevers for Environmental Monitoring

by Jiushuai Xu, Maik Bertke, Alaaeldin Gad, Feng Yu, Gerry Hamdana, Andrey Bakin and Erwin Peiner

Proceedings 2017, 1(4), 290; https://doi.org/10.3390/proceedings1040290 - 16 Aug 2017

Cited by 14 | Viewed by 3658

Abstract

In this study, a ZnO nanorods (NRs) patterned MEMS piezoresistive silicon micro-cantilever was fabricated as environmental monitor. The fabrication starts from bulk silicon, utilizing photolithography, diffusion, inductively coupled plasma (ICP) cryogenic dry etching, Zinc DC-sputtering, and chemical bath deposition (CBD) etc. This sensor [...] Read more.

In this study, a ZnO nanorods (NRs) patterned MEMS piezoresistive silicon micro-cantilever was fabricated as environmental monitor. The fabrication starts from bulk silicon, utilizing photolithography, diffusion, inductively coupled plasma (ICP) cryogenic dry etching, Zinc DC-sputtering, and chemical bath deposition (CBD) etc. This sensor shows a humidity sensitivity value of 6.35 ± 0.27 ppm/RH% at 25 °C in the range from 30% RH to 80% RH. Full article

(This article belongs to the Proceedings of Proceedings of Eurosensors 2017, Paris, France, 3–6 September 2017)

► Show Figures

Figure 1

4 pages, 1025 KiB

Open AccessProceeding Paper

Single-Step CMOS Compatible Fabrication of High Aspect Ratio Microchannels Embedded in Silicon

by Marta Kluba, Aslihan Arslan, Ronald Stoute, James Muganda and Ronald Dekker

Proceedings 2017, 1(4), 291; https://doi.org/10.3390/proceedings1040291 - 11 Aug 2017

Cited by 6 | Viewed by 2539

Abstract

This paper presents a new method for the CMOS compatible fabrication of microchannels integrated into a silicon substrate. In a single-step DRIE process (Deep Reactive Ion Etching) a network of microchannels with High Aspect Ratio (HAR) up to 10, can be etched in [...] Read more.

This paper presents a new method for the CMOS compatible fabrication of microchannels integrated into a silicon substrate. In a single-step DRIE process (Deep Reactive Ion Etching) a network of microchannels with High Aspect Ratio (HAR) up to 10, can be etched in a silicon substrate through a mesh mask. In the same single etching step, multidimensional microchannels with various dimensions (width, length, and depth) can be obtained by tuning the process and design parameters. These fully embedded structures enable further wafer processing and integration of electronic components like sensors and actuators in wafers with microchannels. Full article

(This article belongs to the Proceedings of Proceedings of Eurosensors 2017, Paris, France, 3–6 September 2017)

► Show Figures

Figure 1

4 pages, 1067 KiB

Open AccessProceeding Paper

Formation of Crumpled Graphene for Flexible Strain Sensor

by Yinhua Jin, Atul Kulkarni, Hyeong-U Kim, Seokjun Hong and Taesung Kim

Proceedings 2017, 1(4), 292; https://doi.org/10.3390/proceedings1040292 - 21 Aug 2017

Cited by 3 | Viewed by 2465

Abstract

Studying the strain of materials on a small scale is very important for applications in strain sensors. Previous studies show that graphene is a promising candidate for strain sensors because of its extraordinary physical and electrical properties. However, these studies were limited to [...] Read more.

Studying the strain of materials on a small scale is very important for applications in strain sensors. Previous studies show that graphene is a promising candidate for strain sensors because of its extraordinary physical and electrical properties. However, these studies were limited to strain applied in a single direction. In this study, flexible strain sensors based on graphene were fabricated and evaluated for strain applied in two directions. For this, the CVD graphene was crumpled with the help of a pre-stretched silicone film. The preliminary results for applied strain in one direction by keeping a fixed strain in the other direction show a significant change in the resistance, up to 20 kΩ. Full article

(This article belongs to the Proceedings of Proceedings of Eurosensors 2017, Paris, France, 3–6 September 2017)

► Show Figures

Figure 1

4 pages, 1377 KiB

Open AccessProceeding Paper

Hierarchically Assembled Titania Based Nanostructures: Innovative and Efficient Strategies for the Synthesis and the Improvement of Sensing Properties

by Vardan Galstyan, Andrea Ponzoni, Iskandar Kholmanov, Elisabetta Comini, Veronica Sberveglieri, Nicola Poli and Giorgio Sberveglieri

Proceedings 2017, 1(4), 293; https://doi.org/10.3390/proceedings1040293 - 17 Aug 2017

Cited by 1 | Viewed by 1944

Abstract

We have developed innovative and efficient strategy for the preparation and improvement of sensing performance of well-ordered titania nanotubes. We have synthesized different materials based on titania nanotubes using cost-effective techniques. The morphological and structural analyses of the prepared materials have been carried [...] Read more.

We have developed innovative and efficient strategy for the preparation and improvement of sensing performance of well-ordered titania nanotubes. We have synthesized different materials based on titania nanotubes using cost-effective techniques. The morphological and structural analyses of the prepared materials have been carried out. The sensing properties of the structures have been studied towards NO₂. Investigations have shown the functionalization process has crucial effect on sensing properties of titania nanotubes. The obtained results demonstrate that the prepared structures are promising for the potential applications in the area of chemical sensors for the environmental monitoring. Full article

(This article belongs to the Proceedings of Proceedings of Eurosensors 2017, Paris, France, 3–6 September 2017)

► Show Figures

Figure 1

4 pages, 588 KiB

Open AccessProceeding Paper

VO₂: A Phase Change Material for Micromechanics

by Nicola Manca, Luca Pellegrino, Teruo Kanki, Warner J. Venstra, Giordano Mattoni, Yoshiyuki Higuchi, Hidekazu Tanaka, Andrea D. Caviglia and Daniele Marré

Proceedings 2017, 1(4), 294; https://doi.org/10.3390/proceedings1040294 - 11 Aug 2017

Cited by 1 | Viewed by 3212

Abstract

Micro- and nano-mechanical systems may take advantage from using materials having multiple functional characteristics. VO₂is a compound characterised by a solid state phase transition (SSPT) just above room temperature, consisting in a concurrent metal-insulator transition and a change of lattice symmetry [...] Read more.

Micro- and nano-mechanical systems may take advantage from using materials having multiple functional characteristics. VO₂is a compound characterised by a solid state phase transition (SSPT) just above room temperature, consisting in a concurrent metal-insulator transition and a change of lattice symmetry and parameters. Here, the combination of non-linear electrical response and structural changes is employed to realise a novel high-frequency mechanical actuation scheme, showing direct conversion from DC voltage to mechanical excitation in the MHz range and selective activation of the different mechanical modes of a microstructure. Full article

(This article belongs to the Proceedings of Proceedings of Eurosensors 2017, Paris, France, 3–6 September 2017)

► Show Figures

Figure 1

5 pages, 1056 KiB

Open AccessProceeding Paper

Silicon Sacrificial Layer Technology for the Production of 3D MEMS (EPyC Process)

by Latifa Louriki, Peter Staffeld, Arnd Kaelberer and Thomas Otto

Proceedings 2017, 1(4), 295; https://doi.org/10.3390/proceedings1040295 - 11 Aug 2017

Cited by 2 | Viewed by 2981

Abstract

The EPyC process uses silicon sacrificial layer technology, which makes it possible to generate high volume sacrificial structures of up to 100 microns thickness. The biggest challenge is the rapid and complete removal of the 3D sacrificial structure at the end of the [...] Read more.

The EPyC process uses silicon sacrificial layer technology, which makes it possible to generate high volume sacrificial structures of up to 100 microns thickness. The biggest challenge is the rapid and complete removal of the 3D sacrificial structure at the end of the process. This paper examines and compares in detail two silicon dry etching methods to optimize a new silicon etching process for successful EPyC manufacturing Full article

(This article belongs to the Proceedings of Proceedings of Eurosensors 2017, Paris, France, 3–6 September 2017)

► Show Figures

Figure 1

4 pages, 814 KiB

Open AccessProceeding Paper

Multilayer Micromechanics Process with Thick Functional Layers (EPyC40)

by Latifa Louriki, Peter Staffeld, Arnd Kaelberer and Thomas Otto

Proceedings 2017, 1(4), 296; https://doi.org/10.3390/proceedings1040296 - 17 Aug 2017

Viewed by 2411

Abstract

The EPyC process (Epi-Poly-Cycle) (by Robert Bosch GmbH) opens up unique opportunities for manufacturing complex 3D MEMS structures having high effectiveness in small space. EPyC40 is an EPyC process with up to 40 μm thick polysilicon layers and sacrificial silicon technique. For successful [...] Read more.

The EPyC process (Epi-Poly-Cycle) (by Robert Bosch GmbH) opens up unique opportunities for manufacturing complex 3D MEMS structures having high effectiveness in small space. EPyC40 is an EPyC process with up to 40 μm thick polysilicon layers and sacrificial silicon technique. For successful manufacturing a 40 μm EPyC the epitaxial polysilicon layer must be electrically and mechanically optimized. A vertical deep trench patterns the functional and sacrificial areas. A passivation must be deposited homogeneously and has to be tight and robust towards silicon-etching gases. For more than one cycle it is necessary to tailor the layer stress of the epitaxial polysilicon and the wafer-bow. The full process for stacking up 5 EPyC cycles with two 40 μm epitaxial polysilicon layers was investigated in detail. A true 3D MEMS device providing high z deflection by use of a vertical comb drive with 40 μm electrodes was built up successfully to prove the feasibility of the EPyC process. Full article

(This article belongs to the Proceedings of Proceedings of Eurosensors 2017, Paris, France, 3–6 September 2017)

► Show Figures

Figure 1

4 pages, 1330 KiB

Open AccessProceeding Paper

Porous Silicon Carbide for MEMS

by Markus Leitgeb, Christopher Zellner, Georg Pfusterschmied, Michael Schneider and Ulrich Schmid

Proceedings 2017, 1(4), 297; https://doi.org/10.3390/proceedings1040297 - 30 Aug 2017

Cited by 1 | Viewed by 3317

Abstract

Metal assisted photochemical etching (MAPCE) of 4H Silicon Carbide (SiC) was utilized to generate locally defined porous areas on single crystalline substrates. Therefore, Platinum (Pt) was sputter deposited on 4H-SiC substrates and patterned with photolithography and lift off. Etching was performed by immersing [...] Read more.

Metal assisted photochemical etching (MAPCE) of 4H Silicon Carbide (SiC) was utilized to generate locally defined porous areas on single crystalline substrates. Therefore, Platinum (Pt) was sputter deposited on 4H-SiC substrates and patterned with photolithography and lift off. Etching was performed by immersing the Pt coated samples into an etching solution containing sodium persulphate and hydrofluoric acid. UV light irradiation was necessary for charge carrier generation while the Pt served as local cathode. The generated porous areas can be used for the generation of integrated cavities in the single crystalline SiC substrates when covered with a chemical vapor deposited thin film of poly-crystalline SiC. Full article

(This article belongs to the Proceedings of Proceedings of Eurosensors 2017, Paris, France, 3–6 September 2017)

► Show Figures

Figure 1

4 pages, 593 KiB

Open AccessProceeding Paper

Integration of Silica Aerogels in Microfluidic Chips

by Sina Reede, Frank Bunge and Michael J. Vellekoop

Proceedings 2017, 1(4), 298; https://doi.org/10.3390/proceedings1040298 - 9 Aug 2017

Cited by 4 | Viewed by 2477

Abstract

This paper reports a method to integrate silica aerogels monolithically in microfluidic chips. Silica Aerogel is a highly porous bulk material. The gel was synthesized from tetraethyl orthosilicate by a sol-gel process. Polyethylene glycol and an extended aging period were used to strengthen [...] Read more.

This paper reports a method to integrate silica aerogels monolithically in microfluidic chips. Silica Aerogel is a highly porous bulk material. The gel was synthesized from tetraethyl orthosilicate by a sol-gel process. Polyethylene glycol and an extended aging period were used to strengthen the matrix minimizing gel shrinkage. This technique allows alcogel structures with high strength and stiffness that withstand high pressure during the subcritical drying process. Hexamethyldisilazane provides for hydrophobizing and prevents the formation of siloxane bonds during the drying process. The resulting transparent aerogels reach porosities of 85%, pore diameters around 50 nm and contact angles of 136°. Full article

(This article belongs to the Proceedings of Proceedings of Eurosensors 2017, Paris, France, 3–6 September 2017)

► Show Figures

Figure 1

4 pages, 604 KiB

Open AccessProceeding Paper

A Simple Method to Allow Parylene-C Coatings on Gold Substrates

by Sander van den Driesche, Christian Habben, Andre Bödecker, Walter Lang and Michael J. Vellekoop

Proceedings 2017, 1(4), 299; https://doi.org/10.3390/proceedings1040299 - 23 Aug 2017

Cited by 3 | Viewed by 3766

Abstract

Parylene-C, a biocompatible coating material, does not adhere well to metals. This is problematic especially for biomedical devices containing gold structures. In this contribution, we present a simple method to adhere Parylene-C to gold-coated substrates based on thiol-based adhesion promoters. The effectiveness of [...] Read more.

Parylene-C, a biocompatible coating material, does not adhere well to metals. This is problematic especially for biomedical devices containing gold structures. In this contribution, we present a simple method to adhere Parylene-C to gold-coated substrates based on thiol-based adhesion promoters. The effectiveness of the adhesion promoters has been demonstrated by pull-tests on autoclaved Parylene-C coated gold-substrates. Full article

(This article belongs to the Proceedings of Proceedings of Eurosensors 2017, Paris, France, 3–6 September 2017)

► Show Figures

Figure 1

4 pages, 871 KiB

Open AccessProceeding Paper

Driving and Sensing M/NEMS Flexural Vibration Using Dielectric Transduction

by Cécile Fuinel, Fabrice Mathieu and Bernard Legrand

Proceedings 2017, 1(4), 300; https://doi.org/10.3390/proceedings1040300 - 25 Aug 2017

Viewed by 1856

Abstract

We show that nanometer-scale dielectric thin films can act as efficient electromechanical transducers to simultaneously drive and sense the vibration of the first flexural mode of micro/nano-cantilevers. Here, 16 μm-long, 5 μm-wide and 350 nm-thick cantilevers are actuated by a 15 nm-thick silicon [...] Read more.

We show that nanometer-scale dielectric thin films can act as efficient electromechanical transducers to simultaneously drive and sense the vibration of the first flexural mode of micro/nano-cantilevers. Here, 16 μm-long, 5 μm-wide and 350 nm-thick cantilevers are actuated by a 15 nm-thick silicon nitride layer, and electrically detected by charge measurement at megahertz frequencies. The displacement was also checked by optical interferometry, and the electromechanical transduction efficiency is extracted and compared to an analytical modelling. Full article

(This article belongs to the Proceedings of Proceedings of Eurosensors 2017, Paris, France, 3–6 September 2017)

► Show Figures

Figure 1

4 pages, 1474 KiB

Open AccessProceeding Paper

Electrostatically Actuated Membranes of Cross-Linked Gold Nanoparticles: Novel Concepts for Electromechanical Gas Sensors

by Hendrik Schlicke, Sophia C. Bittinger, Malte Behrens, Mazlum Yesilmen, Hauke Hartmann, Clemens J. Schröter, Gregor T. Dahl and Tobias Vossmeyer

Proceedings 2017, 1(4), 301; https://doi.org/10.3390/proceedings1040301 - 29 Aug 2017

Cited by 4 | Viewed by 2391

Abstract

We report the preparation of freestanding membranes of cross-linked gold nanoparticles (GNPs) and demonstrate their application as electromechanical sensors for volatile organic compounds (VOCs). First, we show that the fundamental vibrational mode frequency of electrostatically excited GNP-membranes shifts significantly when exposing them to [...] Read more.

We report the preparation of freestanding membranes of cross-linked gold nanoparticles (GNPs) and demonstrate their application as electromechanical sensors for volatile organic compounds (VOCs). First, we show that the fundamental vibrational mode frequency of electrostatically excited GNP-membranes shifts significantly when exposing them to solvent vapors. We attribute this effect mainly to the reduction of the membranes’ pre-stress. Second, the relief in pre-stress upon analyte sorption can also be detected via quasi-static actuation of the membranes. In this case, the increase of the deflection amplitudes at constant bias voltages can be measured as the sensor signal and correlated to the analyte’s concentration. Additionally, we propose a facile route to the fabrication of such hybrid MEMS/NEMS sensors using layer-by-layer spin-coating and contact printing. Full article

(This article belongs to the Proceedings of Proceedings of Eurosensors 2017, Paris, France, 3–6 September 2017)

► Show Figures

Figure 1

4 pages, 1609 KiB

Open AccessProceeding Paper

Microfabrication of Embedding a Flexible Parylene-Based Microelectrode Array within Body-on-a-Chip

by Tatsuya Omaki, Yoshikazu Hirai, Ken-ichiro Kamei, Toshiyuki Tsuchiya and Osamu Tabata

Proceedings 2017, 1(4), 302; https://doi.org/10.3390/proceedings1040302 - 24 Aug 2017

Cited by 2 | Viewed by 2412

Abstract

To study drug response on human heart cells and predict drug induced cardiotoxicity, a microfluidic cell culture device with an integrated microelectrode array (MEA) is a promising approach. Here we integrate flexible MEA into microengineered and microfluidic in vitro human models, known as [...] Read more.

To study drug response on human heart cells and predict drug induced cardiotoxicity, a microfluidic cell culture device with an integrated microelectrode array (MEA) is a promising approach. Here we integrate flexible MEA into microengineered and microfluidic in vitro human models, known as “Body-on-a-Chip”, during its fabrication. In this work, Au electrodes are covered by two layers of parylene C films, and then embedded in a polydimethylsiloxane (PDMS) layer, resulting in an easy-to-integrate process and compatible with soft-lithography. For a proof of fabrication concept, the impedance of individual electrode-electrolyte interfaces are measured to show a potential for network electrophysiology. Full article

(This article belongs to the Proceedings of Proceedings of Eurosensors 2017, Paris, France, 3–6 September 2017)

► Show Figures

Figure 1

6 pages, 1432 KiB

Open AccessProceeding Paper

Cu Thin Film Polyimide Heater for Nerve-Net Tactile Sensor

by Yusuke Suganuma, Minoru Sasaki, Takahiro Nakayama, Masanori Muroyama and Yutaka Nonomura

Proceedings 2017, 1(4), 303; https://doi.org/10.3390/proceedings1040303 - 11 Aug 2017

Cited by 3 | Viewed by 2158

Abstract

Tactile sensing is required for assistant robots. A new stacked sensor head was proposed which detects forces and thermal sensations with a nerve-net LSI chip. To measure temperatures and heat flows, the sensor head required a thin and small heater to heat up [...] Read more.

Tactile sensing is required for assistant robots. A new stacked sensor head was proposed which detects forces and thermal sensations with a nerve-net LSI chip. To measure temperatures and heat flows, the sensor head required a thin and small heater to heat up the sensor head. The features of the polyimide heater are compact, low heat capacity, low power consumption and ease of attaching it to the LSI chip. The polyimide heater consisted of Au 10 nm/Cu 200 nm/Cr 20 nm thickness layers on a polyimide film. The surface of the sensor head heated up to 60 °C by the polyimide heater with 0.3 W. By the Cu thin film polyimide heater, the small stacked sensor head with the nerve-net LSI chip is enable to detect forces, temperatures, and heat flows, simultaneously. Full article

(This article belongs to the Proceedings of Proceedings of Eurosensors 2017, Paris, France, 3–6 September 2017)

► Show Figures

Figure 1

5 pages, 1392 KiB

Open AccessProceeding Paper

Fabrication of Sharp Tip-Separable Microneedle Device for Trans-Dermal Drug Delivery Systems

by Yuki Nabekura, Hitoshi Fukuyu, Yoshihiro Hasegawa and Mitsuhiro Shikida

Proceedings 2017, 1(4), 304; https://doi.org/10.3390/proceedings1040304 - 17 Aug 2017

Cited by 2 | Viewed by 2406

Abstract

An alignment mechanism for producing a sharp tip-separable microneedle device for trans-dermal drug delivery systems has been developed. The needle and base parts were placed on a mechanical precision motion stage to align their central axes. The overlapping region between them in the [...] Read more.

An alignment mechanism for producing a sharp tip-separable microneedle device for trans-dermal drug delivery systems has been developed. The needle and base parts were placed on a mechanical precision motion stage to align their central axes. The overlapping region between them in the height direction was controlled by inserting a thickness gauge between them. A 400-μm-high sharp tip-separable microneedle device was successfully produced by using the developed alignment mechanism with an accuracy of less than 19 μm. We also demonstrated that it can be used to produce an arrayed tip-separable microneedle device. Full article

(This article belongs to the Proceedings of Proceedings of Eurosensors 2017, Paris, France, 3–6 September 2017)

► Show Figures

Figure 1

4 pages, 309 KiB

Open AccessProceeding Paper

Scandium Aluminium Nitride-Based Film Bulk Acoustic Resonators

by Michael Schneider, Mario DeMiguel-Ramos, Andrew J. Flewitt, Enrique Iborra and Ulrich Schmid

Proceedings 2017, 1(4), 305; https://doi.org/10.3390/proceedings1040305 - 18 Aug 2017

Cited by 36 | Viewed by 4944

Abstract

Film bulk acoustic resonators (FBAR) are promising candidates to replace surface acoustic wave devices as filters or delay lines, but also offer exciting opportunities as biological or gas sensors. In this work, solidly mounted FBARs were manufactured by substituting commonly used pure aluminium [...] Read more.

Film bulk acoustic resonators (FBAR) are promising candidates to replace surface acoustic wave devices as filters or delay lines, but also offer exciting opportunities as biological or gas sensors. In this work, solidly mounted FBARs were manufactured by substituting commonly used pure aluminium nitride (AlN) by scandium doped aluminium nitride (ScAlN) thin films as the piezoelectric layer. The ScAlN-based resonators feature a significant improvement of the electromechanical coupling factor from ~3% to ~12% compared to the pure AlN, while the decreased stiffness of ScAlN results in a decrease of the quality factor from ~300 to ~100 due to increased damping losses in the piezoelectric material. Full article

(This article belongs to the Proceedings of Proceedings of Eurosensors 2017, Paris, France, 3–6 September 2017)

► Show Figures

Figure 1

4 pages, 523 KiB

Open AccessProceeding Paper

Segmented Control of Electrostatically Actuated Bimorph Beams

by Kullen Waggoner, Robert Lake, Lavern Starman and John Walton

Proceedings 2017, 1(4), 306; https://doi.org/10.3390/proceedings1040306 - 25 Aug 2017

Viewed by 1772

Abstract

This research focused on improving the control and sensing of electrostatically actuated, large deflection bimorph beams for optical beam steering. Current iterations of designs utilize a ‘zipper’ beam and have demonstrated large deflection angles. However, with these devices precise control and deflection measurements [...] Read more.

This research focused on improving the control and sensing of electrostatically actuated, large deflection bimorph beams for optical beam steering. Current iterations of designs utilize a ‘zipper’ beam and have demonstrated large deflection angles. However, with these devices precise control and deflection measurements can be difficult to achieve. Through using segmented bias channels of doped polysilicon, modeling shows it is possible to control and measure different segments of the actuation arm, thus controlling the amount of tip, tilt, or piston deflection. This paper discusses current and future designs, along with test procedures and modeling results. Full article

(This article belongs to the Proceedings of Proceedings of Eurosensors 2017, Paris, France, 3–6 September 2017)

► Show Figures

Figure 1

5 pages, 408 KiB

Open AccessProceeding Paper

Novel Method for Adhesion between PI-PDMS Using Butyl Rubber for Large Area Flexible Body Patches

by Shivani Joshi, Rishab Bagani, Lucas Beckers and Ronald Dekker

Proceedings 2017, 1(4), 307; https://doi.org/10.3390/proceedings1040307 - 7 Aug 2017

Cited by 2 | Viewed by 2414

Abstract

This paper reports the use of rubber—Polybutadiene as an intermediate adhesive layer for improving the adhesion between polyimide (PI) and silicone polydimethylsiloxane (PDMS) which is required for a reliable fabrication of flexible/stretchable body patches for various applications. The adhesive bond initiated by the [...] Read more.

This paper reports the use of rubber—Polybutadiene as an intermediate adhesive layer for improving the adhesion between polyimide (PI) and silicone polydimethylsiloxane (PDMS) which is required for a reliable fabrication of flexible/stretchable body patches for various applications. The adhesive bond initiated by the butyl rubber (BR), apart from being extremely strong, is also chemically resistant and mechanically stable as compared to the state of the art processes of improving adhesion between PI and Silicone. Full article

(This article belongs to the Proceedings of Proceedings of Eurosensors 2017, Paris, France, 3–6 September 2017)

► Show Figures

Figure 1

4 pages, 926 KiB

Open AccessProceeding Paper

Incorporation of ZnO Nanostructures in MIS Architecture through Chemical Routes

by Rubén J. Aranda García, A. Escobedo Morales, J. Carrillo López, M. Dominguez Jimenez, N. Carlos Ramírez and José Alberto Luna López

Proceedings 2017, 1(4), 308; https://doi.org/10.3390/proceedings1040308 - 18 Aug 2017

Viewed by 2130

Abstract

Because it’s physical properties, ZnO is considered a potential semiconductor compound for fabricating electronic and optoelectronic functional devices. In this regard, several growth techniques have been developed in order to meet the requirements of commercial devices based in this material. On the pathway [...] Read more.

Because it’s physical properties, ZnO is considered a potential semiconductor compound for fabricating electronic and optoelectronic functional devices. In this regard, several growth techniques have been developed in order to meet the requirements of commercial devices based in this material. On the pathway for improving the performance of the current devices, low-dimensional ZnO structures seem a promising alternative. Here, we report the process to obtain a metal-insulator-semiconductor (MIS) structure based on ZnO nanostructures grown on the surface of an anodized aluminum substrate (Al₂O₃/Al) by chemical routes. Full article

(This article belongs to the Proceedings of Proceedings of Eurosensors 2017, Paris, France, 3–6 September 2017)

► Show Figures

Figure 1

5 pages, 583 KiB

Open AccessProceeding Paper

Nanofabrication of Vertically Aligned 3D GaN Nanowire Arrays with Sub-50 nm Feature Sizes Using Nanosphere Lift-off Lithography

by Tony Granz, Shinta Mariana, Gerry Hamdana, Feng Yu, Muhammad Fahlesa Fatahilah, Irene Manglano Clavero, Prabowo Puranto, Zhi Li, Uwe Brand, Joan Daniel Prades, Erwin Peiner, Andreas Waag and Hutomo Suryo Wasisto

Proceedings 2017, 1(4), 309; https://doi.org/10.3390/proceedings1040309 - 8 Aug 2017

Cited by 6 | Viewed by 3155

Abstract

Vertically aligned 3D gallium nitride (GaN) nanowire arrays with sub-50 nm feature sizes were fabricated using a nanosphere lift-off lithography (NSLL) technique combined with hybrid top-down etching steps (i.e., inductively coupled plasma dry reactive ion etching (ICP-DRIE) and wet chemical etching). Owing to [...] Read more.

Vertically aligned 3D gallium nitride (GaN) nanowire arrays with sub-50 nm feature sizes were fabricated using a nanosphere lift-off lithography (NSLL) technique combined with hybrid top-down etching steps (i.e., inductively coupled plasma dry reactive ion etching (ICP-DRIE) and wet chemical etching). Owing to the well-controlled chemical surface treatment prior to the nanobead deposition and etching process, vertical GaN nanowire arrays with diameter of ~35 nm, pitch of ~350 nm, and aspect ratio of >10 could be realized using 500 nm polystyrene nanobead (PN) masks. This work has demonstrated a feasibility of using NSLL as an alternative for other sophisticated but expensive nanolithography methods to manufacture low-cost but highly ordered 3D GaN nanostructures. Full article

(This article belongs to the Proceedings of Proceedings of Eurosensors 2017, Paris, France, 3–6 September 2017)

► Show Figures

Figure 1

5 pages, 451 KiB

Open AccessProceeding Paper

Thermal Stability of Micro-Structured PDMS Piezo-Electrets under Various Polymeric Reticulation Ratios for Sensor Applications

by Achraf Kachroudi, Skandar Basrour and Alain Sylvestre

Proceedings 2017, 1(4), 310; https://doi.org/10.3390/proceedings1040310 - 21 Aug 2017

Cited by 2 | Viewed by 2185

Abstract

The effect of the polymeric reticulation on the thermal stability of the piezoelectricity of a micro-structured PDMS piezo-electret was investigated. This new family of flexible piezoelectric materials with very low Young’s modulus is used for wearable sensors and energy harvester devices. The best [...] Read more.

The effect of the polymeric reticulation on the thermal stability of the piezoelectricity of a micro-structured PDMS piezo-electret was investigated. This new family of flexible piezoelectric materials with very low Young’s modulus is used for wearable sensors and energy harvester devices. The best thermal stability was obtained for the piezo-electret material made from the ratio 1:10 between the prepolymer and the crosslinking agent with a longitudinal piezoelectric coefficient d₃₃ = 350 pC/N. The highest piezoelectric coefficient d₃₃ = 750 pC/N was obtained for the ratio 1:20, but the piezoelectricity was lost at 45 °C by thermally stimulated discharge Full article

(This article belongs to the Proceedings of Proceedings of Eurosensors 2017, Paris, France, 3–6 September 2017)

► Show Figures

Figure 1

5 pages, 691 KiB

Open AccessProceeding Paper

Thermoelectric Measurement of a Single, TiO₂-Catalyzed Bi₂Te₃ Nanowire

by S. Hoda Moosavi, Danny Kojda, Maximilian Kockert, Piet Schoenherr, Thorsten Hesjedal, Saskia F. Fischer, Michael Kroener and Peter Woias

Proceedings 2017, 1(4), 311; https://doi.org/10.3390/proceedings1040311 - 24 Aug 2017

Cited by 2 | Viewed by 1935

Abstract

We report on the functionality of our Thermoelectric Nanowire Characterization Platform (TNCP). As a proof of concept of our design, we present a set of experimental results obtained from the characterization of a single Bi₂Te₃ nanowire, allowing for the determination [...] Read more.

We report on the functionality of our Thermoelectric Nanowire Characterization Platform (TNCP). As a proof of concept of our design, we present a set of experimental results obtained from the characterization of a single Bi₂Te₃ nanowire, allowing for the determination of the nanowire’s electrical conductivity and Seebeck coefficient. Full article

(This article belongs to the Proceedings of Proceedings of Eurosensors 2017, Paris, France, 3–6 September 2017)

► Show Figures

Figure 1

5 pages, 762 KiB

Open AccessProceeding Paper

On the Development of Label-Free DNA Sensor Using Silicon Nanonet Field-Effect Transistors

by Thi Thu Thuy Nguyen, Maxime Legallais, Fanny Morisot, Thibauld Cazimajou, Mireille Mouis, Bassem Salem, Valérie Stambouli and Céline Ternon

Proceedings 2017, 1(4), 312; https://doi.org/10.3390/proceedings1040312 - 28 Aug 2017

Cited by 4 | Viewed by 2365

Abstract

In this paper, the process and electrical characteristics of DNA sensor devices based on silicon nanonet (SiNN) field-effect transistors are reported. The SiNN, another name of randomly oriented Si nanowires network, was successfully integrated into transistor as p-type channel using standard microelectronic technology. [...] Read more.

In this paper, the process and electrical characteristics of DNA sensor devices based on silicon nanonet (SiNN) field-effect transistors are reported. The SiNN, another name of randomly oriented Si nanowires network, was successfully integrated into transistor as p-type channel using standard microelectronic technology. The SiNN-based transistors exhibit a high initial ON-state current (5.10⁻⁸A) and homogeneous electrical characteristics. For DNA detection, a new and eco-friendly functionalization process based on glycidyloxypropyltrimethoxysilane (GOPS) was performed which enables the covalent grafting of DNA probes on SiNN. This hybridization leads to a significant decrease of ON-state current of device. Additionally, it is observed that SiNN devices reveal reproductive current response to DNA detection. We demonstrate, for the first time, the successful integration of SiNN into sensor for electrical label-free DNA detection at low cost. Full article

(This article belongs to the Proceedings of Proceedings of Eurosensors 2017, Paris, France, 3–6 September 2017)

► Show Figures

Figure 1

5 pages, 1756 KiB

Open AccessProceeding Paper

Particle Separation with Deterministic Lateral Displacement (DLD): The Anisotropy Effect

by Eloise Pariset, Jean Berthier, Catherine Pudda, Fabrice Navarro, Béatrice Icard and Vincent Agache

Proceedings 2017, 1(4), 313; https://doi.org/10.3390/proceedings1040313 - 18 Aug 2017

Cited by 3 | Viewed by 3513

Abstract

Deterministic lateral displacement (DLD) is a passive and label-free microfluidic separation technique with a strong potential for biological sample preparation purposes. Numerical and experimental models have been proposed so far to predict the particle behavior in DLD channels. However, they do not take [...] Read more.

Deterministic lateral displacement (DLD) is a passive and label-free microfluidic separation technique with a strong potential for biological sample preparation purposes. Numerical and experimental models have been proposed so far to predict the particle behavior in DLD channels. However, they do not take into account the influence of the pillar anisotropy that induces a secondary pressure gradient in the direction perpendicular to the main flow. The influence of the pillar geometry on the anisotropy magnitude is presented. We show that anisotropy impacts the trajectory of particles in DLD devices and should be included in predictive models for the critical diameter. Full article

(This article belongs to the Proceedings of Proceedings of Eurosensors 2017, Paris, France, 3–6 September 2017)

► Show Figures

Figure 1

4 pages, 1009 KiB

Open AccessProceeding Paper

Ionogel—Based Composite Material for CO₂ Sensing Deposited on a Chemiresistive Transducer

by Bora Ersoez, Marie-Luise Bauersfeld and Jürgen Wöllenstein

Proceedings 2017, 1(4), 314; https://doi.org/10.3390/proceedings1040314 - 17 Aug 2017

Cited by 4 | Viewed by 2508

Abstract

A novel miniaturized carbon dioxide (CO₂) sensor based on an IDE transducer is described and characterized. The CO₂ sensor based on different semiconducting metal oxide and ionogel composites films deposited by ink-jet printing. The sensor is operated as a simple [...] Read more.

A novel miniaturized carbon dioxide (CO₂) sensor based on an IDE transducer is described and characterized. The CO₂ sensor based on different semiconducting metal oxide and ionogel composites films deposited by ink-jet printing. The sensor is operated as a simple chemiresistor. The sensors were investigated under trace gas exposure (CO₂, NO₂, CO and humidity). The CO₂ sensitivity is found to be exceptionally high and the sensing mechanism is supposed to be entirely different compared to those of the components of the composite. Full article

(This article belongs to the Proceedings of Proceedings of Eurosensors 2017, Paris, France, 3–6 September 2017)

► Show Figures

Figure 1

5 pages, 608 KiB

Open AccessProceeding Paper

Protuberant Electrode Structures for New Retinal Implants

by Pedro González Losada, Lionel Rousseau, Marjorie Grzeskowiak, Julie Degardin, Sarah Berhanu, Elisabeth Dubus, Serge Picaud and Gaëlle Lissorgues

Proceedings 2017, 1(4), 315; https://doi.org/10.3390/proceedings1040315 - 9 Aug 2017

Cited by 1 | Viewed by 1994

Abstract

Focal stimulation of neural tissue is a challenge in retinal prosthetic devices in which the aim is to improve the spatial resolution of the stimulation and therefore increase the electrode density of the prosthetic devices. Our work intends to create a new implant [...] Read more.

Focal stimulation of neural tissue is a challenge in retinal prosthetic devices in which the aim is to improve the spatial resolution of the stimulation and therefore increase the electrode density of the prosthetic devices. Our work intends to create a new implant able to enhance the focalisation of the stimulation signal through protuberant electrodes. These electrodes are micro fabricated on a soft polyimide substrate using classical metal electrodeposition techniques. Before proceeding with fabrication a FEM model of the electrode’s current density was done to select the best-performing structures and geometries in terms of local stimulation. Based on these models, several prototypes were fabricated and implanted in vivo into a rat’s eye to verify the adaptation to the retina tissue. Full article

(This article belongs to the Proceedings of Proceedings of Eurosensors 2017, Paris, France, 3–6 September 2017)

► Show Figures

Figure 1

5 pages, 814 KiB

Open AccessProceeding Paper

Aerosol Jet Printing of Miniaturized, Low Power Flexible Micro-Hotplates

by Saleem Khan, Tran Phong Nguyen, Laurent Thiery, Pascal Vairac and Danick Briand

Proceedings 2017, 1(4), 316; https://doi.org/10.3390/proceedings1040316 - 17 Aug 2017

Cited by 5 | Viewed by 3010

Abstract

We report on printed flexible micro-hotplates operating at high temperature at lower power consμmption than ever reported using aerosol jet printing of fine metallic conductor features. Efficient heating (i.e., 40 mW at 325 °C) was produced by reducing the effective heating area and [...] Read more.

We report on printed flexible micro-hotplates operating at high temperature at lower power consμmption than ever reported using aerosol jet printing of fine metallic conductor features. Efficient heating (i.e., 40 mW at 325 °C) was produced by reducing the effective heating area and substrates thickness. Gold (Au) nanoparticles solution was used for printing micro-hotplates of two different sizes, i.e., 500 × 500 μm² and 300 × 300 μm², on 50 μm- and 13 μm-thick PI substrates, respectively. Comsol simulations were used to optimize the thermal design of micro-hotplates. Their power consμmption at 325 °C was of 54 mW for the large hotplate and of 40 mW for the smaller design. These results validate the simple manufacturing of high temperature and power efficient flexible micro-hotplates for applications such as in portable gas and chemical sensors, thermal metrology, etc. Full article

(This article belongs to the Proceedings of Proceedings of Eurosensors 2017, Paris, France, 3–6 September 2017)

► Show Figures

Figure 1

4 pages, 479 KiB

Open AccessProceeding Paper

Repeated Temperature and Humidity Stability of SERS-active Periodical Silver Nanostructure

by Oleksiy Lyutakov, Y. Kalachyova and V. Svorcik

Proceedings 2017, 1(4), 317; https://doi.org/10.3390/proceedings1040317 - 8 Aug 2017

Viewed by 1778

Abstract

In this work the effect of physical aging on the plasmonic properties of surface plasmon-polariton supported silver grating was studied. As physical treatment the periodical variation of external temperature, humidity and their combination was applied. It was previously expected, that the physical aging [...] Read more.

In this work the effect of physical aging on the plasmonic properties of surface plasmon-polariton supported silver grating was studied. As physical treatment the periodical variation of external temperature, humidity and their combination was applied. It was previously expected, that the physical aging will results in the silver oxidation, redistribution, and potential worse of plasmonic properties. The oxidation processes were studied using the XPS technique, the changes of surface morphology were examined by AFM, and finally, the shift of plasmonic efficiency was checked using the SERS test. Full article

(This article belongs to the Proceedings of Proceedings of Eurosensors 2017, Paris, France, 3–6 September 2017)

► Show Figures

Figure 1

3 pages, 2076 KiB

Open AccessProceeding Paper

Layer by Layer Deposition of Colloidal SnO₂ Nano Particles

by Haitao Gao, Xuemeng Lyu, Jürgen Wöllenstein and Stefan Palzer

Proceedings 2017, 1(4), 318; https://doi.org/10.3390/proceedings1040318 - 22 Aug 2017

Viewed by 2544

Abstract

The gas sensing properties of functional metal oxide layers depend on multitude parameters, including vacancy concentration, layer morphology and thickness, size and shape of the nano/microstructure, and porosity. Using colloidal tin oxide inks we demonstrate a layer by layer deposition technique to control [...] Read more.

The gas sensing properties of functional metal oxide layers depend on multitude parameters, including vacancy concentration, layer morphology and thickness, size and shape of the nano/microstructure, and porosity. Using colloidal tin oxide inks we demonstrate a layer by layer deposition technique to control the thickness and composition of gas sensitive layers. To do this we combine inkjet-printing with colloidal suspensions of SnO₂ particles to provide a scalable method to interface microelectromechanical systems (MEMS) with nano particles. The approach may pave the way towards an industry ready integration technique to incorporate gas sensitive quantum dots or hybrid nanomaterials in arbitrary sensing devices. Full article

(This article belongs to the Proceedings of Proceedings of Eurosensors 2017, Paris, France, 3–6 September 2017)

► Show Figures

Figure 1

4 pages, 265 KiB

Open AccessProceeding Paper

Near Infrared Plasmonic Gas Sensing with Doped Metal Oxide Nanocrystals

by Marco Sturaro, Enrico Della Gaspera, Carlo Cantalini, Massimo Guglielmi and Alessandro Martucci

Proceedings 2017, 1(4), 319; https://doi.org/10.3390/proceedings1040319 - 5 Sep 2017

Cited by 3 | Viewed by 2193

Abstract

In this paper, we demonstrate the application of ZnO doped with gallium (GZO), aluminum (AZO) and germanium (GeZO) nanocrystals as novel plasmonic and chemiresistive sensors for the detection of hazardous gases including hydrogen (H₂) and nitrogen dioxide (NO₂). GZO, [...] Read more.

In this paper, we demonstrate the application of ZnO doped with gallium (GZO), aluminum (AZO) and germanium (GeZO) nanocrystals as novel plasmonic and chemiresistive sensors for the detection of hazardous gases including hydrogen (H₂) and nitrogen dioxide (NO₂). GZO, AZO and GeZO nanocrystals are obtained by non-aqueous colloidal heat-up synthesis with high transparency in the visible range and strong localized surface plasmon resonance (LSPR) in the near IR range, tunable with dopant concentration (up to 20% mol nominal). Thanks to the strong sensitivity of the LSPR to chemical and electrical changes occurring at the surface of the nanocrystals, such optical features can be used to detect the presence of toxic gases. By monitoring the changes in the dopant-induced plasmon resonance in the near infrared, we demonstrate that GZO, AZO and GeZO thin films prepared depositing an assembly of highly doped ZnO colloids are able to optically detect both oxidizing and reducing gases at mild (<100 °C) operating temperatures. Combined optical and electrical measurements show that the dopants within ZnO nanocrystals enhance the gas sensing response compared to undoped ZnO. Full article

(This article belongs to the Proceedings of Proceedings of Eurosensors 2017, Paris, France, 3–6 September 2017)

► Show Figures

Figure 1

5 pages, 735 KiB

Open AccessProceeding Paper

Optical and Morphological Analysis of c-Si/PSi and c-Si/PSi/MWCNT/SiO_x Heterostructures

by Natanael Victoriano Huerta, José Alberto Luna López, Jose David Alvaro Hernández de la Luz, Estela Gómez Barojas and Miguel Angel Domínguez Jimenez

Proceedings 2017, 1(4), 320; https://doi.org/10.3390/proceedings1040320 - 9 Aug 2017

Viewed by 1970

Abstract

In the present work, the optical and morphological properties of Porous Silicon (PSi) in the c-Si-n/PSi and c-Si-n/SiP-n/MWCNT/SiO_x structures are studied and analyzed. The PSi layer is grown on n-type c-Si (<0.005 Ω·cm <100>) by electrochemical anodization using different currents as: 10, [...] Read more.

In the present work, the optical and morphological properties of Porous Silicon (PSi) in the c-Si-n/PSi and c-Si-n/SiP-n/MWCNT/SiO_x structures are studied and analyzed. The PSi layer is grown on n-type c-Si (<0.005 Ω·cm <100>) by electrochemical anodization using different currents as: 10, 50 and 100 mA. The etching solution used was C₂H₆O:HF:C₃H₈O₃ in a proportion of 6:3:1 by volume, respectively. The deposition of multi wall carbon nanotubes (MWNTs) on the PSi was done by spin coating, and later the surface was passivated by thermal oxidation. The porosity and thickness were obtained by gravimetry. UV-VIS spectroscopy and photoluminescence were used to obtain the optical properties and SEM was used to analyze the morphology. Full article

(This article belongs to the Proceedings of Proceedings of Eurosensors 2017, Paris, France, 3–6 September 2017)

► Show Figures

Figure 1

4 pages, 629 KiB

Open AccessProceeding Paper

Gas Sensors Based on Individual (Ga, In)₂O₃ Nanowires

by Elena López-Aymerich, Guillem Domènech-Gil, Mauricio Moreno-Sereno, Joan Daniel Prades, Paolo Pellegrino, Sven Barth and Albert Romano-Rodriguez

Proceedings 2017, 1(4), 321; https://doi.org/10.3390/proceedings1040321 - 21 Aug 2017

Cited by 1 | Viewed by 2857

Abstract

In this work the growth and characterisation of (Ga, In)₂O₃ NWs inside a CVD furnace using different mixtures of Ga₂O₃ and In₂O₃ is reported. The NWs have been characterised by SEM, XRD and TEM, [...] Read more.

In this work the growth and characterisation of (Ga, In)₂O₃ NWs inside a CVD furnace using different mixtures of Ga₂O₃ and In₂O₃ is reported. The NWs have been characterised by SEM, XRD and TEM, proving their cubic crystalline nature similar to In₂O₃ and the degree of incorporation of Ga in this lattice. Furthermore, gas nanosensors based on single NWs have been fabricated and measured, demonstrating the sensing properties of the synthesized material. Full article

(This article belongs to the Proceedings of Proceedings of Eurosensors 2017, Paris, France, 3–6 September 2017)

► Show Figures

Figure 1

4 pages, 594 KiB

Open AccessProceeding Paper

Eni Carbon Silicates: Innovative Hybrid Materials for Room-Temperature Gas Sensing

by Barbara Fabbri, Lucia Bonoldi, Vincenzo Guidi, Giuseppe Cruciani, Davide Casotti, Cesare Malagù, Giuseppe Bellussi, Roberto Millini, Luciano Montanari, Angela Carati, Caterina Rizzo, Erica Montanari and Stefano Zanardi

Proceedings 2017, 1(4), 322; https://doi.org/10.3390/proceedings1040322 - 30 Aug 2017

Viewed by 2483

Abstract

The purpose of this work was to satisfy both materials and technological sciences, on the one hand implementing innovative hybrid materials referred to as ECS (Eni Carbon Silicate) in gas sensors manufacturing, and on the other hand verifying their possible operation at room [...] Read more.

The purpose of this work was to satisfy both materials and technological sciences, on the one hand implementing innovative hybrid materials referred to as ECS (Eni Carbon Silicate) in gas sensors manufacturing, and on the other hand verifying their possible operation at room temperature as a technological progress. The ECS-14 and ECS-13 phases were employed as functional materials for films deposited by drop coating onto alumina substrates. Room-temperature gas tests were performed to study their potential sensing properties. In humidity conditions, the ECS-14 based sensor showed outstanding performance and a complete calibration vs. moisture concentration was obtained. Full article

(This article belongs to the Proceedings of Proceedings of Eurosensors 2017, Paris, France, 3–6 September 2017)

► Show Figures

Figure 1

5 pages, 1084 KiB

Open AccessProceeding Paper

Laser Interferometry for Broad Area SPR-Grating Couplers in Chemical Applications

by Mauricio Moreno-Sereno, Noemi Pérez, Guillem Domenech-Gil, Laura Parellada-Monreal, Miguel Martínez-Calderón, Mikel Gómez-Aranzadi, Nasser Darwish, Gemma G. Mandayo and Albert Romano-Rodriguez

Proceedings 2017, 1(4), 323; https://doi.org/10.3390/proceedings1040323 - 28 Aug 2017

Viewed by 2198

Abstract

In this work, the fabrication of a SPR (Surface Plasmon Resonance)-grating coupler using Laser Interference Lithography (LIL) has been investigated, giving rise to large area diffraction gratings on a 100 nm-thick gold film. The period of the diffraction grating is Λ = 500 [...] Read more.

In this work, the fabrication of a SPR (Surface Plasmon Resonance)-grating coupler using Laser Interference Lithography (LIL) has been investigated, giving rise to large area diffraction gratings on a 100 nm-thick gold film. The period of the diffraction grating is Λ = 500 nm. The SPR sensor has been tested towards several liquids showing a maximum sensitivity of S = 390 nm/RIU. Full article

(This article belongs to the Proceedings of Proceedings of Eurosensors 2017, Paris, France, 3–6 September 2017)

► Show Figures

Figure 1

4 pages, 893 KiB

Open AccessProceeding Paper

MEMS Sensors Based on Very Thin LTCC

by Alexey A. Vasiliev, Anton V. Nisan, Gleb N. Potapov, Nikolay N. Samotaev, Konstantin Yu. Oblov and Anastasia V. Ivanova

Proceedings 2017, 1(4), 324; https://doi.org/10.3390/proceedings1040324 - 16 Aug 2017

Viewed by 2493

Abstract

The application of thin LTCC is a very interesting and promising approach to the fabrication of ceramic MEMS gas sensors. The attempts to use this material were restricted till now by the thickness of commercial material (>50 μm). In this work, we found [...] Read more.

The application of thin LTCC is a very interesting and promising approach to the fabrication of ceramic MEMS gas sensors. The attempts to use this material were restricted till now by the thickness of commercial material (>50 μm). In this work, we found a possibility to fabricate thin LTCC membranes (20–30 μm) stretched on a frame made of 100 μm thick LTCC. Aerosol jet printed Pt microheater and laser cutting of the membrane gave a cantilever shaped microhotplate with hot spot of about 300 × 300 μm. Power consumption of the heater is ~150 mW at 450 °C. Full article

(This article belongs to the Proceedings of Proceedings of Eurosensors 2017, Paris, France, 3–6 September 2017)

► Show Figures

Figure 1

4 pages, 556 KiB

Open AccessProceeding Paper

DNA-Origami-Aided Lithography for Sub-10 Nanometer Pattern Printing

by Isaac Gállego, Brendan Manning, Joan Daniel Prades, Mònica Mir, Josep Samitier and Ramon Eritja

Proceedings 2017, 1(4), 325; https://doi.org/10.3390/proceedings1040325 - 8 Aug 2017

Cited by 2 | Viewed by 9336

Abstract

We report the first DNA-based origami technique that can print addressable patterns on surfaces with sub-10 nm resolution. Specifically, we have used a two-dimensional DNA origami as a template (DNA origami stamp) to transfer DNA with pre-programmed patterns (DNA ink) on gold surfaces. [...] Read more.

We report the first DNA-based origami technique that can print addressable patterns on surfaces with sub-10 nm resolution. Specifically, we have used a two-dimensional DNA origami as a template (DNA origami stamp) to transfer DNA with pre-programmed patterns (DNA ink) on gold surfaces. The DNA ink is composed of thiol-modified staple strands incorporated at specific positions of the DNA origami stamp to create patterns upon thiol-gold bond formation on the surface (DNA ink). The DNA pattern formed is composed of unique oligonucleotide sequences, each of which is individually addressable. As a proof-of-concept, we created a linear pattern of oligonucleotide-modified gold nanoparticles complementary to the DNA ink pattern. We have developed an in silico model to identify key elements in the formation of our DNA origami-driven lithography and nanoparticle patterning as well as simulate more complex nanoparticle patterns on surfaces. Full article

(This article belongs to the Proceedings of Proceedings of Eurosensors 2017, Paris, France, 3–6 September 2017)

► Show Figures

Figure 1

4 pages, 411 KiB

Open AccessProceeding Paper

Fabrication of Hybrid Microfluidic System on Transparent Substrates for Electrochemical Applications

by E. Holczer, O. Hakkel and P. Fürjes

Proceedings 2017, 1(4), 326; https://doi.org/10.3390/proceedings1040326 - 8 Aug 2017

Viewed by 1727

Abstract

In this work the critical aspects of the process sequence developed for fabrication of hybrid polymer microfluidic systems integrating metal electrode pattern and precisely aligned microfluidic structure are discussed in details. Glass and polycarbonate were considered as primary transparent substrate materials for metal [...] Read more.

In this work the critical aspects of the process sequence developed for fabrication of hybrid polymer microfluidic systems integrating metal electrode pattern and precisely aligned microfluidic structure are discussed in details. Glass and polycarbonate were considered as primary transparent substrate materials for metal (Au, Pt) electrode deposition and the microchannels were formed in multi-layered SU-8 negative photoresist. Poly(dimethylsiloxane) (PDMS) layer was proposed as cover layer to ensure proper sealing and sample inlet formation. Full article

(This article belongs to the Proceedings of Proceedings of Eurosensors 2017, Paris, France, 3–6 September 2017)

► Show Figures

Figure 1

4 pages, 358 KiB

Open AccessProceeding Paper

Characterization and Ammonia Sensing Properties of 2D SnS₂/SnO_2−x Flakes-Based Films

by S. G. Leonardi, W. Wlodarski, S. Ippolito, Y. Li, A. Wisitsoraat, N. Donato and G. Neri

Proceedings 2017, 1(4), 327; https://doi.org/10.3390/proceedings1040327 - 9 Aug 2017

Cited by 1 | Viewed by 2115

Abstract

Hybrid SnS₂-SnO_2−x flaked nanostructures were obtained from 2D-SnS₂ flakes deposited as a thin sensing film onto a conductometric transducing platform and annealed in air. The formation of 2D-SnS₂/SnO_2−x mixed phases and the materials morphologies were investigated [...] Read more.

Hybrid SnS₂-SnO_2−x flaked nanostructures were obtained from 2D-SnS₂ flakes deposited as a thin sensing film onto a conductometric transducing platform and annealed in air. The formation of 2D-SnS₂/SnO_2−x mixed phases and the materials morphologies were investigated by in situ Micro-Raman spectroscopy and SEM-EDX analysis. As annealing temperature of the sensitive film increases, the response towards ammonia increases showing a maximum at 250 °C. This behavior can be explained on the basis of the morphological modification and the formation of mixed phases. Full article

(This article belongs to the Proceedings of Proceedings of Eurosensors 2017, Paris, France, 3–6 September 2017)

► Show Figures

Figure 1

4 pages, 826 KiB

Open AccessProceeding Paper

Fabrication Tolerance Sensitivity in Large-Area Mid-Infrared Metamaterial Absorbers

by Mohammadamir Ghaderi, Ehsan Karimi, N. Pelin Ayerden and Reinoud F. Wolffenbuttel

Proceedings 2017, 1(4), 328; https://doi.org/10.3390/proceedings1040328 - 8 Aug 2017

Cited by 3 | Viewed by 2121

Abstract

Metamaterial absorbers are photonic structures composed of an array of sub-wavelength metallic patterns. Results in literature are usually based on structures of nominal dimensions, despite the significant effect of fabrication tolerances on performance. This research aims to identify the main sources of uncertainty [...] Read more.

Metamaterial absorbers are photonic structures composed of an array of sub-wavelength metallic patterns. Results in literature are usually based on structures of nominal dimensions, despite the significant effect of fabrication tolerances on performance. This research aims to identify the main sources of uncertainty and to investigate their effect, notably that of an irregular surface quality (i.e., roughness) of the thin metallic layer and the lithography related variations in size and shape. The effect of the shape and positioning of the resonance peak was investigated and validated using mid-infrared metamaterial absorbers. This sensitivity analysis is essential to the batch fabrication of metamaterial absorbers for MEMS applications. Full article

(This article belongs to the Proceedings of Proceedings of Eurosensors 2017, Paris, France, 3–6 September 2017)

► Show Figures

Figure 1

5 pages, 267 KiB

Open AccessProceeding Paper

A Novell Hall Magnetometer Using Dynamic Offset Cancellation

by Siya Lozanova, Svetoslav Noykov, L. Altunyan, A. Ivanov and Chavdar Roumenin

Proceedings 2017, 1(4), 329; https://doi.org/10.3390/proceedings1040329 - 9 Aug 2017

Cited by 1 | Viewed by 2420

Abstract

A novel Hall magnetometer using dynamic offset cancellation principle is presented. It consists from a single triangular silicon plate with three contacts and interface electronics. The proposed dynamic offset-cancelling measurement cycle includes three states. During each state, an external circuit is switched to [...] Read more.

A novel Hall magnetometer using dynamic offset cancellation principle is presented. It consists from a single triangular silicon plate with three contacts and interface electronics. The proposed dynamic offset-cancelling measurement cycle includes three states. During each state, an external circuit is switched to the plate contacts in a certain way. This way, the direction of current flow through the Hall plate is changed from phase to phase. At the same time, the output voltage is measured. After averaging the obtained three voltages per a measurement cycle, the offset voltage cancelled and this way the offset-free Hall voltage is obtained. The obtained offset reduction factor is very promising, reaching 120–130. The Hall device sensitivity is about 25 V/AT. Full article

(This article belongs to the Proceedings of Proceedings of Eurosensors 2017, Paris, France, 3–6 September 2017)

► Show Figures

Figure 1

4 pages, 640 KiB

Open AccessProceeding Paper

Angle Measurement and 3D Magnetic Field Sensing Using Circular Hall Microsensor

by S. Lozanova, S. Noykov, A. Ivanov and C. Roumenin

Proceedings 2017, 1(4), 330; https://doi.org/10.3390/proceedings1040330 - 8 Aug 2017

Viewed by 1821

Abstract

A new three-axis magnetometer for both 3-D magnetic field sensing and contactless in-plane 360° absolute angle encoding has been developed. The magnetometer is based on the Hall effect and consists of a circular in-plane sensitive CMOS Hall-effect microsensor, biasing and signal conditioning circuits. [...] Read more.

A new three-axis magnetometer for both 3-D magnetic field sensing and contactless in-plane 360° absolute angle encoding has been developed. The magnetometer is based on the Hall effect and consists of a circular in-plane sensitive CMOS Hall-effect microsensor, biasing and signal conditioning circuits. The sensing device contains a narrow n-well ring with a chain of contacts positioned radial on the ring. The signal conditioning circuit gives two output analogue signals: a voltage V_z, proportional to the magnetic field component B_z, and a sine wave function V_xy(t). The magnitude of the in-plane magnetic field B(x,y) is directly proportional to the sine amplitude and the phase Ψ corresponds to the angle between the applied in-plane magnetic field and a reference direction. Full article

(This article belongs to the Proceedings of Proceedings of Eurosensors 2017, Paris, France, 3–6 September 2017)

► Show Figures

Figure 1

4 pages, 821 KiB

Open AccessProceeding Paper

Monitoring the Etching Process in LPFGs towards Development of Highly Sensitive Sensors

by Ignacio Del Villar, Jose Luis Cruz, Abian Bentor Socorro, Silvia Diaz, Jesus Maria Corres, Francisco Javier Arregui and Ignacio Raul Matias

Proceedings 2017, 1(4), 331; https://doi.org/10.3390/proceedings1040331 - 11 Aug 2017

Cited by 2 | Viewed by 2004

Abstract

In this work, the monitoring of the etching process up to a diameter of 30 µm of two LPFG structures has been compared, one of them had initially 125 µm, whereas the second one had 80 µm. By tracking the wavelength shift of [...] Read more.

In this work, the monitoring of the etching process up to a diameter of 30 µm of two LPFG structures has been compared, one of them had initially 125 µm, whereas the second one had 80 µm. By tracking the wavelength shift of the resonance bands during the etching process it is possible to check the quality of etching process (the 80 µm fibre performs better than de 125 µm fibre), and to stop for a specific cladding mode coupling, which permits to obtain an improved sensitivity compared to the initial structure. Full article

(This article belongs to the Proceedings of Proceedings of Eurosensors 2017, Paris, France, 3–6 September 2017)

► Show Figures

Figure 1

4 pages, 804 KiB

Open AccessProceeding Paper

Absorption Based Characterization Method for Fluid Properties Using Electrowetting-on-Dielectric Forces: Modeling and Fabrication

by Andreas Tröls and Bernhard Jakoby

Proceedings 2017, 1(4), 332; https://doi.org/10.3390/proceedings1040332 - 11 Aug 2017

Viewed by 1921

Abstract

Electrowetting-on-Dielectrics (EWOD) can be used to build a device, where a polar fluid droplet gets actuated between two EWOD electrodes. In our setup, each electrode is located between a laser diode and an oppositely arranged photo diode. In that manner, the presence of [...] Read more.

Electrowetting-on-Dielectrics (EWOD) can be used to build a device, where a polar fluid droplet gets actuated between two EWOD electrodes. In our setup, each electrode is located between a laser diode and an oppositely arranged photo diode. In that manner, the presence of a fluid droplet located above one certain electrode can be optically detected by means of this transmission setup. The droplet’s viscosity dependent switching time, i.e., the time it takes to move the droplet between these two electrodes can be obtained by a time difference measurement of both transmission signals. CFD simulations of the switching time, which depends on the droplet’s viscosity, and furthermore absorption simulations according to the Beer Lambert law have been carried out with DI water as a sample fluid. A low-cost and rapid fabrication method of the so called absorption EWOD (aEWOD) switch is reported and the fabricated EWOD stack is characterized with the aid of surface profilometry. Full article

(This article belongs to the Proceedings of Proceedings of Eurosensors 2017, Paris, France, 3–6 September 2017)

► Show Figures

Figure 1

4 pages, 857 KiB

Open AccessProceeding Paper

Etched and Nanocoated SMS Fiber Sensor for Detection of Salinity Concentration

by Y. Cardona-Maya, Ignacio Del Villar, Abian Bentor Socorro, Jesus Maria Corres, Francisco Javier Arregui and J. F. Botero-Cadavid

Proceedings 2017, 1(4), 333; https://doi.org/10.3390/proceedings1040333 - 25 Aug 2017

Cited by 2 | Viewed by 1975

Abstract

An optical fibre refractometer has been developed by etching and deposition of a thin film of indium tin oxide (ITO) on a single-mode-multimode-single-mode (SMS) fibre structure. The interference between modes in this structure is sensitive to the refractive index changes of the surrounding [...] Read more.

An optical fibre refractometer has been developed by etching and deposition of a thin film of indium tin oxide (ITO) on a single-mode-multimode-single-mode (SMS) fibre structure. The interference between modes in this structure is sensitive to the refractive index changes of the surrounding medium, achieving sensitivities of up to 7000 nm/RIU in the 1.333–1.338 RIU range. A salinity sensor has been implemented as a practical application of this proposed structure. Fast Fourier transform (FFT) analysis and tracking of an interference dip were used to monitor the interference between modes obtaining sensitivities of 0.99 nm/PSU and 0.025 rad/PSU, respectively. Full article

(This article belongs to the Proceedings of Proceedings of Eurosensors 2017, Paris, France, 3–6 September 2017)

► Show Figures

Figure 1

5 pages, 1283 KiB

Open AccessProceeding Paper

Low-Power Heating Platform for the Characterization and Calibration of Scanning Thermal Probes

by Danick Briand, Tran Phong Nguyen, Etienne Lemaire, L. Thiery and P. Vairac

Proceedings 2017, 1(4), 334; https://doi.org/10.3390/proceedings1040334 - 25 Aug 2017

Viewed by 2332

Abstract

We report on a micro-hotplate technology platform optimized for the calibration of Scanning Thermal Microscopy probes (SThM) used in surface temperature measurement mode. The three chips designed include the same heating area with a calibration area of 10 × 10 µm² where [...] Read more.

We report on a micro-hotplate technology platform optimized for the calibration of Scanning Thermal Microscopy probes (SThM) used in surface temperature measurement mode. The three chips designed include the same heating area with a calibration area of 10 × 10 µm² where the SThM probes can land. The 1st design allows to study the influence of the nature of the material on the SThM probes thermal contact resistance. The 2nd design includes a resistive temperature sensor (RTD) integrated on the contact area, which is dedicated to evaluate the capability of a probe to measure a surface temperature. The 3rd design has a contact area made of a suspended platinum membrane for coupling SThM probes with optical thermal measurements. The thermal response of a thermocouple (TC) SThM probe was extracted demonstrating the relevance of these chips for SThM probes characterization and calibration. Full article

(This article belongs to the Proceedings of Proceedings of Eurosensors 2017, Paris, France, 3–6 September 2017)

► Show Figures

Figure 1

4 pages, 799 KiB

Open AccessProceeding Paper

Direct Piezoelectric Coefficient Measurements of PVDF and PLLA under Controlled Strain and Stress

by Francois Bernard, Leticia Gimeno, Bernard Viala, Boris Gusarov and Orphee Cugat

Proceedings 2017, 1(4), 335; https://doi.org/10.3390/proceedings1040335 - 16 Aug 2017

Cited by 21 | Viewed by 4205

Abstract

Open-circuit direct piezoelectric coefficients g₃₁ of bi-axially stretched PVDF and chiral PLLA are reported. This measure is decisive for sensor, generator and energy harvesting applications. We use an in-situ method with contactless voltage measurement during a conventional tensile-test, greatly improving measurement precision [...] Read more.

Open-circuit direct piezoelectric coefficients g₃₁ of bi-axially stretched PVDF and chiral PLLA are reported. This measure is decisive for sensor, generator and energy harvesting applications. We use an in-situ method with contactless voltage measurement during a conventional tensile-test, greatly improving measurement precision (error less than 10%). Full article

(This article belongs to the Proceedings of Proceedings of Eurosensors 2017, Paris, France, 3–6 September 2017)

► Show Figures

Figure 1

4 pages, 735 KiB

Open AccessProceeding Paper

Transparent Glass/SU8-Based Microfluidic Device with on-Channel Electrical Sensors

by Mohammadmahdi Talebi, Keith Cobry, Ananya Sengupta and Peter Woias

Proceedings 2017, 1(4), 336; https://doi.org/10.3390/proceedings1040336 - 17 Aug 2017

Cited by 9 | Viewed by 3228

Abstract

This paper presents a transparent microfluidic chip designed for continuous-flow photochemistry applications with integrated electrical sensing. The transparent chip design allows for microscale photochemistry, and permits direct, real-time visual/electrical observation. The microchip uses optically transparent indium tin oxide (ITO) electrodes for reagent and [...] Read more.

This paper presents a transparent microfluidic chip designed for continuous-flow photochemistry applications with integrated electrical sensing. The transparent chip design allows for microscale photochemistry, and permits direct, real-time visual/electrical observation. The microchip uses optically transparent indium tin oxide (ITO) electrodes for reagent and phase tracking. High-speed videography was performed to validate the electrical measurement data. Full article

(This article belongs to the Proceedings of Proceedings of Eurosensors 2017, Paris, France, 3–6 September 2017)

► Show Figures

Figure 1

6 pages, 2146 KiB

Open AccessProceeding Paper

A Monolithic Three-Axis Accelerometer with Wafer-Level Package by CMOS MEMS Process

by S. H. Tseng, C. Y. Yeh, A. Y. Chang, Y. J. Wang, P. C. Chen, H. H. Tsai and Y. Z. Juang

Proceedings 2017, 1(4), 337; https://doi.org/10.3390/proceedings1040337 - 11 Aug 2017

Cited by 7 | Viewed by 2594

Abstract

This paper presents a monolithic three-axis accelerometer with wafer-level package by CMOS MEMS process. The compositions of the microstructure are selected from CMOS layers in order to suppress the in-plane and out-of-plane bending deflection caused by the residual stresses in multiple layers. A [...] Read more.

This paper presents a monolithic three-axis accelerometer with wafer-level package by CMOS MEMS process. The compositions of the microstructure are selected from CMOS layers in order to suppress the in-plane and out-of-plane bending deflection caused by the residual stresses in multiple layers. A switched-capacitor sensing circuit with a trimming mechanism is used to amplify the capacitive signal, and decrease the output dc offset voltage to ensure the desired output voltage swing. The CMOS MEMS wafer is capped with a silicon wafer using a polymer-based material. The measured sensitivities with and without a wafer-level package range from 113 mV/G to 124 mV/G for the in-plane (x-axis, y-axis) accelerometer, and from 50 mV/G to 53 mV/G for the z-axis accelerometer, respectively. Full article

(This article belongs to the Proceedings of Proceedings of Eurosensors 2017, Paris, France, 3–6 September 2017)

► Show Figures

Figure 1

4 pages, 661 KiB

Open AccessProceeding Paper

Linear-Logarithmic CMOS Image Sensor with Reduced FPN Using Photogate and Cascode MOSFET

by Myunghan Bae, Byung-Soo Choi, Sang-Hwan Kim, Jimin Lee, Chang-Woo Oh, Pyung Choi and Jang-Kyoo Shin

Proceedings 2017, 1(4), 338; https://doi.org/10.3390/proceedings1040338 - 18 Aug 2017

Viewed by 2579

Abstract

We propose a linear-logarithmic CMOS image sensor with reduced fixed pattern noise (FPN). The proposed linear-logarithmic pixel based on a conventional 3-transistor active pixel sensor (APS) structure has additional circuits in which a photogate and a cascade MOSFET are integrated with the pixel [...] Read more.

We propose a linear-logarithmic CMOS image sensor with reduced fixed pattern noise (FPN). The proposed linear-logarithmic pixel based on a conventional 3-transistor active pixel sensor (APS) structure has additional circuits in which a photogate and a cascade MOSFET are integrated with the pixel structure in conjunction with the photodiode. To improve FPN, we applied the PMOSFET hard reset method as a reset transistor instead of NMOSFET reset normally used in APS. The proposed pixel has been designed and fabricated using 0.18-μm 1-poly 6-metal standard CMOS process. A 120 × 240 pixel array of test chip was divided into 2 different subsections with 60 × 240 sub-arrays, so that the proposed linear-logarithmic pixel with reduced FPN could be compared with the conventional linear-logarithmic pixel. We confirmed a reduction of pixel response variation which affected image quality. Full article

(This article belongs to the Proceedings of Proceedings of Eurosensors 2017, Paris, France, 3–6 September 2017)

► Show Figures

Figure 1

4 pages, 279 KiB

Open AccessProceeding Paper

Piezoresistive Pressure Sensors for Resin Flow Monitoring in Carbon Fibre-Reinforced Composite

by Maryam Kahali Moghaddam, Arne Breede, Adli Dimassi and Walter Lang

Proceedings 2017, 1(4), 339; https://doi.org/10.3390/proceedings1040339 - 18 Aug 2017

Cited by 2 | Viewed by 2585

Abstract

Using piezoresistive pressure sensors and in-situ measurement of pressure gradient, the infusion of resin in fiber reinforced composite can be optimized. The optimization of resin flow in Vacuum Assisted Resin Infusion (VARI) is necessary to produce high-quality fibre-reinforced composites. To control the resin [...] Read more.

Using piezoresistive pressure sensors and in-situ measurement of pressure gradient, the infusion of resin in fiber reinforced composite can be optimized. The optimization of resin flow in Vacuum Assisted Resin Infusion (VARI) is necessary to produce high-quality fibre-reinforced composites. To control the resin infusion process, piezoresistive pressure sensors are embedded to detect the resin flow and resin pressure in Carbon Fibre Reinforced Polymer (CFRP). The measured pressure validates the accuracy of analytical calculations, based on Darcy’s law in a porous medium. The sensors are of small size and therefore do not affect the natural flow of the resin. Full article

(This article belongs to the Proceedings of Proceedings of Eurosensors 2017, Paris, France, 3–6 September 2017)

► Show Figures

Figure 1

4 pages, 676 KiB

Open AccessProceeding Paper

A Combined Temperature and Stress Sensor in 0.18 μm CMOS Technology

by Samuel Huber, Samuel François and Oliver Paul

Proceedings 2017, 1(4), 340; https://doi.org/10.3390/proceedings1040340 - 8 Aug 2017

Viewed by 3223

Abstract

This paper presents a solution for on-chip temperature and mechanical stress measurement in CMOS integrated circuits. Thereby both temperature and stress sensors are realized as resistive Wheatstone bridges. By design, both sensors show outputs affected by non-linearities and parasitic cross-sensitivities. The novelty presented [...] Read more.

This paper presents a solution for on-chip temperature and mechanical stress measurement in CMOS integrated circuits. Thereby both temperature and stress sensors are realized as resistive Wheatstone bridges. By design, both sensors show outputs affected by non-linearities and parasitic cross-sensitivities. The novelty presented in this work is to combine both non-ideal sensor outputs by applying a two-dimensional Newton-Raphson method to extract the actual values of temperature and mechanical stress which were obtained with errors of less than 0.5 K and 0.5 MPa. Full article

(This article belongs to the Proceedings of Proceedings of Eurosensors 2017, Paris, France, 3–6 September 2017)

► Show Figures

Figure 1

4 pages, 334 KiB

Open AccessProceeding Paper

Harsh Environmental Surface Acoustic Wave Temperature Sensor Based on Pure and Scandium doped Aluminum Nitride on Sapphire

by Manuel Gillinger, Theresia Knobloch, Michael Schneider and Ulrich Schmid

Proceedings 2017, 1(4), 341; https://doi.org/10.3390/proceedings1040341 - 17 Aug 2017

Cited by 9 | Viewed by 2803

Abstract

This paper investigates the performance of surface acoustic wave (SAW) devices as low power MEMS temperature sensors using reactive sputter deposited aluminum nitride (AlN) and scandium doped aluminum nitride (AlScN) as piezoelectric layers on sapphire substrates. In detail, devices with a wavelength of [...] Read more.

This paper investigates the performance of surface acoustic wave (SAW) devices as low power MEMS temperature sensors using reactive sputter deposited aluminum nitride (AlN) and scandium doped aluminum nitride (AlScN) as piezoelectric layers on sapphire substrates. In detail, devices with a wavelength of 16 μm are fabricated with both AlN and AlScN films having a resonance frequency at room temperature of ~354 MHz and ~349 MHz, respectively. The samples are placed in a furnace and measured in argon atmosphere up to 800 °C. The temperature dependency on the frequency shows for both materials a linear decrease up to the maximum measured temperature level resulting in constant temperature coefficients of −27.62 kHz/°C and −27.81 kHz/°C, respectively. Full article

(This article belongs to the Proceedings of Proceedings of Eurosensors 2017, Paris, France, 3–6 September 2017)

► Show Figures

Figure 1

5 pages, 821 KiB

Open AccessProceeding Paper

MEMS Capacitive Microphone with Dual-Anchored Membrane

by Chang Han Je, Ju Hyun Jeon, Sung Q. Lee and Woo Seok Yang

Proceedings 2017, 1(4), 342; https://doi.org/10.3390/proceedings1040342 - 9 Aug 2017

Cited by 1 | Viewed by 3173

Abstract

In this paper, we proposed a MEMS capacitive microphone with a dual-anchored membrane. The proposed dual anchor could minimize the deviation of operating characteristics of the membrane according to the fabrication process variation. The membrane is connected and fixed to the back plate [...] Read more.

In this paper, we proposed a MEMS capacitive microphone with a dual-anchored membrane. The proposed dual anchor could minimize the deviation of operating characteristics of the membrane according to the fabrication process variation. The membrane is connected and fixed to the back plate insulating silicon nitride structures instead to the sacrificial bottom insulating oxide layer so that its effective size and boundary conditions are not changed according to the process variation. The proposed dual-anchored MEMS microphone is fabricated by the conventional fabrication process without no additional process and mask. It has a sensing membrane of 500 μm diameter, an air gap of 2.0 μm and 12 dual anchors of 15 μm diameter. The resonant frequency and the pull-in voltage of the fabricated device is 36.3 ± 1.3 kHz and 6.55 ± 0.20 V, respectively. Full article

(This article belongs to the Proceedings of Proceedings of Eurosensors 2017, Paris, France, 3–6 September 2017)

► Show Figures

Figure 1

5 pages, 1053 KiB

Open AccessProceeding Paper

MEMS Inertial Switch for Military Applications

by Hyo-Nam Lee, Seung-Gyo Jang, Sungryeol Lee, Jeong-Sun Lee and Young-Suk Hwang

Proceedings 2017, 1(4), 343; https://doi.org/10.3390/proceedings1040343 - 9 Aug 2017

Cited by 6 | Viewed by 3174

Abstract

We developed a MEMS inertial switch (hereafter, the switch) for an ignition system of missiles. The developed switch consists of four folded beams and a plate suspended by the beams, analogous to a well-known spring-mass system. The plate and four beams compose a [...] Read more.

We developed a MEMS inertial switch (hereafter, the switch) for an ignition system of missiles. The developed switch consists of four folded beams and a plate suspended by the beams, analogous to a well-known spring-mass system. The plate and four beams compose a single body, which is made from single crystalline silicon wafers by deep reactive ion etching techniques. This process gives high thermal stability and stress-free structure. The switching, either open or close a conductive path, is achieved by the movement of the plate suspended with four folded beams when the acceleration exceeds a predetermined threshold. With a spinning-rate table, the function of the switch was tested at various revolution speeds. The test results are compared with the calculation results by our analytical model. Full article

(This article belongs to the Proceedings of Proceedings of Eurosensors 2017, Paris, France, 3–6 September 2017)

► Show Figures

Figure 1

4 pages, 285 KiB

Open AccessProceeding Paper

CMOS Technology Integrated Terahertz Rectifier

by Rosario Rao, Giovanni De Amicis, Andrea Del Monte and Fabrizio Palma

Proceedings 2017, 1(4), 344; https://doi.org/10.3390/proceedings1040344 - 22 Aug 2017

Cited by 2 | Viewed by 2093

Abstract

We present new developments of CMOS compatible direct conversion terahertz detector operating at room temperature. The rectenna consists of an integrated antenna, realized on the surface of the integrated circuit and connected to a nanometric metallic whisker at one of its edges. The [...] Read more.

We present new developments of CMOS compatible direct conversion terahertz detector operating at room temperature. The rectenna consists of an integrated antenna, realized on the surface of the integrated circuit and connected to a nanometric metallic whisker at one of its edges. The rectifying device can be obtained introducing just minor modifications of the charge storage well in conventional CMOS active pixel image sensor devices, making the proposed solution easy to integrate with existing imaging systems. In the paper we present technological developments of the rectifier structure, realized with minor changes from a standard 0.15 µm technology node. We also present the study of a patch antenna which can be directly integrated on the chip. Full article

(This article belongs to the Proceedings of Proceedings of Eurosensors 2017, Paris, France, 3–6 September 2017)

► Show Figures

Figure 1

4 pages, 1804 KiB

Open AccessProceeding Paper

Cricket Inspired High Efficiency MEMS Speakers

by Meera Garud, Vamsy Godthi, Jayaprakash Reddy, Ajay Dangi and Rudra Pratap

Proceedings 2017, 1(4), 345; https://doi.org/10.3390/proceedings1040345 - 18 Aug 2017

Cited by 5 | Viewed by 2775

Abstract

We report on the realization of a biomimetic MEMS speaker inspired by field crickets. This speaker is at least five times thinner and four times more efficient than the current dynamic speakers used in portable electronics. We present results of the acoustic characterization [...] Read more.

We report on the realization of a biomimetic MEMS speaker inspired by field crickets. This speaker is at least five times thinner and four times more efficient than the current dynamic speakers used in portable electronics. We present results of the acoustic characterization of a single MEMS speaker. Computational extrapolation of the results suggests that an array of such thin speakers will be highly efficient compared to the existing speakers of equal area. Full article

(This article belongs to the Proceedings of Proceedings of Eurosensors 2017, Paris, France, 3–6 September 2017)

► Show Figures

Figure 1

5 pages, 1747 KiB

Open AccessProceeding Paper

A Comb-Based Capacitive MEMS Microphone with High Signal-to-Noise Ratio: Modeling and Noise-Level Analysis

by Sebastian Anzinger, Johannes Manz, Alfons Dehe and Gabriele Schrag

Proceedings 2017, 1(4), 346; https://doi.org/10.3390/proceedings1040346 - 8 Aug 2017

Cited by 3 | Viewed by 3227

Abstract

We present a physics-based system-level model for optimizing a novel comb-based capacitive MEMS microphone towards high signal-to-noise ratios. The model includes non-linear coupling effects between the electrodes as well as the physical dependencies on relevant design parameters, thus enabling predictive statements w.r.t. the [...] Read more.

We present a physics-based system-level model for optimizing a novel comb-based capacitive MEMS microphone towards high signal-to-noise ratios. The model includes non-linear coupling effects between the electrodes as well as the physical dependencies on relevant design parameters, thus enabling predictive statements w.r.t. the device performance. It is calibrated and validated by finite element simulations and laser Doppler vibrometer measurements of first prototypes. Being formulated as a generalized Kirchhoffian network, it can be implemented in a standard circuit simulation tool. The predicted signal-to-noise ratio of this concept reaches up to 78 dB(A), which significantly exceeds state-of-the-art devices. Full article

(This article belongs to the Proceedings of Proceedings of Eurosensors 2017, Paris, France, 3–6 September 2017)

► Show Figures

Figure 1

4 pages, 693 KiB

Open AccessProceeding Paper

1 Million-Q Optomechanical Microdisk Resonators with Very Large Scale Integration

by Maxime Hermouet, Louise Banniard, Marc Sansa, Alexandre Fafin, Marc Gely, Sébastien Pauliac, Pierre Brianceau, Jacques-Alexandre Dallery, Pierre Etienne Allain, Eduardo Gil Santos, Ivan Favero, Thomas Alava, Guillaume Jourdan and Sébastien Hentz

Proceedings 2017, 1(4), 347; https://doi.org/10.3390/proceedings1040347 - 28 Aug 2017

Cited by 3 | Viewed by 2255

Abstract

Cavity optomechanics have become a promising route towards the development of ultrasensitive sensors for a wide range of applications including mass, chemical and biological sensing. We demonstrate the potential of Very Large Scale Integration (VLSI) with state-of-the-art low-loss performance silicon optomechanical microdisks for [...] Read more.

Cavity optomechanics have become a promising route towards the development of ultrasensitive sensors for a wide range of applications including mass, chemical and biological sensing. We demonstrate the potential of Very Large Scale Integration (VLSI) with state-of-the-art low-loss performance silicon optomechanical microdisks for real-world applications. We report microdisks exhibiting optical Whispering Gallery Modes (WGM) with 1 million quality factors. These high-Q microdisks allow their Brownian motion to be resolved at few 100 MHz in ambient air. Such performance shows our VLSI process is a viable approach for the next generation of high-end sensors operating in vacuum, gas or liquid phase. Full article

(This article belongs to the Proceedings of Proceedings of Eurosensors 2017, Paris, France, 3–6 September 2017)

► Show Figures

Figure 1

4 pages, 424 KiB

Open AccessProceeding Paper

Characterization of Acoustic Sources by Optical Feedback Interferometry

by Fernando Urgiles, Julien Perchoux and Thierry Bosch

Proceedings 2017, 1(4), 348; https://doi.org/10.3390/proceedings1040348 - 23 Aug 2017

Cited by 2 | Viewed by 2161

Abstract

Sound can be described as the propagation of pressure variations in compressible media that involves compression and expansion and induces a change in the density of the medium. This change in acoustic pressure as it induces a change of the refractive index can [...] Read more.

Sound can be described as the propagation of pressure variations in compressible media that involves compression and expansion and induces a change in the density of the medium. This change in acoustic pressure as it induces a change of the refractive index can be measured by optical methods, the most recent being the optical feedback interferometry. With this technique, a laser diode is beaming on a reflective surface thus creating a cavity where the acoustic wave propagates. This paper presents anovel experimental technique to measure radiation pattern of acoustic sources based on optical feedback interferometry in a laser diode. Full article

(This article belongs to the Proceedings of Proceedings of Eurosensors 2017, Paris, France, 3–6 September 2017)

► Show Figures

Figure 1

4 pages, 831 KiB

Open AccessProceeding Paper

Analysis on Chattering Phenomena by the Tilt of the Proof Mass in MEMS Switch

by Jung-Min Hwang, Jeongki Hwang, Daeho Ryu, Seung-Gyo Jang and Yong-Kweon Kim

Proceedings 2017, 1(4), 349; https://doi.org/10.3390/proceedings1040349 - 29 Aug 2017

Viewed by 2032

Abstract

This paper reports an analysis on the relationship between the tilt of the proof mass in MEMS switch and the chattering phenomena. Low-g MEMS acceleration switch developed by Kim’s group was modelled in 2D and displacements of each end of the proof mass [...] Read more.

This paper reports an analysis on the relationship between the tilt of the proof mass in MEMS switch and the chattering phenomena. Low-g MEMS acceleration switch developed by Kim’s group was modelled in 2D and displacements of each end of the proof mass were analysed using RK 4th method. Some elementary assumptions were made to ease the modelling and analysis. The chattering time of the MEMS switch gets longer as the tilt of the proof mass increases. The reason is that the elongated travel distance of one end of proof mass increases the impact velocity and lengthens the bouncing back time. From the results, we found that the chattering phenomena can last very long even if the tilt of the proof mass is very small. Full article

(This article belongs to the Proceedings of Proceedings of Eurosensors 2017, Paris, France, 3–6 September 2017)

► Show Figures

Figure 1

4 pages, 536 KiB

Open AccessProceeding Paper

Torsional Moving Electric Field Sensor with Modulated Sensitivity and without Reference Ground

by Sampath Liyanage, Cyrus Shafai, Tao Chen and Athula Rajapakse

Proceedings 2017, 1(4), 350; https://doi.org/10.3390/proceedings1040350 - 8 Aug 2017

Cited by 9 | Viewed by 2209

Abstract

A MEMS electric field sensor is presented with wide measurement resolution and adjustable sensitivity. The sense membrane is mounted using torsional springs and employs opposite biased electrodes on its surface, causing rotation in presence of an electric field, enabling operation without reference ground. [...] Read more.

A MEMS electric field sensor is presented with wide measurement resolution and adjustable sensitivity. The sense membrane is mounted using torsional springs and employs opposite biased electrodes on its surface, causing rotation in presence of an electric field, enabling operation without reference ground. Control of electrode bias enables adjustable linear measurement range from V/m to MV/m. Compared to earlier works with vertical moving sense membranes, higher sensitivity is achieved for the same bias voltage. Employing on-board electronics to enable independent resonant operation, a noise limited resolution of 3 V/m was achieved. Full article

(This article belongs to the Proceedings of Proceedings of Eurosensors 2017, Paris, France, 3–6 September 2017)

► Show Figures

Figure 1

5 pages, 801 KiB

Open AccessProceeding Paper

Large Tilt Angle Lorentz Force Actuated Micro-Mirror with 3 DOF for Optical Applications

by Elnaz Afsharipour, Byoungyoul Park and Cyrus Shafai

Proceedings 2017, 1(4), 351; https://doi.org/10.3390/proceedings1040351 - 8 Aug 2017

Cited by 4 | Viewed by 2095

Abstract

A versatile MEMS micro-mirror for optical platforms is presented, that operates using Lorentz force for actuation, resulting in low voltage operation. While maintaining below 20 mA drive current, this mirror has a tilting angle of over 50° and 20° around two diagonal axes [...] Read more.

A versatile MEMS micro-mirror for optical platforms is presented, that operates using Lorentz force for actuation, resulting in low voltage operation. While maintaining below 20 mA drive current, this mirror has a tilting angle of over 50° and 20° around two diagonal axes and a linear motion of 1.5 mm in vertical axis. Compared to other works, it has larger angle of rotation and additional out of plane linear motion. The temperature rise on the mirror is kept bellow 25 °C to avoid thermal expansion of the support flexures and curvature of the mirror. Full article

(This article belongs to the Proceedings of Proceedings of Eurosensors 2017, Paris, France, 3–6 September 2017)

► Show Figures

Figure 1

5 pages, 933 KiB

Open AccessProceeding Paper

Steady-State and Transient Response of a Micromechanical Broadband Shoaling Amplifier

by Michelle Müller, Verena Maiwald, Cosmin Roman and Christofer Hierold

Proceedings 2017, 1(4), 352; https://doi.org/10.3390/proceedings1040352 - 7 Sep 2017

Viewed by 2186

Abstract

An in-plane MEMS broadband shoaling motion amplitude amplifier based on a coupled mass-spring system is presented. It is shown how the amplification amplitude can be traded for the operational bandwidth by design. Three devices with different numbers of masses (three, five and seven), [...] Read more.

An in-plane MEMS broadband shoaling motion amplitude amplifier based on a coupled mass-spring system is presented. It is shown how the amplification amplitude can be traded for the operational bandwidth by design. Three devices with different numbers of masses (three, five and seven), but all of them with the same total mass, were fabricated in silicon. The achieved baseline-amplification × bandwidth product ranges from 18.0 dB × 11.5 kHz for the seven mass device to 27.7 dB × 3.9 kHz for the three mass device. Transient recordings show amplification along the mass-spring-chain. The response time to reach the baseline amplification was found to be in the order of 10⁻⁴ s. This passive device can be used for ultra-low power structural and environmental monitoring (e.g., bridges, pipelines or rock-faces). Full article

(This article belongs to the Proceedings of Proceedings of Eurosensors 2017, Paris, France, 3–6 September 2017)

► Show Figures

Figure 1

5 pages, 1080 KiB

Open AccessProceeding Paper

An Electromagnetically-Driven Piezoresistively Sensed CMOS MEMS Scanning Mirror for Projection Display

by Zhong-He Li, Yu-Tang Lin and Michael S.-C. Lu

Proceedings 2017, 1(4), 353; https://doi.org/10.3390/proceedings1040353 - 8 Aug 2017

Cited by 5 | Viewed by 2222

Abstract

Bi-axial MEMS scanning mirrors are considered the key component for applications like laser scanning projectors and Lidars. Most studies have shown fabricated devices driven by open-loop operation without sensing, making it difficult to meet the requirements for practical applications. To facilitate bi-axial closed-loop [...] Read more.

Bi-axial MEMS scanning mirrors are considered the key component for applications like laser scanning projectors and Lidars. Most studies have shown fabricated devices driven by open-loop operation without sensing, making it difficult to meet the requirements for practical applications. To facilitate bi-axial closed-loop operation, this work presents an electro magnetically-driven scanning mirror with piezoresistive sensing conveniently implemented in a CMOS (complementary metal oxide semiconductor) process. The measured resonant frequencies with respect to the slow and fast axes are 4.3 and 36.05 kHz, respectively, with the aim to provide SXGA display resolution. Full article

(This article belongs to the Proceedings of Proceedings of Eurosensors 2017, Paris, France, 3–6 September 2017)

► Show Figures

Figure 1

4 pages, 1158 KiB

Open AccessProceeding Paper

High Gauge Factor Piezoresistors Using Aluminium Induced Crystallisation of Silicon at Low Thermal Budget

by Ian Chuang, Aron Michael and Chee Yee Kwok

Proceedings 2017, 1(4), 354; https://doi.org/10.3390/proceedings1040354 - 5 Sep 2017

Viewed by 2375

Abstract

This paper reports on polysilicon piezo-resistors that are fabricated at a low thermal budget using aluminium-induced-crystallization (AIC) of ultra-high-vacuum e-beam evaporated silicon films. By in-situ phosphorus doping of precursor amorphous silicon films e-beam evaporated at room temperature on aluminium layer, we are able [...] Read more.

This paper reports on polysilicon piezo-resistors that are fabricated at a low thermal budget using aluminium-induced-crystallization (AIC) of ultra-high-vacuum e-beam evaporated silicon films. By in-situ phosphorus doping of precursor amorphous silicon films e-beam evaporated at room temperature on aluminium layer, we are able to increase and control the gauge factor of the polysilicon films formed by AIC at 450 °C. Piezo-resistors made from the polysilicon films are integrated on microcantilever beams to measure their gauge factors. Gauge factors as high as 62 is obtained for 2 × 10¹⁸/cm³ phosphorus doping level in the precursor amorphous silicon film. The measured gauge factors are significantly higher than previously reported values for polysilicon films. Full article

(This article belongs to the Proceedings of Proceedings of Eurosensors 2017, Paris, France, 3–6 September 2017)

► Show Figures

Figure 1

4 pages, 1261 KiB

Open AccessProceeding Paper

Tuning the Anti-Phase Mode Sensitivity to Vibrations of a MEMS Gyroscope

by Pierre Janioud, Alexandra Koumela, Christophe Poulain, Patrice Rey, Audrey Berthelot, Panagiota Morfouli and Guillaume Jourdan

Proceedings 2017, 1(4), 355; https://doi.org/10.3390/proceedings1040355 - 8 Aug 2017

Cited by 1 | Viewed by 2441

Abstract

This paper proposes a stiffness correction method to improve the resilience to vibration of a dual-mass MEMS gyroscope with a particular focus near the resonance frequency of the anti-phase drive mode (f_Da), i.e., its operational mode. Because of its balanced [...] Read more.

This paper proposes a stiffness correction method to improve the resilience to vibration of a dual-mass MEMS gyroscope with a particular focus near the resonance frequency of the anti-phase drive mode (f_Da), i.e., its operational mode. Because of its balanced shape, this operating mode is ideally insensitive to vibrations. However, fabrication imperfections generates a residual sensitivity to parasitic vibrations that can disturb normal operation of the sensor. This work shows that the application of a DC voltage (V_tr) at the drive actuation electrode enables to decrease this sensitivity by a factor of at least 30 because of the stiffness tuning of the dual-mass structure. Experiments are performed to confirm this assumption and an efficient stiffness correction method is proposed to improve device operation. Full article

(This article belongs to the Proceedings of Proceedings of Eurosensors 2017, Paris, France, 3–6 September 2017)

► Show Figures

Figure 1

4 pages, 3291 KiB

Open AccessProceeding Paper

Development of Catheter Flow Sensor for Breathing Measurements at Different Levels of Tracheobronchial Airway

by Tomohiro Fujinori, Yoshihiro Hasegawa, Miyoko Matsushima, Tsutomo Kawabe and Mitsuhiro Shikida

Proceedings 2017, 1(4), 356; https://doi.org/10.3390/proceedings1040356 - 21 Aug 2017

Viewed by 2396

Abstract

We attempted to develop different sized catheter flow sensors for evaluating breathing characteristics at different levels of the tracheobronchial airway in a lung system. Two catheter flow sensors with 1.8 and 3.5 mm outer diameters were designed for measuring breathing characteristics in bronchus- [...] Read more.

We attempted to develop different sized catheter flow sensors for evaluating breathing characteristics at different levels of the tracheobronchial airway in a lung system. Two catheter flow sensors with 1.8 and 3.5 mm outer diameters were designed for measuring breathing characteristics in bronchus- and bronchiole- regions in the lung system, respectively. They were fabricated by using photolithography and heat shrinkable tube packaging processes. We experimentally investigated the fundamental sensor characteristic and found that the sensor output depended on the mean flow velocity. The developed catheter flow sensors also successfully detected the oscillating airflow produced by an artificial ventilator. Full article

(This article belongs to the Proceedings of Proceedings of Eurosensors 2017, Paris, France, 3–6 September 2017)

► Show Figures

Figure 1

5 pages, 2189 KiB

Open AccessProceeding Paper

Micromachined Tube Type Thermal Flow Sensor for Adult-Sized Tracheal Intubation Tube

by Shun Watanabe, Yoshihiro Hasegawa, Miyoko Matsushima, Tsutomu Kawabe and Mitsuhiro Shikida

Proceedings 2017, 1(4), 357; https://doi.org/10.3390/proceedings1040357 - 7 Sep 2017

Cited by 4 | Viewed by 3317

Abstract

We designed and fabricated a tube-type thermal flow sensor for fabricating an adult-sized tracheal intubation tube device intended for clinical practice. The sensor film was packaged into the inside surface of the tube by interface tension and parylene coating, and a flow sensor [...] Read more.

We designed and fabricated a tube-type thermal flow sensor for fabricating an adult-sized tracheal intubation tube device intended for clinical practice. The sensor film was packaged into the inside surface of the tube by interface tension and parylene coating, and a flow sensor for an adult-sized tracheal intubation tube was successfully produced. We experimentally investigated flow rate detection and response time and found that the flow sensor fitted King’s model in terms of flow rate detection and has a sufficiently short response time of 59 ms. Thus, we concluded that the developed sensor will be applicable to measuring breathing characteristics of adults in the near future. Finally, the developed sensor was assembled into a tracheal intubation tube actually used in medical treatment. Full article

(This article belongs to the Proceedings of Proceedings of Eurosensors 2017, Paris, France, 3–6 September 2017)

► Show Figures

Figure 1

4 pages, 1298 KiB

Open AccessProceeding Paper

Temperature Sensors Integrated into a CMOS Image Sensor

by Accel Abarca, Shuang Xie, Jules Markenhof and Albert Theuwissen

Proceedings 2017, 1(4), 358; https://doi.org/10.3390/proceedings1040358 - 7 Sep 2017

Cited by 1 | Viewed by 3569

Abstract

In this work, a novel approach is presented for measuring relative temperature variations inside the pixel array of a CMOS image sensor itself. This approach can give important information when compensation for dark (current) fixed pattern noise (FPN) is needed. The test image [...] Read more.

In this work, a novel approach is presented for measuring relative temperature variations inside the pixel array of a CMOS image sensor itself. This approach can give important information when compensation for dark (current) fixed pattern noise (FPN) is needed. The test image sensor consists of pixels and temperature sensors pixels (=Tixels). The size of the Tixels is 11 μm × 11 μm. Pixels and Tixels are placed next to each other in the active imaging array and use the same readout circuits. The design and the first measurements of the combined image-temperature sensor are presented. Full article

(This article belongs to the Proceedings of Proceedings of Eurosensors 2017, Paris, France, 3–6 September 2017)

► Show Figures

Figure 1

5 pages, 1471 KiB

Open AccessProceeding Paper

Development of Small-Footprint Thermal Sensor Detecting Airflow at Mouth in Baby

by Yuki Mitsunari, Yoshihiro Hasegawa, Miyoko Matsushima, Tsutomu Kawabe and Mitsuhiro Shikida

Proceedings 2017, 1(4), 359; https://doi.org/10.3390/proceedings1040359 - 7 Aug 2017

Cited by 5 | Viewed by 2206

Abstract

This paper presents a novel tube flow sensor to measure airflow in mouths for detecting respiration and heartbeat signals of premature babies in incubators. A flow rate sensor with temperature compensation and a flow direction sensor were combined to decrease their footprint on [...] Read more.

This paper presents a novel tube flow sensor to measure airflow in mouths for detecting respiration and heartbeat signals of premature babies in incubators. A flow rate sensor with temperature compensation and a flow direction sensor were combined to decrease their footprint on a sensor film. The fabricated sensor film was assembled onto the inside surface of the tube, and its detection properties were investigated. The sensor output in the flow rate sensor obeyed King’s model. The value of output in the flow-direction sensor was changed in accordance with the change of the airflow direction. Full article

(This article belongs to the Proceedings of Proceedings of Eurosensors 2017, Paris, France, 3–6 September 2017)

► Show Figures

Figure 1

5 pages, 697 KiB

Open AccessProceeding Paper

Flexible Hydrogel Capacitive Pressure Sensor for Underwater Applications

by Elgar Kanhere, Meghali Bora, Jianmin Miao and Michael Triantafyllou

Proceedings 2017, 1(4), 360; https://doi.org/10.3390/proceedings1040360 - 7 Aug 2017

Cited by 6 | Viewed by 3115

Abstract

This paper reports development of a novel, flexible hydrogel based capacitive pressure sensor. It features a simple design of hydrogel thin film sandwiched between two gold electrodes. The sensor shows linear increase in output with increase in pressure. The microporous network of hydrogel [...] Read more.

This paper reports development of a novel, flexible hydrogel based capacitive pressure sensor. It features a simple design of hydrogel thin film sandwiched between two gold electrodes. The sensor shows linear increase in output with increase in pressure. The microporous network of hydrogel enables high water retention while its flexible and stretchable structure ensures usage over large areas. These factors, combined with its stability in water, make it an ideal candidate for underwater applications. Further, the physical and chemical properties of hydrogels can be tailored to tune the capacitance to specific sensing needs. Flexible arrays of capacitive sensors with hydrogel hold great potential for underwater smart skin applications. Full article

(This article belongs to the Proceedings of Proceedings of Eurosensors 2017, Paris, France, 3–6 September 2017)

► Show Figures

Figure 1

4 pages, 374 KiB

Open AccessProceeding Paper

Portable SAW Impedance Sensor Using a 1-Port Resonator Approach

by Vu Hoa Nguyen, Oliver Peters, Sam Serve and Uwe Schnakenberg

Proceedings 2017, 1(4), 361; https://doi.org/10.3390/proceedings1040361 - 11 Aug 2017

Cited by 3 | Viewed by 2118

Abstract

All actually used SAW sensors have in common that they analyze the transmission characteristics of propagating SAWs. Here, a portable device using the SAW-based impedance sensor type based on one interdigital transducer (IDT) simultaneously as SAW generator and sensor element (1-port approach) is [...] Read more.

All actually used SAW sensors have in common that they analyze the transmission characteristics of propagating SAWs. Here, a portable device using the SAW-based impedance sensor type based on one interdigital transducer (IDT) simultaneously as SAW generator and sensor element (1-port approach) is presented. The input port reflection coefficient S₁₁ is measured at the IDT instead of the commonly used S₂₁ transmission forward gain parameter. As a novelty, the so far required expensive vector network analyzer (VNA) is replaced by a hand-held device to measure the impedance spectrum of the SAW sensor by RF-gain-phase meters. The pivotal aspect of the portable system is the transfer of the sophisticated high frequency approach into a quasi-static one. This enables the use of simple lumped electronics without the need of impedance matching circuits. Proof-of-concept was carried out by measuring conductivities of phosphate-buffered solutions (PBS) and viscosities of glycerin. Sensitivities for conductivity of 64 Hz/S cm⁻¹ and for viscosity of 122 mΩ/mPas were obtained, respectively. Full article

(This article belongs to the Proceedings of Proceedings of Eurosensors 2017, Paris, France, 3–6 September 2017)

► Show Figures

Figure 1

4 pages, 750 KiB

Open AccessProceeding Paper

Air-Coupled Ultrasonic Ferroelectret Receiver with Additional DC Voltage

by Mate Gaal, Rui Caldeira, Jürgen Bartusch and Mario Kupnik

Proceedings 2017, 1(4), 362; https://doi.org/10.3390/proceedings1040362 - 16 Aug 2017

Cited by 1 | Viewed by 2345

Abstract

Highly sensitive air-coupled ultrasonic sensors are essential for various applications such as testing of composite materials. One of the major challenges for the development of air-coupled ultrasonic sensors is the impedance matching to air. With a lower acoustic impedance than the usual piezoelectric [...] Read more.

Highly sensitive air-coupled ultrasonic sensors are essential for various applications such as testing of composite materials. One of the major challenges for the development of air-coupled ultrasonic sensors is the impedance matching to air. With a lower acoustic impedance than the usual piezoelectric materials, charged cellular polypropylene film (cPP) offers better matching to air with a similar piezoelectric coefficient. The piezoelectric behaviour demonstrated by cPP comes from polarized air cells that create a permanent internal voltage. The sensitivity of the sensor varies with the application of an additional DC bias voltage. Thus, this work presents a cPP ultrasonic sensor with an improvement of up to 15 ± 1 dB on the signal-to-noise ratio. Full article

(This article belongs to the Proceedings of Proceedings of Eurosensors 2017, Paris, France, 3–6 September 2017)

► Show Figures

Figure 1

5 pages, 933 KiB

Open AccessProceeding Paper

Single-Element Omnidirectional Piezoelectric Ultrasound Transducer for under Water Communication

by Sina Sadeghpour, Sebastian Meyers, Jean-Pierre Kruth, Jef Vleugels and Robert Puers

Proceedings 2017, 1(4), 363; https://doi.org/10.3390/proceedings1040363 - 16 Aug 2017

Cited by 7 | Viewed by 2752

Abstract

This paper presents the design and fabrication procedure of a single-element omnidirectional piezoelectric ultrasound transducer, which can be utilized for under water communication. The transducer consists of a spherical silicon infiltrated silicon carbide (Si-SiC) body and is able to perform communication at 160 [...] Read more.

This paper presents the design and fabrication procedure of a single-element omnidirectional piezoelectric ultrasound transducer, which can be utilized for under water communication. The transducer consists of a spherical silicon infiltrated silicon carbide (Si-SiC) body and is able to perform communication at 160 kHz with a Q factor of about 5.6 over a distance of more than one meter. The circumferential pressure amplitude of the beam pattern of the transducer varies less than 10 dB, which allows reliable communication between different transducers at an arbitrary orientation with respect to each other. Full article

(This article belongs to the Proceedings of Proceedings of Eurosensors 2017, Paris, France, 3–6 September 2017)

► Show Figures

Figure 1

5 pages, 1030 KiB

Open AccessProceeding Paper

A Piezoelectric Micromachined Ultrasound Transducers (pMUT) Array, for Wide Bandwidth Underwater Communication Applications

by Sina Sadeghpour, Paulius Pobedinskas, Ken Haenen and Robert Puers

Proceedings 2017, 1(4), 364; https://doi.org/10.3390/proceedings1040364 - 7 Aug 2017

Cited by 10 | Viewed by 3588

Abstract

This paper presents an array of five aluminum nitride (AlN) based piezoelectric micromachined ultrasound transducers (pMUTs) with different dimensions operating at 540–2360 kHz in air. Due to the damping effect of water or oil on the vibration of each individual pMUT, their frequency [...] Read more.

This paper presents an array of five aluminum nitride (AlN) based piezoelectric micromachined ultrasound transducers (pMUTs) with different dimensions operating at 540–2360 kHz in air. Due to the damping effect of water or oil on the vibration of each individual pMUT, their frequency response tends to merge and significantly increases the bandwidth of the pMUTs array. The device is fabricated based on the deep reactive ion etching (DRIE) process on the backside of an SOI wafer to realize the circular diaphragms. Theoretical calculations, measured frequency response, simulation results, and detail of the fabrication are explained in this paper. Full article

(This article belongs to the Proceedings of Proceedings of Eurosensors 2017, Paris, France, 3–6 September 2017)

► Show Figures

Figure 1

4 pages, 875 KiB

Open AccessProceeding Paper

Mechanical Characterization of (La,Sr)MnO₃Microbridges for Thermometric Applications

by Federico Remaggi, Luca Pellegrino, Nicola Manca, Cristina Bernini and Daniele Marré

Proceedings 2017, 1(4), 365; https://doi.org/10.3390/proceedings1040365 - 28 Aug 2017

Cited by 1 | Viewed by 1893

Abstract

MicroElectroMechanical Systems (MEMS) made of heterostructures of crystalline oxide materials with targeted physical properties may be applied as sensors having different integrated functionalities. In this work, we explore the feasibility of manganite thin film based epitaxial MEMS for thermometric micromechanical sensing. We investigate [...] Read more.

MicroElectroMechanical Systems (MEMS) made of heterostructures of crystalline oxide materials with targeted physical properties may be applied as sensors having different integrated functionalities. In this work, we explore the feasibility of manganite thin film based epitaxial MEMS for thermometric micromechanical sensing. We investigate the mechanical properties of La_1−xSr_xMnO₃, with x ≈ 1/3, freestanding microbridges as a function of temperature for applications in the field of micromechanical temperature sensors. Full article

(This article belongs to the Proceedings of Proceedings of Eurosensors 2017, Paris, France, 3–6 September 2017)

► Show Figures

Figure 1

5 pages, 959 KiB

Open AccessProceeding Paper

Thin Film PZT Acoustic Sensor for Fully Implantable Cochlear Implants

by Bedirhan İlik, Aziz Koyuncuoğlu, Hasan Uluşan, Salar Chamanian, Dilek Işık, Özlem Şardan-Sukas and Haluk Külah

Proceedings 2017, 1(4), 366; https://doi.org/10.3390/proceedings1040366 - 22 Aug 2017

Cited by 4 | Viewed by 3480

Abstract

This paper presents design and fabrication of a MEMS-based thin film piezoelectric transducer to be placed on an eardrum for fully-implantable cochlear implant (FICI) applications. Resonating at a specific frequency within the hearing band, the transducer senses eardrum vibration and generates the required [...] Read more.

This paper presents design and fabrication of a MEMS-based thin film piezoelectric transducer to be placed on an eardrum for fully-implantable cochlear implant (FICI) applications. Resonating at a specific frequency within the hearing band, the transducer senses eardrum vibration and generates the required voltage output for the stimulating circuitry. Moreover, high sensitivity of the sensor, 391.9 mV/Pa @900 Hz, decreases the required power for neural stimulation. The transducer provides highest voltage output in the literature (200 mVpp @100 dB SPL) to our knowledge. A multi-frequency piezoelectric sensor, covering the daily acoustic band, is designed based on the test results and validated through FEA. The implemented system provides mechanical filtering, and mimics the natural operation of the cochlea. Herewith, the proposed sensor overcomes the challenges in FICI operations and demonstrates proof-of-concept for next generation FICIs. Full article

(This article belongs to the Proceedings of Proceedings of Eurosensors 2017, Paris, France, 3–6 September 2017)

► Show Figures

Figure 1

4 pages, 368 KiB

Open AccessProceeding Paper

Multiresonator-Based Printable Chipless RFID for Relative Humidity Sensing

by Daniel Dominic, Simon Krafft, Naeem Safdari and Sharmistha Bhadra

Proceedings 2017, 1(4), 367; https://doi.org/10.3390/proceedings1040367 - 7 Aug 2017

Cited by 11 | Viewed by 2533

Abstract

We present a chipless RFID for relative humidity sensing. It consists of three spiral resonators coupled to a 50 Ω microstrip line. One resonator is used for humidity sensing, and the other two are used for encoding ID. The sensing resonator is coated [...] Read more.

We present a chipless RFID for relative humidity sensing. It consists of three spiral resonators coupled to a 50 Ω microstrip line. One resonator is used for humidity sensing, and the other two are used for encoding ID. The sensing resonator is coated with a humidity sensitive polymer film. As the relative humidity changes the permittivity of the polymer film varies changing the resonant frequency of the sensing resonator. Results show that a dedicated resonator can sense relative humidity over 21–53% range with 2.5 MHz/%RH sensitivity whereas the other two resonators can represent the ID. The sensor does not require any IC and is amenable to low-cost production using printed electronic technology. Full article

(This article belongs to the Proceedings of Proceedings of Eurosensors 2017, Paris, France, 3–6 September 2017)

► Show Figures

Figure 1

5 pages, 528 KiB

Open AccessProceeding Paper

Modelling and Experimental Analysis of a Magnetic Material Actuator: Towards Wireless Implantable Devices

by Vinura Jayaneththi, Kean Aw and Andrew McDaid

Proceedings 2017, 1(4), 368; https://doi.org/10.3390/proceedings1040368 - 21 Aug 2017

Cited by 1 | Viewed by 1895

Abstract

This paper presents a wireless diaphragm actuator and focuses on a lumped parameter grey-box model capable of simulating actuation displacement. Here, modelling aims to provide further insight into this smart material actuator and help facilitate design into new implantable applications. Model parameters were [...] Read more.

This paper presents a wireless diaphragm actuator and focuses on a lumped parameter grey-box model capable of simulating actuation displacement. Here, modelling aims to provide further insight into this smart material actuator and help facilitate design into new implantable applications. Model parameters were calibrated to a prototype actuator using experimental data and a genetic algorithm optimisation. The model was validated against experimental data and showed a good ability to simulate both static and dynamic diaphragm displacement. Full article

(This article belongs to the Proceedings of Proceedings of Eurosensors 2017, Paris, France, 3–6 September 2017)

► Show Figures

Figure 1

4 pages, 279 KiB

Open AccessProceeding Paper

Photoelectrical Hydrogen Sensor Based on Pd/Anodic Oxide/InP Structure

by Vadim Shutaev, Albert Imenkov, Elena Grebenshchikova, Valeri Sidorov, Denis Virko, Semen Makarov and Yuri Yakovlev

Proceedings 2017, 1(4), 369; https://doi.org/10.3390/proceedings1040369 - 17 Aug 2017

Viewed by 2042

Abstract

Pd–anodic oxide–InP metal–oxide–semiconductor (MOS) structures are fabricated to develop a hydrogen sensor capable of effectively operating at room temperature. Through palladium amount varying the signal recovery time has been improved (became shorter). Decrease of photovoltage and strong increase of photocurrent were observed for [...] Read more.

Pd–anodic oxide–InP metal–oxide–semiconductor (MOS) structures are fabricated to develop a hydrogen sensor capable of effectively operating at room temperature. Through palladium amount varying the signal recovery time has been improved (became shorter). Decrease of photovoltage and strong increase of photocurrent were observed for illuminated by LED structures under hydrogen pulse exposure. The gas testing was carried out in 0.1–10% hydrogen in nitrogen, and in 100% hydrogen. As a result, low power-consumption hydrogen sensor with a fast response-recovery time 1/20 s. was developed. Full article

(This article belongs to the Proceedings of Proceedings of Eurosensors 2017, Paris, France, 3–6 September 2017)

► Show Figures

Figure 1

5 pages, 1305 KiB

Open AccessProceeding Paper

Pulse Wave Monitoring for Arterial Stiffness Detection Using a Simple Portable Tonometer

by Gaëlle Lissorgues, Alexandre Bongrain, Lionel Rousseau, Nadia Madaoui, Amandine Testi, Laurie Valbin, Sébastien Moussay and Pierre-Alexandre Chapon

Proceedings 2017, 1(4), 370; https://doi.org/10.3390/proceedings1040370 - 24 Aug 2017

Viewed by 2539

Abstract

The work presented in this paper concerns the design, fabrication and test of a simple portable device able to measure in real time the cardiac frequency and the pulse wave, plus the pulse velocity in specific conditions (carotid and femoral locations). The sensing [...] Read more.

The work presented in this paper concerns the design, fabrication and test of a simple portable device able to measure in real time the cardiac frequency and the pulse wave, plus the pulse velocity in specific conditions (carotid and femoral locations). The sensing part is based on a thin film technology embedded in polymer and the data processing part is based on a classical pre-amplifying circuit associated with digitalization and shape detection algorithm. The whole device has been chosen as one demonstrator in the EveryWear project of the PROXIMA mission launched by the European Space Agency, the France’s space agency CNES with space medicine specialists MEDES, to estimate the arterial stiffness variations under microgravity conditions and weightlessness. Raw data are stored through the remote tablet application and will be later processed using Matlab. Full article

(This article belongs to the Proceedings of Proceedings of Eurosensors 2017, Paris, France, 3–6 September 2017)

► Show Figures

Figure 1

5 pages, 1209 KiB

Open AccessProceeding Paper

Piezo Resistive Read-Out Contact Resonance Spectroscopy for Material and Layer Analysis at High-Aspect-Ratio Geometries

by Maik Bertke, Uili Wobeto Reinheimer, Michael Fahrbach, Gerry Hamdana, Hutomo Suryo Wasisto and Erwin Peiner

Proceedings 2017, 1(4), 371; https://doi.org/10.3390/proceedings1040371 - 24 Aug 2017

Cited by 1 | Viewed by 2877

Abstract

A piezo resistive, phase locked loop (PLL) controlled micro tactile measurement system for contact resonance spectroscopy (CRS) at high-aspect-ratio geometries was developed and characterised. Therefore, a piezo resistive silicon cantilever with a silicon tip at its free end was brought into contact with [...] Read more.

A piezo resistive, phase locked loop (PLL) controlled micro tactile measurement system for contact resonance spectroscopy (CRS) at high-aspect-ratio geometries was developed and characterised. Therefore, a piezo resistive silicon cantilever with a silicon tip at its free end was brought into contact with a sample surface and excited into resonance by a piezo actuator. The resonance frequency of the contacted cantilever was tracked by a homemade closed-loop PLL circuit. Different materials and layer thicknesses of photo resist (PR) on silicon were used to validate the system. To optimise the sensitivity and efficiency of the measurement system, amplitude and phase of the cantilever in surface contact were analysed under different contact forces and excitation amplitudes. Full article

(This article belongs to the Proceedings of Proceedings of Eurosensors 2017, Paris, France, 3–6 September 2017)

► Show Figures

Figure 1

5 pages, 536 KiB

Open AccessProceeding Paper

Design, Modeling, and Characterization of a Bionically Inspired Integrated Micro-Flapper for Cooling and Venting Applications

by Regine Behlert, Matthias Gehring, Hannes Mehner, Robert Wieland and Gabriele Schrag

Proceedings 2017, 1(4), 372; https://doi.org/10.3390/proceedings1040372 - 23 Aug 2017

Cited by 1 | Viewed by 1836

Abstract

A novel, integrated micromechanical actuator based on the principle of undulatory fish locomotion and intended for efficient on-chip cooling or venting applications is conceived and designed for an aluminum nitride-based thin-film technology applying coupled piezoelectric, mechanical, and fluidic analyses. The results of the [...] Read more.

A novel, integrated micromechanical actuator based on the principle of undulatory fish locomotion and intended for efficient on-chip cooling or venting applications is conceived and designed for an aluminum nitride-based thin-film technology applying coupled piezoelectric, mechanical, and fluidic analyses. The results of the investigations prove that an undulatory motion of the fin-like micro-flapper yields a significant higher, directed fluidic net flow compared to resonant-like motion. First prototypes have been manufactured and characterized applying laser Doppler vibrometry (LDV). Full article

(This article belongs to the Proceedings of Proceedings of Eurosensors 2017, Paris, France, 3–6 September 2017)

► Show Figures

Figure 1

4 pages, 509 KiB

Open AccessProceeding Paper

Impact of High Coupling Factor in Absolute Distance Measurement with Self-Mixing Interferometry

by Mengkoung Veng, Julien Perchoux and Francis Bony

Proceedings 2017, 1(4), 373; https://doi.org/10.3390/proceedings1040373 - 16 Aug 2017

Cited by 3 | Viewed by 2006

Abstract

Absolute distance measurement by means of a self-mixing interferometer (SMI) can be obtained by modulating the laser frequency. This modulation is typically achieved through the modulation of the laser injection current with a triangle waveform. Various strategies have been proposed to increase the [...] Read more.

Absolute distance measurement by means of a self-mixing interferometer (SMI) can be obtained by modulating the laser frequency. This modulation is typically achieved through the modulation of the laser injection current with a triangle waveform. Various strategies have been proposed to increase the performances and recent researches have shown real-time performance of SMI with resolution reaching 100 μm for distances up to 2 m. In the present paper, we demonstrate for the first time, both experimentally and by modeling, that with high coupling factors between the laser and the target, disappearance of interferometric fringes occurs that can strongly affect the measurement reliability. Full article

(This article belongs to the Proceedings of Proceedings of Eurosensors 2017, Paris, France, 3–6 September 2017)

► Show Figures

Figure 1

5 pages, 1316 KiB

Open AccessProceeding Paper

On-Chip Platform for Slack-Free Carbon Nanotube Resonators

by Lalit Kumar, Laura Vera Jenni, Cosmin Ioan Roman and Christofer Hierold

Proceedings 2017, 1(4), 374; https://doi.org/10.3390/proceedings1040374 - 8 Aug 2017

Cited by 2 | Viewed by 2337

Abstract

This work describes an on-chip integrated micro-actuator device for slack-free carbon nanotube (CNT) resonators, improving frequency tunability and Q factor and to study non-linear mode interaction. The device fabricated on SOI wafer with low thermal budget (<600 K) encompasses a restricted symmetrical out-of-plane [...] Read more.

This work describes an on-chip integrated micro-actuator device for slack-free carbon nanotube (CNT) resonators, improving frequency tunability and Q factor and to study non-linear mode interaction. The device fabricated on SOI wafer with low thermal budget (<600 K) encompasses a restricted symmetrical out-of-plane vibration and a stiff in-plane electro-thermal actuator with a displacement of ~112 nm at 2.7 mW. This corresponds to 5.6% of strain for a 2 μm long suspended carbon nanotube. The in-plane mechanical resonance designed to be far from CNT resonances in MHz regime is measured at 209 kHz. The design is optimized for low power consumption, electrical and thermal isolation and is customized for dry transfer of CNTs. Full article

(This article belongs to the Proceedings of Proceedings of Eurosensors 2017, Paris, France, 3–6 September 2017)

► Show Figures

Figure 1

5 pages, 524 KiB

Open AccessProceeding Paper

Nanomechanical Traceable Metrology of Vertically Aligned Silicon and Germanium Nanowires by Nanoindentation

by Gerry Hamdana, Tony Granz, Maik Bertke, Zhi Li, Prabowo Puranto, Uwe Brand, Hutomo Suryo Wasisto and Erwin Peiner

Proceedings 2017, 1(4), 375; https://doi.org/10.3390/proceedings1040375 - 9 Aug 2017

Cited by 1 | Viewed by 3028

Abstract

Silicon and germanium pillar structures (i.e., micro- and nanowires) were fabricated by a top-down approach including nanoimprint lithography and cryogenic dry etching. Various etching parameters were tested to ensure a reliable fabrication process. The impression of nanomechanical properties of such 3-D structures were [...] Read more.

Silicon and germanium pillar structures (i.e., micro- and nanowires) were fabricated by a top-down approach including nanoimprint lithography and cryogenic dry etching. Various etching parameters were tested to ensure a reliable fabrication process. The impression of nanomechanical properties of such 3-D structures were extracted experimentally by nanoindentation showing promising and comparative results to utilize such nanostructures as small force artefacts. Full article

(This article belongs to the Proceedings of Proceedings of Eurosensors 2017, Paris, France, 3–6 September 2017)

► Show Figures

Figure 1

5 pages, 612 KiB

Open AccessProceeding Paper

Wall Shear Stress Calorimetric Micro-Sensor Designed for Flow Separation Detection and Active Flow Control

by Cécile Ghouila-Houri, Quentin Gallas, Eric Garnier, Alain Merlen, Romain Viard, Abdelkrim Talbi and Philippe Pernod

Proceedings 2017, 1(4), 376; https://doi.org/10.3390/proceedings1040376 - 9 Aug 2017

Cited by 3 | Viewed by 1955

Abstract

This paper presents an efficient and high-sensitive micro-sensor designed for wall shear stress measurement. The main technical application targeted is flow separation detection for closed-loop active flow control. The sensor is a temperature-resistance transducer operating on heat transfer. The device is micro-structured with [...] Read more.

This paper presents an efficient and high-sensitive micro-sensor designed for wall shear stress measurement. The main technical application targeted is flow separation detection for closed-loop active flow control. The sensor is a temperature-resistance transducer operating on heat transfer. The device is micro-structured with three substrate-free wires presenting a high aspect ratio, and periodic perpendicular micro-bridges ensuring mechanical toughness and thermal insulation. This design achieves a homogeneous temperature distribution along the wires. Welded on a flexible printed circuit, the sensor is wall-mounted on a wind tunnel. The experiments, conducted in both attached and separated flow configurations, demonstrate the sensor sensitivity to wall shear stress up to 2.4 Pa and the ability of the 3-wires based design to perform flow direction sensing for back-flow detection. Full article

(This article belongs to the Proceedings of Proceedings of Eurosensors 2017, Paris, France, 3–6 September 2017)

► Show Figures

Figure 1

5 pages, 721 KiB

Open AccessProceeding Paper

Nanogap Pirani Sensor Operating in Constant Temperature Mode for Near Atmospheric Pressure Measurements

by Cécile Ghouila-Houri, Ralph Sindjui, Mohammed Moutaouekkil, Omar Elmazria, Quentin Gallas, Eric Garnier, Alain Merlen, Romain Viard, Abdelkrim Talbi and Philippe Pernod

Proceedings 2017, 1(4), 377; https://doi.org/10.3390/proceedings1040377 - 5 Sep 2017

Cited by 2 | Viewed by 2360

Abstract

This paper presents a high sensitive micro-sensor designed for pressure measurements in a wide range around atmospheric pressure, for application in aerodynamics. The sensor is a temperature-resistance transducer operating with the Pirani effect, which states that below a certain pressure limit, the thermal [...] Read more.

This paper presents a high sensitive micro-sensor designed for pressure measurements in a wide range around atmospheric pressure, for application in aerodynamics. The sensor is a temperature-resistance transducer operating with the Pirani effect, which states that below a certain pressure limit, the thermal conductivity of a gas is pressure-dependent. The sensor presents a wide measurement range between 10 kPa and about 800 kPa, in both constant current and constant temperature mode. The last mode enables high-sensitive measurements with a maximum of sensitivity around atmospheric pressure, enabling the use of the sensor for applications in aerodynamics and fluid dynamics, such as active flow control. Full article

(This article belongs to the Proceedings of Proceedings of Eurosensors 2017, Paris, France, 3–6 September 2017)

► Show Figures

Figure 1

4 pages, 486 KiB

Open AccessProceeding Paper

Neutral Argon Plasma in Minimally Invasive Medical Devices for Therapy

by Jose A. Rodrigues, Manuel F. Silva and J. H. Correia

Proceedings 2017, 1(4), 378; https://doi.org/10.3390/proceedings1040378 - 11 Aug 2017

Cited by 1 | Viewed by 2151

Abstract

This paper presents a solution to implement neutral argon plasma (NAP) in minimally invasive medical devices (MIMD) for therapy in endoscopy. The NAP system is composed by compressed inert gas (argon), two electrodes and a high-voltage source to ionize the argon. The miniaturization [...] Read more.

This paper presents a solution to implement neutral argon plasma (NAP) in minimally invasive medical devices (MIMD) for therapy in endoscopy. The NAP system is composed by compressed inert gas (argon), two electrodes and a high-voltage source to ionize the argon. The miniaturization of an argon reservoir is required. The finite element method simulation of a small reservoir of 304 L stainless steel with 0.2 mm thick at 7 atm of pressure was performed. The results show maximum total deformation of 40 μm and maximum equivalent stress of 160 MPa, with no permanent deformation of argon reservoir. Full article

(This article belongs to the Proceedings of Proceedings of Eurosensors 2017, Paris, France, 3–6 September 2017)

► Show Figures

Figure 1

5 pages, 526 KiB

Open AccessProceeding Paper

High Accuracy MEMS Pressure Sensor Based on Quartz Crystal Resonator

by J. Wang, C. Zhao, D. X. Han, X. F. Jin, S. M. Zhang, J. B. Zou, M. M. Wang, W. B. Li and Y. B. Guo

Proceedings 2017, 1(4), 379; https://doi.org/10.3390/proceedings1040379 - 11 Aug 2017

Cited by 7 | Viewed by 2645

Abstract

This paper reports a high accuracy oil-filled MEMS absolute pressure sensor based on quartz crystal double-ended tuning fork (DETF) resonator, which is suitable for application in ocean, petroleum, meteorological, aerospace and spacecraft field, etc. The pressure sensing unit is mainly composed of DETF [...] Read more.

This paper reports a high accuracy oil-filled MEMS absolute pressure sensor based on quartz crystal double-ended tuning fork (DETF) resonator, which is suitable for application in ocean, petroleum, meteorological, aerospace and spacecraft field, etc. The pressure sensing unit is mainly composed of DETF resonator, diaphragm and back cavity structure. These pieces are all fabricated by quartz crystal using MEMS process, and are bonded together as ‘sandwich’ structure to form the absolute pressure sensing unit using glass frit under low temperature and vacuum condition. This process could effectively eliminate the thermal stress effect and form the reference vacuum cavity. The isolated packaged pressure sensor is composed of corrugated stainless steel diaphragm, silicone oil, pressure sensing unit and ceramic base package. The experimental results show that the accuracy is up to ±0.033% FS in the pressure range 0~300 kPa over the temperature range −20 °C~+45 °C. Full article

(This article belongs to the Proceedings of Proceedings of Eurosensors 2017, Paris, France, 3–6 September 2017)

► Show Figures

Figure 1

5 pages, 1544 KiB

Open AccessProceeding Paper

Tuneable Q-Factor of MEMS Cantilevers with Integrated Piezoelectric Thin Films

by Martin Fischeneder, Martin Oposich, Michael Schneider and Ulrich Schmid

Proceedings 2017, 1(4), 380; https://doi.org/10.3390/proceedings1040380 - 21 Aug 2017

Cited by 1 | Viewed by 1912

Abstract

When targeting the integration of atomic force microscopes (AFM) into vacuum environments (e.g., scanning electron microscopes), a tunable Q-factor of the resonating AFM cantilever is a key feature to enable high speed measurements with high local resolution. To achieve this goal, an additional [...] Read more.

When targeting the integration of atomic force microscopes (AFM) into vacuum environments (e.g., scanning electron microscopes), a tunable Q-factor of the resonating AFM cantilever is a key feature to enable high speed measurements with high local resolution. To achieve this goal, an additional stimulus is applied to the cantilever with respect to the mechanical stimulus provided by the macroscopic piezoelectric actuator. This additional stimulus is generated by an aluminium nitride based piezoelectric actuator integrated on the cantilever, which is driven by a phase shifted excitation. With this approach, the mechanical Q-factor measured with a laser Doppler vibrometer (LDV) in vacuum is electrically decreased by a factor of up to 1.7. Full article

(This article belongs to the Proceedings of Proceedings of Eurosensors 2017, Paris, France, 3–6 September 2017)

► Show Figures

Figure 1

5 pages, 1018 KiB

Open AccessProceeding Paper

Effect of Electrode Configuration on High Temperature Thickness Shear Gallium Phosphate Transducer

by Anurag Dhutti, Tat-Hean Gan, Abbas Mohimi, Wamadeva Balachandran and Jamil Kanfoud

Proceedings 2017, 1(4), 381; https://doi.org/10.3390/proceedings1040381 - 25 Aug 2017

Viewed by 1932

Abstract

Gallium phosphate single crystal has a very stable thermal response, ideal for high temperature applications such as transducers for in-service monitoring of HT infrastructure in Power and Oil & Gas industries. Broadband transducers are designed to resonate with a specific mode of vibration [...] Read more.

Gallium phosphate single crystal has a very stable thermal response, ideal for high temperature applications such as transducers for in-service monitoring of HT infrastructure in Power and Oil & Gas industries. Broadband transducers are designed to resonate with a specific mode of vibration within a frequency range of interest. This desired frequency response depends on how the transducer is mounted on the structure and the target defect sensitivity. Electrode configurations are defined to achieve the transducer design. This study investigates the parallel and wrap-around electrode configurations on the transducer response. An electro-mechanical finite element model was developed to analyse the transducer response and predicted a disparity in the modes of vibration between the two configurations within the same frequency range. This model was experimentally validated by measuring the displacement patterns using 3D Laser Doppler Vibrometry. Full article

(This article belongs to the Proceedings of Proceedings of Eurosensors 2017, Paris, France, 3–6 September 2017)

► Show Figures

Figure 1

4 pages, 391 KiB

Open AccessProceeding Paper

High Sensitivity Ultraviolet Light Off-Stoichiometric Silicon Oxide-Based Sensors

by Jesús Carrillo, José Alberto Luna, Godofredo García and Héctor Juárez

Proceedings 2017, 1(4), 382; https://doi.org/10.3390/proceedings1040382 - 25 Aug 2017

Viewed by 1849

Abstract

We have developed a UV silicon detector made of silicon and off-stoichiometric silicon dioxide that shows high efficiency and is completely compatible with silicon devices technology. The silicon-based UV detector present a solar cell-like structure which does not require any voltage source. In [...] Read more.

We have developed a UV silicon detector made of silicon and off-stoichiometric silicon dioxide that shows high efficiency and is completely compatible with silicon devices technology. The silicon-based UV detector present a solar cell-like structure which does not require any voltage source. In addition, an off-stoichiometric silicon dioxide film (Silicon Rich Oxide) with silicon nanocrystals has been integrated to this structure. It is shown that the spectral response is due to the high photoluminescence of Si nanocrystals in the visible region when illuminated with UV light and an increase of 100% in the UV detector efficiency is observed with respect to conventional silicon dioxide layers. Full article

(This article belongs to the Proceedings of Proceedings of Eurosensors 2017, Paris, France, 3–6 September 2017)

► Show Figures

Figure 1

4 pages, 1275 KiB

Open AccessProceeding Paper

Servo-Assisted Position-Feedback MEMS Force Sensor with Tunable Sensitivity and Sub-Nanonewton Range

by Alessandro Nastro, Marco Ferrari, Alfio-Lip Russo, Raffaele Ardito and Vittorio Ferrari

Proceedings 2017, 1(4), 383; https://doi.org/10.3390/proceedings1040383 - 28 Aug 2017

Cited by 2 | Viewed by 2169

Abstract

A Micro Electro-Mechanical System (MEMS) that allows to measure an external force applied to a probe tip exploiting an electrical servo-assisted mechanism based on position feedback is presented. The sensor architecture keeps the position of the probe tip fixed by driving a pair [...] Read more.

A Micro Electro-Mechanical System (MEMS) that allows to measure an external force applied to a probe tip exploiting an electrical servo-assisted mechanism based on position feedback is presented. The sensor architecture keeps the position of the probe tip fixed by driving a pair of variable-area electrostatic actuators in a feedback loop controlled by a variable-gap capacitive sensor. By adjusting specific loop parameters, the force sensitivity can be finely tuned electrically. Sub-nanonewton measurement range is achieved with high flexibility in setting the tip working point, making the system promising for measuring forces generated by living biological cells. Full article

(This article belongs to the Proceedings of Proceedings of Eurosensors 2017, Paris, France, 3–6 September 2017)

► Show Figures

Figure 1

4 pages, 595 KiB

Open AccessProceeding Paper

Investigation on the Influence of Solvents on MWCNT-PDMS Nanocomposite Pressure Sensitive Films

by Rajarajan Ramalingame, Pritha Chandraker and Olfa Kanoun

Proceedings 2017, 1(4), 384; https://doi.org/10.3390/proceedings1040384 - 16 Aug 2017

Cited by 12 | Viewed by 3385

Abstract

Nanocomposites based on Multi-Walled Carbon Nanotubes (MWCNT)—Polydimethylsiloxane (PDMS) polymer achieve pressure sensors sensitive even at very low pressure less than 5 N. For film homogeneity and sensitivity, fabrication procedure and especially the dispersion quality are decisive. Because of high viscosity of PDMS, a [...] Read more.

Nanocomposites based on Multi-Walled Carbon Nanotubes (MWCNT)—Polydimethylsiloxane (PDMS) polymer achieve pressure sensors sensitive even at very low pressure less than 5 N. For film homogeneity and sensitivity, fabrication procedure and especially the dispersion quality are decisive. Because of high viscosity of PDMS, a solvent is necessary. Solvents exhibit themselves different dispersion quality and in turn different piezoresistive response of the films under pressure. In this paper, the influence of solvents in fabricating the nanocomposite is investigated considering dispersion quality and stability. The best dispersion stability was achieved with isopropanol and the nanocomposite show better results considering sensitivity and hysteresis behavior under pressure. Full article

(This article belongs to the Proceedings of Proceedings of Eurosensors 2017, Paris, France, 3–6 September 2017)

► Show Figures

Figure 1

5 pages, 2281 KiB

Open AccessProceeding Paper

Micro-Grippers with Femtosecond-Laser Machined In-Plane Agonist-Antagonist SMA Actuators Integrated on Wafer-Level by Galvanic Riveting

by Mayra Garcés-Schröder, Lars Hecht, Anke Vierheller, Monika Leester-Schädel, Markus Böl and Andreas Dietzel

Proceedings 2017, 1(4), 385; https://doi.org/10.3390/proceedings1040385 - 4 Aug 2017

Cited by 10 | Viewed by 2811

Abstract

In-plane shape memory alloy (SMA) actuators operated in agonist-antagonist mode are integrated on silicon micro-grippers. The actuator elements are cut out of sheet material in a femtosecond laser ablation process. The assembly process is carried out on wafer-level, and the fixation realized by [...] Read more.

In-plane shape memory alloy (SMA) actuators operated in agonist-antagonist mode are integrated on silicon micro-grippers. The actuator elements are cut out of sheet material in a femtosecond laser ablation process. The assembly process is carried out on wafer-level, and the fixation realized by galvanic riveting. The initial deformation of the differential actuators needed to access their actuation potential is implemented during the gripper connection to energy supply. Full article

(This article belongs to the Proceedings of Proceedings of Eurosensors 2017, Paris, France, 3–6 September 2017)

► Show Figures

Figure 1

5 pages, 975 KiB

Open AccessProceeding Paper

Development of a MEMS Plate Based on Thin-Film Piezoelectric AlN Actuators for Biological Applications

by Baptiste Neff, Fabrice Casset, Arnaud Millet, Vincent Agache, Nicolas Verplanck, François Boizot and Stéphane Fanget

Proceedings 2017, 1(4), 386; https://doi.org/10.3390/proceedings1040386 - 9 Aug 2017

Cited by 1 | Viewed by 2197

Abstract

This paper presents the development of a lab-on-chip system based on the use of local vibrations to mechanically stimulate biological materials. It reports on the development and characterization of a piezoelectric actuators driven system designed to operate in liquid media. The microfluidic packaging [...] Read more.

This paper presents the development of a lab-on-chip system based on the use of local vibrations to mechanically stimulate biological materials. It reports on the development and characterization of a piezoelectric actuators driven system designed to operate in liquid media. The microfluidic packaging of the Micro Electro Mechanical System (MEMS) is first presented. Then, electromechanical measurements done to calibrate our system are compared with Finite Element Method (FEM) simulations. These results are the first steps for implementation of piezoelectric MEMS to study mechanical response of biological cells at the population level. Full article

(This article belongs to the Proceedings of Proceedings of Eurosensors 2017, Paris, France, 3–6 September 2017)

► Show Figures

Figure 1

5 pages, 2506 KiB

Open AccessProceeding Paper

Soft Triboelectric Band for Sensing of and Energy Scavenging From Body Motion

by Rubaiyet Iftekharul Haque, Pierre-André Farine and Danick Briand

Proceedings 2017, 1(4), 387; https://doi.org/10.3390/proceedings1040387 - 9 Aug 2017

Cited by 1 | Viewed by 1914

Abstract

We manifest a new method of developing wearable triboelectric band for self-powerd gesture sensing and power generating. Film casting technique, that is easily scalable, was used to patterned soft stretchable elastomers and conductive carbon based composites. The developed triboelectric band showed the capabilities [...] Read more.

We manifest a new method of developing wearable triboelectric band for self-powerd gesture sensing and power generating. Film casting technique, that is easily scalable, was used to patterned soft stretchable elastomers and conductive carbon based composites. The developed triboelectric band showed the capabilities of detecting locomotion of elbow and knee movement and provides electrical signal in response. The rms voltage, current and power of 2.9 V, 0.3 μA and 1.6 μW for elbow stretching, and 1.1 V, 0.11 μA and 0.22 μW for knee stretching was obtained for the optimum load of 10.1 MΩ at operational frequency of 1 ± 0.1 Hz. Full article

(This article belongs to the Proceedings of Proceedings of Eurosensors 2017, Paris, France, 3–6 September 2017)

► Show Figures

Figure 1

4 pages, 1434 KiB

Open AccessProceeding Paper

A Spherical Directional Anemometer Sensor System

by Alfiero Leoni, Gianluca Barile, Mirco Muttillo, Leonardo Pantoli, Vincenzo Stornelli, Giuseppe Ferri, R. Paolucci and L. Di Vita

Proceedings 2017, 1(4), 388; https://doi.org/10.3390/proceedings1040388 - 4 Aug 2017

Cited by 4 | Viewed by 1933

Abstract

In this work, the authors propose a novel directional anemometric system, showing a compact design and the absence of external mechanical moving parts. The measuring principle is based on a dual channel spherical wind conveyor structure, combined with a pressure difference sensing technique [...] Read more.

In this work, the authors propose a novel directional anemometric system, showing a compact design and the absence of external mechanical moving parts. The measuring principle is based on a dual channel spherical wind conveyor structure, combined with a pressure difference sensing technique of the conveyed air flows by the employment of electromagnetic inductive transducers. Full article

(This article belongs to the Proceedings of Proceedings of Eurosensors 2017, Paris, France, 3–6 September 2017)

► Show Figures

Figure 1

4 pages, 634 KiB

Open AccessProceeding Paper

Study of Elongation and Temperature Effects on Nanocomposite Based on Elastic Fiber

by Renato Torres, Adytia Jalasutram, Abderrahmane Benchirouf, Christian Müller and Olfa Kanoun

Proceedings 2017, 1(4), 389; https://doi.org/10.3390/proceedings1040389 - 7 Aug 2017

Viewed by 2099

Abstract

Stretchable sensors are increasingly demanded in the fields of smart textiles for sports, military and medical industry. In this work, we propose novel elongation sensitive elastic fibers made up of Multi-Walled Carbon Nanotubes (MWCNT), Polyester and Polyurethane. The entire fiber is encased with [...] Read more.

Stretchable sensors are increasingly demanded in the fields of smart textiles for sports, military and medical industry. In this work, we propose novel elongation sensitive elastic fibers made up of Multi-Walled Carbon Nanotubes (MWCNT), Polyester and Polyurethane. The entire fiber is encased with natural rubber (NR) for protection against mechanical, electrical and humidity external influences. With this fiber, it is possible to reach elongations above 100%. It can be fabricated in different sizes according to application requirements. The relationship between fiber resistance and its physical modifications was measured at different elongations and temperatures. The experimental results show a high sensitivity and a stable temperature behavior. Full article

(This article belongs to the Proceedings of Proceedings of Eurosensors 2017, Paris, France, 3–6 September 2017)

► Show Figures

Figure 1

4 pages, 1019 KiB

Open AccessProceeding Paper

Linear Position Sensing through Conductive Wall without Permanent Magnet

by Jan Vyhnanek, Pavel Ripka and Andrey Chirtsov

Proceedings 2017, 1(4), 390; https://doi.org/10.3390/proceedings1040390 - 8 Aug 2017

Cited by 3 | Viewed by 2054

Abstract

A linear position sensor for pneumatic actuators is presented. Position of the piston rod made of ferromagnetic material is detected by low frequency magnetic field which penetrates the aluminum wall of the cylinder. The sensor consists of an array of integrated fluxgate sensors [...] Read more.

A linear position sensor for pneumatic actuators is presented. Position of the piston rod made of ferromagnetic material is detected by low frequency magnetic field which penetrates the aluminum wall of the cylinder. The sensor consists of an array of integrated fluxgate sensors and two excitation saddle coils mounted outside the actuator. The method does not need a permanent magnet attached to the piston as required by common magnetic position sensors. Full article

(This article belongs to the Proceedings of Proceedings of Eurosensors 2017, Paris, France, 3–6 September 2017)

► Show Figures

Figure 1

5 pages, 3356 KiB

Open AccessProceeding Paper

Low Impedance ALD HfO₂ Partially-Filled-Gap Flexural and Bulk MEMS Resonators Piezoresistively Detected for Distributed Mass Sensing

by Mariazel Maqueda Lopez, Emanuele Andrea Casu, Montserrat Fernandez-Bolanos and Adrian Mihai Ionescu

Proceedings 2017, 1(4), 391; https://doi.org/10.3390/proceedings1040391 - 9 Aug 2017

Cited by 1 | Viewed by 1860

Abstract

This paper reports the design and characterization of partially-filled-gap capacitive MEMS resonators for distributed mass sensing applications. By filling the gap with HfO₂, the coupling coefficient between electrode-resonator increases by ×6.67 times and the motional resistance decreases by ×12 times in [...] Read more.

This paper reports the design and characterization of partially-filled-gap capacitive MEMS resonators for distributed mass sensing applications. By filling the gap with HfO₂, the coupling coefficient between electrode-resonator increases by ×6.67 times and the motional resistance decreases by ×12 times in comparison with its counterpart in air. An improvement by a factor of ×5.6 in the Signal-To-Noise Ratio (SNR) for DC bias up to ×2.8 lower is accomplished by performing a piezoresistive detection instead of capacitive detection. Quality factor (Q) of 11,350 and motional resistances (R_m) of 926 Ω have been achieved for Parallel Beam Resonators (PBR) vibrating at 22.231 MHz. For the first time, ALD HfO₂ partially-filled-gap MEMS resonators are proven to achieve inertial distributed mass sensitivities of the order of 4.28 kHz/pg for beam-type and 1.8k Hz/pg for disk resonators. Full article

(This article belongs to the Proceedings of Proceedings of Eurosensors 2017, Paris, France, 3–6 September 2017)

► Show Figures

Figure 1

5 pages, 1086 KiB

Open AccessProceeding Paper

Piezoelectric Actuators for In-Liquid Particle Manipulation in Microfluidic Applications

by Marco Demori, Marco Baù, Simone Dalola, Marco Ferrari and Vittorio Ferrari

Proceedings 2017, 1(4), 392; https://doi.org/10.3390/proceedings1040392 - 8 Aug 2017

Cited by 1 | Viewed by 2182

Abstract

The possibility to generate acoustic modes based on FPWs (Flexural Plate Waves) in a generic non-piezoelectric substrate for microfludic applications by means of piezoelectric actuators has been explored and described in this paper. The FPW acoustic modes are generated by means of actuators [...] Read more.

The possibility to generate acoustic modes based on FPWs (Flexural Plate Waves) in a generic non-piezoelectric substrate for microfludic applications by means of piezoelectric actuators has been explored and described in this paper. The FPW acoustic modes are generated by means of actuators made of Lead Zirconate Titanate (PZT) layers with InterDigital Transducers (IDTs) screen-printed on alumina (Al₂O₃) substrate. The experimental results show that, by exciting the resonances of the actuators, circular vortex rotations are obtained in a fluid drop placed on the substrate between the IDTs. Micrometric particles dispersed in the drop allow to demonstrate that standing waves can be generated in the liquid obtaining particle accumulation along circular lines. These results suggest the possibility to employ the proposed actuators for fluid mixing and controlled positioning of dispersed particles. Full article

(This article belongs to the Proceedings of Proceedings of Eurosensors 2017, Paris, France, 3–6 September 2017)

► Show Figures

Figure 1

5 pages, 977 KiB

Open AccessProceeding Paper

The First Frequency-Modulated (FM) Pitch Gyroscope

by Valentina Zega, Paolo Minotti, Giorgio Mussi, Alessandro Tocchio, Luca Falorni, Stefano Facchinetti, Andrea Bonfanti, Andrea L. Lacaita, Claudia Comi, Giacomo Langfelder and Alberto Corigliano

Proceedings 2017, 1(4), 393; https://doi.org/10.3390/proceedings1040393 - 8 Aug 2017

Cited by 4 | Viewed by 2219

Abstract

In this work, the mechanical design and the experimental validation of a micro-electromechanical frequency-modulated (FM) pitch gyroscope are presented. The proposed device is fabricated through the ThELMA © surface micromachining process of STMicroelectronics and it represents, to the authors’ knowledge, the first small-footprint [...] Read more.

In this work, the mechanical design and the experimental validation of a micro-electromechanical frequency-modulated (FM) pitch gyroscope are presented. The proposed device is fabricated through the ThELMA © surface micromachining process of STMicroelectronics and it represents, to the authors’ knowledge, the first small-footprint (690 µm × 946 µm) prototype of FM gyroscope able to measure an in-plane angular rate. The measured scale factor, defined as the mean angular gain, equals 0.973 Hz/Hz, in close agreement with theoretical predictions. It depends only on the mass distribution in the mechanical structure and is, consequently, not influenced by environmental fluctuations. Full article

(This article belongs to the Proceedings of Proceedings of Eurosensors 2017, Paris, France, 3–6 September 2017)

► Show Figures

Figure 1

5 pages, 530 KiB

Open AccessProceeding Paper

Sensitivity of Piezoelectric Ultrasonic Microsensors with Sol-Gel Derived PZT Films Prepared through Various Pyrolysis Temperatures

by Kaoru Yamashita, Shota Nakajima, Jo Shiomi and Minoru Noda

Proceedings 2017, 1(4), 394; https://doi.org/10.3390/proceedings1040394 - 11 Aug 2017

Cited by 1 | Viewed by 2103

Abstract

Sensitivity of piezoelectric-diaphragm type ultrasonic microsensors were investigated with sol-gel derived lead-zirconate-titanate (PZT) films prepared through various pyrolysis temperatures. The residual stress of the PZT film should be precisely controlled because the sensor diaphragms show static deflection by buckling and highly sensitive sensors [...] Read more.

Sensitivity of piezoelectric-diaphragm type ultrasonic microsensors were investigated with sol-gel derived lead-zirconate-titanate (PZT) films prepared through various pyrolysis temperatures. The residual stress of the PZT film should be precisely controlled because the sensor diaphragms show static deflection by buckling and highly sensitive sensors have been realized on upward-buckled diaphragms whose buckling direction and deflection are determined by the stress. The films were prepared under pyrolysis temperatures in the range from 250 °C to 400 °C and for (100)- or (111)-orientation. Higher pyrolysis temperature resulted in lower film stress and larger buckling deflection of the diaphragms. The (111)-oriented films showed the higher sensitivity in the higher pyrolysis temperatures. The (100)-oriented films, however, showed the highest sensitivity in the lowest pyrolysis temperature (250 °C). Full article

(This article belongs to the Proceedings of Proceedings of Eurosensors 2017, Paris, France, 3–6 September 2017)

► Show Figures

Figure 1

5 pages, 944 KiB

Open AccessProceeding Paper

Contactless Interrogation System for Capacitive Sensors with Time-Gated Technique

by Mehedi Masud, Marco Baù, Marco Demori, Marco Ferrari and Vittorio Ferrari

Proceedings 2017, 1(4), 395; https://doi.org/10.3390/proceedings1040395 - 8 Aug 2017

Cited by 2 | Viewed by 2248

Abstract

This paper presents a measurement technique and system for the contactless interrogation of capacitive sensors via electromagnetic coupling. The interrogation unit employs a primary coil to periodically excite the capacitive sensor connected to a secondary coil forming an LC resonant circuit. When the [...] Read more.

This paper presents a measurement technique and system for the contactless interrogation of capacitive sensors via electromagnetic coupling. The interrogation unit employs a primary coil to periodically excite the capacitive sensor connected to a secondary coil forming an LC resonant circuit. When the excitation to the primary coil is switched off the damped response of the LC circuit is detected. As a fundamental advantage compared to techniques based on reflected impedance, this approach ensures that the readout frequency is to first order independent of the interrogation distance between the two coils. The system has been tested with reference capacitors and with a capacitive liquid level sensor. The experimental results are in a good agreement with theoretical expectations and show a sensitivity of about −23 kHz/pF at 5.4 MHz and the possibility to operate with interrogation distances up to few centimeters. Full article

(This article belongs to the Proceedings of Proceedings of Eurosensors 2017, Paris, France, 3–6 September 2017)

► Show Figures

Figure 1

5 pages, 699 KiB

Open AccessProceeding Paper

Microstructure for Thermal Impedance Spectroscopy for Biofuel Composition Measurement

by Bo Jiang, Mohammadamir Ghaderi, Andre Bossche, Jaco H. Visser and Reinoud F. Wolffenbuttel

Proceedings 2017, 1(4), 396; https://doi.org/10.3390/proceedings1040396 - 17 Aug 2017

Viewed by 1997

Abstract

Thermal impedance spectroscopy has been investigated as a non-destructive technique to determine the composition of ternary mixtures of biofuels. The principle of the thermal conductivity detector has been extended for measuring both the thermal conductivity and the thermal capacity of biofuel in the [...] Read more.

Thermal impedance spectroscopy has been investigated as a non-destructive technique to determine the composition of ternary mixtures of biofuels. The principle of the thermal conductivity detector has been extended for measuring both the thermal conductivity and the thermal capacity of biofuel in the range between 1 to 100 Hz, using an AC-operated polysilicon heater for injecting a sinusoidal heat flux, and another polysilicon strip at a well-defined spacing or thermopile sensors for measuring the in-phase and quadrature components of the resulting AC temperature difference. Full article

(This article belongs to the Proceedings of Proceedings of Eurosensors 2017, Paris, France, 3–6 September 2017)

► Show Figures

Figure 1

4 pages, 494 KiB

Open AccessProceeding Paper

ZnO Nanostructure Based QCM Sensor to Detect Ethanol at Room Temperature Fabricated by All Wet Process

by Takeshi Ito, Noriyoshi Yamanishi, Tomohiro Shimizu and Shoso Shingubara

Proceedings 2017, 1(4), 397; https://doi.org/10.3390/proceedings1040397 - 8 Aug 2017

Cited by 1 | Viewed by 1971

Abstract

QCM is one of major sensing methods for volatile organic compounds (VOC) at room temperature. Nanostructure is effective to increase the sensitivity because of its large surface area. We introduced ZnO nanostructure to detect ethanol gas. ZnO nanostructure was fabricated by all wet [...] Read more.

QCM is one of major sensing methods for volatile organic compounds (VOC) at room temperature. Nanostructure is effective to increase the sensitivity because of its large surface area. We introduced ZnO nanostructure to detect ethanol gas. ZnO nanostructure was fabricated by all wet process such as electrodeposition and chemical bath deposition (CBD). In this case, seed layer was obtained by electrodeposition, and nanostructure was formed by the CBD. The thickness of seed layer was controllable by charge amount on the electrodeposition, and that of nanostructure was controllable by deposition time on the CBD. As the results, the sensitivity increased with the thickness of the seed layer when the deposition time on CBD was set as 30 min. These results indicate that we can obtain high sensitive VOC sensor by using all wet process which is fit to large scale production with cost-effective. Full article

(This article belongs to the Proceedings of Proceedings of Eurosensors 2017, Paris, France, 3–6 September 2017)

► Show Figures

Figure 1

4 pages, 299 KiB

Open AccessProceeding Paper

Use of Gas Sensors and FOBT for the Early Detection of Colorectal Cancer

by Giulia Zonta, Gabriele Anania, Aldo de Togni, Andrea Gaiardo, Sandro Gherardi, Alessio Giberti, Vincenzo Guidi, Nicolò Landini, Caterina Palmonari, Luciano Ricci and Cesare Malagù

Proceedings 2017, 1(4), 398; https://doi.org/10.3390/proceedings1040398 - 31 Aug 2017

Cited by 5 | Viewed by 2484

Abstract

Among the major challenges of medicine today there are screening and early detection of tumors (since the adenoma stage) in order to prevent their degeneration into malignant cancer and/or metastases. In particular, the colorectal cancer shows a high curability rate, up to 90%, [...] Read more.

Among the major challenges of medicine today there are screening and early detection of tumors (since the adenoma stage) in order to prevent their degeneration into malignant cancer and/or metastases. In particular, the colorectal cancer shows a high curability rate, up to 90%, if identified when in its benign stage. The Protocol discussed here is proposed to implement the clinical validation of a device consisting of an array of chemoresistive gas sensors made of semiconductor materials, able of identifying the difference between fecal exhalation of healthy subjects and of subjects suffering from high-risk colorectal polyps or tumors. The tests are compared to the results of fecal occult blood test and colonoscopy as a gold standard. Full article

(This article belongs to the Proceedings of Proceedings of Eurosensors 2017, Paris, France, 3–6 September 2017)

► Show Figures

Figure 1

4 pages, 552 KiB

Open AccessProceeding Paper

Sensitive and Selective Ammonia Gas Sensor Based on Molecularly Modified SnO₂

by Mohamad Hijazi, Valérie Stambouli, Mathilde Rieu, Guy Tournier, Christophe Pijolat and Jean-Paul Viricelle

Proceedings 2017, 1(4), 399; https://doi.org/10.3390/proceedings1040399 - 25 Aug 2017

Cited by 7 | Viewed by 2752

Abstract

The development of selective and cheap metal oxide gas sensor at ambient temperature is still a challenging idea. In this study, SnO₂ surface functionalization was performed in order to obtain sensitive and selective gas sensor operated at ambient temperature. 3-aminopropyltriethoxysilane (APTES) was [...] Read more.

The development of selective and cheap metal oxide gas sensor at ambient temperature is still a challenging idea. In this study, SnO₂ surface functionalization was performed in order to obtain sensitive and selective gas sensor operated at ambient temperature. 3-aminopropyltriethoxysilane (APTES) was used as an intermediate step, followed by functionalization with molecules having acyl chloride with different end functional groups molecules such as alkyl, acid and ester groups. Acid and ester modified sensors are sensitive to ammonia between 0.2 and 10 ppm at room temperature. However, ester modified SnO₂ is more selective than acid modified sensor regarding ethanol and carbon monoxide gases. Full article

(This article belongs to the Proceedings of Proceedings of Eurosensors 2017, Paris, France, 3–6 September 2017)

► Show Figures

Figure 1

4 pages, 739 KiB

Open AccessProceeding Paper

Reliable Long-Term Data from Low-Cost Gas Sensor Networks in the Environment

by Georgia Miskell, Jennifer Salmond, Stuart Grange, Lena Weissert, Geoff Henshaw and David Williams

Proceedings 2017, 1(4), 400; https://doi.org/10.3390/proceedings1040400 - 25 Aug 2017

Cited by 5 | Viewed by 2119

Abstract

This poster examines long-term performance of low-cost instruments in environmental networks using a semiconducting oxide sensor measuring ground-level ozone (O₃). Sensors were placed outside in networks and automated methodologies based on knowledge of sensor and environment characteristics were successfully applied to [...] Read more.

This poster examines long-term performance of low-cost instruments in environmental networks using a semiconducting oxide sensor measuring ground-level ozone (O₃). Sensors were placed outside in networks and automated methodologies based on knowledge of sensor and environment characteristics were successfully applied to confirm sensor stability. These networks demonstrated how environmental data could be collected and confirmed using networks of low-cost sensors, which supplemented observations from the existing regulatory network. This work is a critical step in the development of networks of low-cost environmental sensors when considering the delivery of reliable data. Full article

(This article belongs to the Proceedings of Proceedings of Eurosensors 2017, Paris, France, 3–6 September 2017)

► Show Figures

Figure 1

5 pages, 1617 KiB

Open AccessProceeding Paper

Oxygen Sensors Based on Screen Printed Platinum and Palladium Doped Indium Oxides

by Wangi Sari, Peter Smith, Simon Leigh and James Covington

Proceedings 2017, 1(4), 401; https://doi.org/10.3390/proceedings1040401 - 11 Aug 2017

Cited by 8 | Viewed by 2622

Abstract

Platinum and palladium doped indium oxide sensors have been successfully fabricated by a screen printing method and tested as oxygen sensors at low temperature (150–400 °C) in a humid environment (~80–85% RH). The sensors, complying with a power law relationship, showed good differentiation [...] Read more.

Platinum and palladium doped indium oxide sensors have been successfully fabricated by a screen printing method and tested as oxygen sensors at low temperature (150–400 °C) in a humid environment (~80–85% RH). The sensors, complying with a power law relationship, showed good differentiation at lower temperatures with highest response observed at 200 °C. Platinum had sensitivity of 2.2% per %O₂ and power law exponent α = 0.72 vs. 0.3% per %O₂ for palladium with power law exponent α = 0.51. Overall, the response of platinum doped indium oxide was higher than the palladium doped version. Full article

(This article belongs to the Proceedings of Proceedings of Eurosensors 2017, Paris, France, 3–6 September 2017)

► Show Figures

Figure 1

3 pages, 334 KiB

Open AccessProceeding Paper

Plasma Oxidized W-WO_x Sensor for Sub-ppm H₂S Detection

by Samatha Benedict and Navakanta Bhat

Proceedings 2017, 1(4), 402; https://doi.org/10.3390/proceedings1040402 - 29 Aug 2017

Cited by 1 | Viewed by 1990

Abstract

In this work we have fabricated W-WO_x core-shell nanowire structure using plasma oxidation, a CMOS compatible process, for sensing H₂S gas. For comparison, the sputtered stack structure of W-WO_x with different thickness ratios of W to WO_x is [...] Read more.

In this work we have fabricated W-WO_x core-shell nanowire structure using plasma oxidation, a CMOS compatible process, for sensing H₂S gas. For comparison, the sputtered stack structure of W-WO_x with different thickness ratios of W to WO_x is fabricated and characterized for H₂S sensing. The sensor fabricated using plasma oxidation process is found to be significantly better in sensing performance compared to the sensing results obtained from sensor fabricated using sputtering. The response of plasma oxidized sensor is 90.4% for 1 ppm H₂S with response and recovery time of 4 s and 46 s respectively. In contrast, the sensor fabricated with sputtered film shows a response of 30.6% at 1 ppm with response and recovery times of 19 s and 84 s respectively. This study clearly indicates that plasma oxidation is an efficient method for development of stable sensors. Full article

(This article belongs to the Proceedings of Proceedings of Eurosensors 2017, Paris, France, 3–6 September 2017)

► Show Figures

Figure 1

4 pages, 559 KiB

Open AccessProceeding Paper

Sensitivity Improvement of Thermoelectric Hydrocarbon Sensors: Combination of Glass-Ceramic Tapes and Alumina Substrates

by Jaroslaw Kita, Gunter Hagen, Christopher Schmitt and Ralf Moos

Proceedings 2017, 1(4), 403; https://doi.org/10.3390/proceedings1040403 - 7 Aug 2017

Cited by 2 | Viewed by 2282

Abstract

This contribution presents the integration of glass-ceramic tapes on alumina substrates to increase the sensitivity of thermoelectric hydrocarbon gas sensors. Both ceramic materials have different thermal conductivity. Their combination into one sensor structure significantly improves the sensitivity by at the same time maintaining [...] Read more.

This contribution presents the integration of glass-ceramic tapes on alumina substrates to increase the sensitivity of thermoelectric hydrocarbon gas sensors. Both ceramic materials have different thermal conductivity. Their combination into one sensor structure significantly improves the sensitivity by at the same time maintaining the excellent mechanical stability at high temperatures. Furthermore, this special technology allows for an easy integration of additional functional elements such as screen-printed thermocouples for temperature control purposes. Full article

(This article belongs to the Proceedings of Proceedings of Eurosensors 2017, Paris, France, 3–6 September 2017)

► Show Figures

Figure 1

4 pages, 1735 KiB

Open AccessProceeding Paper

Modification of SnO₂ Nanowires with TeO₂ Branches and Their Enhanced Gas Sensing

by Myung Sik Choi, Jae Hoon Bang, Ali Mirzaei, Hyoun Woo Kim and Sang Sub Kim

Proceedings 2017, 1(4), 404; https://doi.org/10.3390/proceedings1040404 - 17 Aug 2017

Cited by 3 | Viewed by 2343

Abstract

We prepared a highly sensitive and selective NO₂ sensor, based on the TeO₂ branched SnO₂ nanowires (NWs), in terms of vapor-liquid-solid method, with subsequent growing of branches on the stems of SnO₂ NWs. Fabricated sensors showed a high response [...] Read more.

We prepared a highly sensitive and selective NO₂ sensor, based on the TeO₂ branched SnO₂ nanowires (NWs), in terms of vapor-liquid-solid method, with subsequent growing of branches on the stems of SnO₂ NWs. Fabricated sensors showed a high response higher than 10 to 10 ppm of NO₂ gas at 100 °C. We investigated the associated sensing mechanisms, with respect to the enhancement of sensing behaviors by the addition of TeO₂ branches. Based on the results obtained in this work, we believe that the present sensor with an efficient fabrication technique, and high sensitivity and selectivity can be used for detection of NO₂ gas in real applications. Full article

(This article belongs to the Proceedings of Proceedings of Eurosensors 2017, Paris, France, 3–6 September 2017)

► Show Figures

Figure 1

4 pages, 566 KiB

Open AccessProceeding Paper

Selective Detection of NO₂ with Specific Filters for O₃ Trapping

by Mehdi Othman, Christophe Théron, Marc Bendahan, Charles Rivron, Sandrine Bernardini, Guillaume Le Chevallier, Ludovic Caillat, Khalifa Aguir and Thu-Hoa Tran-Thi

Proceedings 2017, 1(4), 405; https://doi.org/10.3390/proceedings1040405 - 28 Aug 2017

Viewed by 2083

Abstract

The present study evaluates the ozone (O₃) and nitrogen dioxide (NO₂) removal performance of specific filters based on nanoporous materials. These materials, produced via the sol-gel process with functionalized silicon alkoxides as precursors, are tailored for O₃ trapping. [...] Read more.

The present study evaluates the ozone (O₃) and nitrogen dioxide (NO₂) removal performance of specific filters based on nanoporous materials. These materials, produced via the sol-gel process with functionalized silicon alkoxides as precursors, are tailored for O₃ trapping. The gas removal effectiveness of the filters was assessed through measurements of O₃ concentrations in the air upstream and downstream of the filters. Depending on the filter nature, O₃ can be totally trapped while NO₂ can pass over a specific concentration range. Full article

(This article belongs to the Proceedings of Proceedings of Eurosensors 2017, Paris, France, 3–6 September 2017)

► Show Figures

Figure 1

4 pages, 1520 KiB

Open AccessProceeding Paper

Enhance of Sensitivity of Corrole Functionalized Polymeric Microspheres Coated Quartz Microbalances

by Andrea Savoldelli, Gabriele Magna, Sara Nardis, Frank R. Fronczek, Kevin M. Smith, Corrado Di Natale and Roberto Paolesse

Proceedings 2017, 1(4), 406; https://doi.org/10.3390/proceedings1040406 - 17 Aug 2017

Viewed by 2057

Abstract

An innovative and efficient β-functionalization of [5,10,15-tris-(4-methylphenyl)corrolato]Cobalt derivatives introduced an acrolein substituent, which allowed the copolymerization with pure acrolein. The obtained hybrid microparticles have been used as sensing materials of quart microbalance gas sensors. The sensing properties have been tested by exposure to [...] Read more.

An innovative and efficient β-functionalization of [5,10,15-tris-(4-methylphenyl)corrolato]Cobalt derivatives introduced an acrolein substituent, which allowed the copolymerization with pure acrolein. The obtained hybrid microparticles have been used as sensing materials of quart microbalance gas sensors. The sensing properties have been tested by exposure to different volatile organic compounds chosen as model analytes. Results show an improved sensitivity of the hybrid microparticles respect to the individual constituents. Full article

(This article belongs to the Proceedings of Proceedings of Eurosensors 2017, Paris, France, 3–6 September 2017)

► Show Figures

Figure 1

5 pages, 564 KiB

Open AccessProceeding Paper

Hybrid and Bio Nanocomposites for Ultrasensitive Ammonia Sensors

by Jean-luc L. Wojkiewicz, Nathalie Redon, Alexander Pud, Sergei Mikhaylov, Nikolay Ogurtsov, Yuriy Noskov, Camille Collard and Wei Li

Proceedings 2017, 1(4), 407; https://doi.org/10.3390/proceedings1040407 - 11 Aug 2017

Cited by 3 | Viewed by 1872

Abstract

New organic electronic organic ammonia sensors based on hybrid nanocomposites polyaniline-titanium dioxide and on PANI/chitosan with high metrological performances were created. The physical and chemical properties of the nanocomposites were optimized to get a high sensitivity and very low detection threshold (in ppb [...] Read more.

New organic electronic organic ammonia sensors based on hybrid nanocomposites polyaniline-titanium dioxide and on PANI/chitosan with high metrological performances were created. The physical and chemical properties of the nanocomposites were optimized to get a high sensitivity and very low detection threshold (in ppb values). For hybrids, in the core shell form, the performances were analyzed by the synergetic effects of the constituents. For biopolymers it is possible to get high performances ammonia sensors using the way of green chemistry. In both cases the nanocomposites worked at room temperature and showed linear responses with a response time around one minute. Full article

(This article belongs to the Proceedings of Proceedings of Eurosensors 2017, Paris, France, 3–6 September 2017)

► Show Figures

Figure 1

5 pages, 989 KiB

Open AccessProceeding Paper

MgO-Doped (Zr,Sr)TiO₃ Perovskite Humidity Sensors: Microstructural Effects on Water Permeation

by Hamid Farahani, Rahman Wagiran and Gerald Urban

Proceedings 2017, 1(4), 408; https://doi.org/10.3390/proceedings1040408 - 8 Aug 2017

Cited by 6 | Viewed by 2315

Abstract

Porous (Zr_0.5,Sr_0.5)TiO₃ and MgO (1, 3, 5 mol%) doped ZST nanocomposites have been developed and investigated as humidity sensing elements. The surface area analyser and FESEM data have indicated that the MgO doped perovskites are contained of the [...] Read more.

Porous (Zr_0.5,Sr_0.5)TiO₃ and MgO (1, 3, 5 mol%) doped ZST nanocomposites have been developed and investigated as humidity sensing elements. The surface area analyser and FESEM data have indicated that the MgO doped perovskites are contained of the macropores and grain size of about 77 to 87 nm. EFTEM proved the reduction of particle size by addition of MgO dopant concentration. While pure ZST shows BET surface area of about 58 m²/g, MgO doped samples exhibit about 12 m²/g. Sensor contained of ZST doped with 3 mol% MgO shows highest sensitivity with about four orders of magnitude change in impedance within the range of 20% to 95% RH. Full article

(This article belongs to the Proceedings of Proceedings of Eurosensors 2017, Paris, France, 3–6 September 2017)

► Show Figures

Figure 1

4 pages, 620 KiB

Open AccessProceeding Paper

Effects of Infrared Energy on Dual Elliptical NDIR Ethanol Gas Sensors

by Jinho Kim, Sangho Shin and Seunghwan Yi

Proceedings 2017, 1(4), 409; https://doi.org/10.3390/proceedings1040409 - 5 Sep 2017

Cited by 2 | Viewed by 2078

Abstract

This paper presents the effects of infrared energies on dual elliptical nondispersive infrared (NDIR) ethanol gas sensors for preventing drunken drivers and the advantages of using dual ethanol detectors for temperature compensation algorithm. In order to achieve long-term reliability according to the aging [...] Read more.

This paper presents the effects of infrared energies on dual elliptical nondispersive infrared (NDIR) ethanol gas sensors for preventing drunken drivers and the advantages of using dual ethanol detectors for temperature compensation algorithm. In order to achieve long-term reliability according to the aging of infrared source, two ethanol detectors are placed at the two foci of ellipsoids and the averaged voltage ratios of two ethanol detectors are used to establish the compensation methods. Full article

(This article belongs to the Proceedings of Proceedings of Eurosensors 2017, Paris, France, 3–6 September 2017)

► Show Figures

Figure 1

5 pages, 1105 KiB

Open AccessProceeding Paper

Enhanced Characteristics of Nondispersive Infrared CO₂ Gas Sensor by Deposition of Hydrophobic Thin Film

by Jinho Kim, Jayoung Lee, Keunheon Lee and Seunghwan Yi

Proceedings 2017, 1(4), 410; https://doi.org/10.3390/proceedings1040410 - 17 Aug 2017

Cited by 4 | Viewed by 2275

Abstract

This paper presents the NDIR CO₂ gas sensor that has improved the sensitivity and also the accuracy by the deposition of thin hydrophobic film (Parylene-C film with 0.5 micrometer thick) onto the reflector surfaces of White-cell structure. After deposition of hydrophobic thin [...] Read more.

This paper presents the NDIR CO₂ gas sensor that has improved the sensitivity and also the accuracy by the deposition of thin hydrophobic film (Parylene-C film with 0.5 micrometer thick) onto the reflector surfaces of White-cell structure. After deposition of hydrophobic thin film, the sensitivity of sensor has been increased with averaged 10% and the estimated errors were reduced within 13 ppm to 143 ppm from 254 K to 324 K temperature ranges and from 0 ppm to 5000 ppm CO₂ concentrations. Full article

(This article belongs to the Proceedings of Proceedings of Eurosensors 2017, Paris, France, 3–6 September 2017)

► Show Figures

Figure 1

5 pages, 2792 KiB

Open AccessProceeding Paper

Room Temperature NO₂ Responses of Visible-Light Activated Nanosheet rGO@ZnO_1−x Sensors

by Xin Geng, Chao Zhang, Marie-Georges Olivier and Marc Debliquy

Proceedings 2017, 1(4), 411; https://doi.org/10.3390/proceedings1040411 - 23 Aug 2017

Cited by 1 | Viewed by 2030

Abstract

In this study, we use a facile hydrothermal method to synthesize rGO@ZnO_1−x composites. The in-situ synthesized ZnO nanosheets are well attached on the rGO sheets, which prevent the aggregation and restacking of ZnO nanosheets, greatly increasing the specific surface area of the [...] Read more.

In this study, we use a facile hydrothermal method to synthesize rGO@ZnO_1−x composites. The in-situ synthesized ZnO nanosheets are well attached on the rGO sheets, which prevent the aggregation and restacking of ZnO nanosheets, greatly increasing the specific surface area of the synthesized materials. In addition, on account of the reducing synthesis condition, large numbers of oxygen vacancies are implanted into ZnO. With the incorporation of rGO, the visible light absorption range of the composites is greatly enhanced. The synthesized rGO@ZnO_1−x composites exhibit excellent performance to ppb-level NO₂ under white light illumination at room temperature, which effectively overcomes the disadvantages of typical metal oxide gas sensors. Full article

(This article belongs to the Proceedings of Proceedings of Eurosensors 2017, Paris, France, 3–6 September 2017)

► Show Figures

Figure 1

6 pages, 2777 KiB

Open AccessProceeding Paper

Light-Assisted Room-Temperature NO₂ Sensors Based on Black Sheet-Like NiO

by Xin Geng, Driss Lahem, Chao Zhang, Marie-Georges Olivier and Marc Debliquy

Proceedings 2017, 1(4), 412; https://doi.org/10.3390/proceedings1040412 - 22 Aug 2017

Viewed by 1963

Abstract

In this study, we use two-dimensional black flake nickel oxide as the sensitive material which was synthesized by a facile hydrothermal route. The as-synthesized sheet-like NiO possessed a large specific surface area, as verified by BET characterization. The as-prepared NiO nanosheets had strong [...] Read more.

In this study, we use two-dimensional black flake nickel oxide as the sensitive material which was synthesized by a facile hydrothermal route. The as-synthesized sheet-like NiO possessed a large specific surface area, as verified by BET characterization. The as-prepared NiO nanosheets had strong absorption in the range of 250–800 nm including UV and visible light. Upon exposure to ppb-level NO₂, the presented sensors showed significant responses under light illumination at room temperature. In addition, the light wavelength also had a remarkable effect on the sensing performance in terms of sensitivity, response and recovery kinetics. Furthermore, the sensor showed a low humidity dependence. Full article

(This article belongs to the Proceedings of Proceedings of Eurosensors 2017, Paris, France, 3–6 September 2017)

► Show Figures

Figure 1

4 pages, 355 KiB

Open AccessProceeding Paper

Improving the Performance of Electrochemical Sensors by Means of Synergy. Combinations of Gold Nanoparticles and Phthalocyanines

by Maria Luz Rodriguez-Mendez, Ana Isabel Ruiz-Carmuega, Angela Sastre, Javier Ortiz, Celia Garcia-Hernandez and Cristina Garcia-Cabezon

Proceedings 2017, 1(4), 413; https://doi.org/10.3390/proceedings1040413 - 22 Aug 2017

Cited by 1 | Viewed by 1885

Abstract

Voltammetric sensors chemically modified with combinations of two electrocatalytic materials: tetraoctylammonium bromide capped gold nanoparticles (AuNP^NBr) and a sulphur containing zinc phthalocyanine derivative (ZnPc^RS) are reported. The electrocatalytic effects in the detection of catechol have been analyzed in sensors [...] Read more.

Voltammetric sensors chemically modified with combinations of two electrocatalytic materials: tetraoctylammonium bromide capped gold nanoparticles (AuNP^NBr) and a sulphur containing zinc phthalocyanine derivative (ZnPc^RS) are reported. The electrocatalytic effects in the detection of catechol have been analyzed in sensors obtained by direct mixing (AuNP^NBr/ZnPc^RS) and in sensors modified with an adduct where both components are linked covalently (AuNP^NBr-S-ZnPc^R). Results demonstrate that the nature of the interaction between both components modifies the electrocatalytic properties. The AuNP^NBr/ZnPc^RS mixture improves the electron transfer rate of the catechol reduction, with limits of detection of 10⁻⁶ M. The covalent adduct AuNP^NBr-S-ZnPc^R enhances the response rate of the oxidation of the catechol with limits of detection of 10⁻⁷ M. Full article

(This article belongs to the Proceedings of Proceedings of Eurosensors 2017, Paris, France, 3–6 September 2017)

► Show Figures

Figure 1

4 pages, 613 KiB

Open AccessProceeding Paper

Planar Microstrip Ring Resonator Structure for Gas Sensing and Humidity Sensing Purposes

by Andreas Bogner, Carsten Steiner, Stefanie Walter, Jaroslaw Kita, Gunter Hagen and Ralf Moos

Proceedings 2017, 1(4), 414; https://doi.org/10.3390/proceedings1040414 - 21 Aug 2017

Viewed by 2487

Abstract

A planar microstrip ring resonator structure on alumina was developed. It was covered with a zeolite film. The device was successfully operated at around 8.5 GHz at room temperature as a humidity sensor. In the next step, an additional planar heater will be [...] Read more.

A planar microstrip ring resonator structure on alumina was developed. It was covered with a zeolite film. The device was successfully operated at around 8.5 GHz at room temperature as a humidity sensor. In the next step, an additional planar heater will be included on the reverse side of the resonator structure to allow for testing of gas sensitive materials under sensor conditions. Full article

(This article belongs to the Proceedings of Proceedings of Eurosensors 2017, Paris, France, 3–6 September 2017)

► Show Figures

Figure 1

5 pages, 1424 KiB

Open AccessProceeding Paper

Lipophilic Gold Grating for SERS Detection of Biological Objects

by O. Guselnikova, K. Hrobonova, P. Postnikov, O. Lyutakov and V. Svorcik

Proceedings 2017, 1(4), 415; https://doi.org/10.3390/proceedings1040415 - 4 Aug 2017

Cited by 2 | Viewed by 1797

Abstract

We introduce label-free plasmon-active platform based on ordered gold gratings with the covalently modified surface for detection of lipophilic bioobjects. Alkylbenzene groups with different chain length (CH₃-, C4H₉-, C₁₀H₂₁- and C₁₆H₃₃) [...] Read more.

We introduce label-free plasmon-active platform based on ordered gold gratings with the covalently modified surface for detection of lipophilic bioobjects. Alkylbenzene groups with different chain length (CH₃-, C4H₉-, C₁₀H₂₁- and C₁₆H₃₃) were grafted spontaneously and electrochemically for improvement of affinity with lipophilic compounds. Modified grating surfaces were characterized by XPS, CVA, wettability, AFM and Raman spectroscopy techniques. Full article

(This article belongs to the Proceedings of Proceedings of Eurosensors 2017, Paris, France, 3–6 September 2017)

► Show Figures

Figure 1

3 pages, 483 KiB

Open AccessProceeding Paper

NAP-XPS Study of Ethanol Adsorption on TiO₂ Surfaces and Its Impact on Microwave-Based Gas Sensors Response

by Guillaume Bailly, Jerome Rossignol, Didier Stuerga, Pierre Pribetich and Bruno Domenichini

Proceedings 2017, 1(4), 416; https://doi.org/10.3390/proceedings1040416 - 18 Aug 2017

Cited by 3 | Viewed by 2363

Abstract

This work presents new elements of understanding for the microwave-based gas sensors behavior at room temperature. A TiO₂-covered microstrip interdigital capacitor was submitted to various ethanol concentrations and showed a proportional response in the 1–10 GHz microwave range. For each concentration [...] Read more.

This work presents new elements of understanding for the microwave-based gas sensors behavior at room temperature. A TiO₂-covered microstrip interdigital capacitor was submitted to various ethanol concentrations and showed a proportional response in the 1–10 GHz microwave range. For each concentration and right after ethanol injection, the sensor response presented a slight overshoot which is often found in gas sensors studies. Near ambient pressure photoemission experiments (NAP-XPS) were conducted to explore the physicochemical causes of this overshoot, and demonstrated the formation of an ethoxide during ethanol adsorption. Full article

(This article belongs to the Proceedings of Proceedings of Eurosensors 2017, Paris, France, 3–6 September 2017)

► Show Figures

Figure 1

4 pages, 1061 KiB

Open AccessProceeding Paper

Tuning of the Humidity-Interference in Gas Sensitive Columnar ZnO Structures

by Stella Vallejos, Isabel Gràcia, Nadezda Pizúrová, Eduard Figueras, Jaromir Hubálek and Carles Cané

Proceedings 2017, 1(4), 417; https://doi.org/10.3390/proceedings1040417 - 23 Aug 2017

Cited by 3 | Viewed by 2178

Abstract

Gas microsensors based on columnar zinc oxide structures (rods and needles) with different aspect ratios and wetting properties are developed via aerosol-assisted chemical vapor deposition. The correlation between their wetting properties and degree of humidity-interference in gas sensing is presented. Gas sensing tests [...] Read more.

Gas microsensors based on columnar zinc oxide structures (rods and needles) with different aspect ratios and wetting properties are developed via aerosol-assisted chemical vapor deposition. The correlation between their wetting properties and degree of humidity-interference in gas sensing is presented. Gas sensing tests of these systems to hydrogen demonstrate noticeable lower humidity-interference for the columnar zinc oxide structures in the form of needles provided of higher hydrophobicity, as opposed to those in the form of rods, suggesting that a tuning of the wetting properties in metal oxides could allow for the humidity-resilient detection of gaseous analytes. Full article

(This article belongs to the Proceedings of Proceedings of Eurosensors 2017, Paris, France, 3–6 September 2017)

► Show Figures

Figure 1

4 pages, 572 KiB

Open AccessProceeding Paper

ZnO/SnO₂ Heterojunctions Sensors with UV-Enhanced Gas-Sensing Properties at Room Temperature

by Luís F. da Silva, Mattia A. Lucchini, Jean-Claude M’Peko, Sandrine Bernardini, Khalifa Aguir, Caue Ribeiro, Elson Longo and Markus Niederberger

Proceedings 2017, 1(4), 418; https://doi.org/10.3390/proceedings1040418 - 11 Aug 2017

Cited by 3 | Viewed by 2782

Abstract

We report herein the efficiency of microwave-assisted synthesis for obtaining ZnO/SnO₂ heterostructures for room-temperature gas-sensing applications. The sensing performances of the traditional oxide materials have been found for applications above 200 °C. However, these temperatures were here reduced to room temperature by [...] Read more.

We report herein the efficiency of microwave-assisted synthesis for obtaining ZnO/SnO₂ heterostructures for room-temperature gas-sensing applications. The sensing performances of the traditional oxide materials have been found for applications above 200 °C. However, these temperatures were here reduced to room temperature by considering sensing activity photoactivated by UV light, even for ppb ozone (O₃) levels. The heterojunctions exhibited a fast response, total reversibility, and selectivity to oxidizing gases, especially O₃ gas. This investigation provides an efficient way to obtain heterostructures exhibiting remarkable properties for practical applications as O₃ gas sensor devices. Full article

(This article belongs to the Proceedings of Proceedings of Eurosensors 2017, Paris, France, 3–6 September 2017)

► Show Figures

Figure 1

5 pages, 378 KiB

Open AccessProceeding Paper

Development of All-Around SiO₂/Al₂O₃ Gate, Suspended Silicon Nanowire Chemical Field Effect Transistors Si-nw-ChemFET

by Ahmet Lale, Auriane Grappin, Laurent Mazenq, David Bourrier, Aurélie Lecestre, Jérôme Launay and Pierre Temple-Boyer

Proceedings 2017, 1(4), 419; https://doi.org/10.3390/proceedings1040419 - 8 Aug 2017

Viewed by 2017

Abstract

We present a sensor platform associated to silicon-nanowire chemical field effect transistors (Si-nw-ChemFET). Innovations concern the use of networks of suspended silicon N⁺/P/N⁺ nanowires as conducting channel, the realization by thermal oxidation and Atomic-Layer Deposition (ALD) of a SiO₂ [...] Read more.

We present a sensor platform associated to silicon-nanowire chemical field effect transistors (Si-nw-ChemFET). Innovations concern the use of networks of suspended silicon N⁺/P/N⁺ nanowires as conducting channel, the realization by thermal oxidation and Atomic-Layer Deposition (ALD) of a SiO₂/Al₂O₃ gate insulator all-around the silicon nanowires, and their final integration into covered SU8-based microfluidic channels. The Si-nw-MOSFET/ChemFET fabrication process and electrical/electrochemical characterizations are presented. The fabrication process did not need an expensive and time-consuming e-beam lithography, but only fast and “low cost” standard photolithography protocols. Such microdevice will provide new opportunities for bio-chemical analysis at the micro/nanoscale. Full article

(This article belongs to the Proceedings of Proceedings of Eurosensors 2017, Paris, France, 3–6 September 2017)

► Show Figures

Figure 1

4 pages, 573 KiB

Open AccessProceeding Paper

Multimodal Probe Based on ISFET Electrochemical Microsensors for In-Situ Monitoring of Soil Nutrients in Agriculture

by Matthieu Joly, Laurent Mazenq, Maurane Marlet, Pierre Temple-Boyer, Céline Durieu and Jérôme Launay

Proceedings 2017, 1(4), 420; https://doi.org/10.3390/proceedings1040420 - 17 Aug 2017

Cited by 2 | Viewed by 3663

Abstract

We report the design of a silicon chip dedicated to the in-situ monitoring of soil nitrogen cycle in wheat crop. Our study shows that ion-sensitive field effect transistor (ISFET) microsensors are suitable for quick on-site or long-term analysis of nutrients measured directly in [...] Read more.

We report the design of a silicon chip dedicated to the in-situ monitoring of soil nitrogen cycle in wheat crop. Our study shows that ion-sensitive field effect transistor (ISFET) microsensors are suitable for quick on-site or long-term analysis of nutrients measured directly in soil as opposed to soil extracts analysis. Our pH-ISFET recorded soil pH for six months with results in good accordance with standard sampling method and without any loss of sensitivity. The adaptation of pH-ISFET in pNO₃ and pNH₄-ISFET allowed, for the first time, the in-situ measurements of natural variations of soil nitrogen contents caused by microorganisms’ activity Full article

(This article belongs to the Proceedings of Proceedings of Eurosensors 2017, Paris, France, 3–6 September 2017)

► Show Figures

Figure 1

5 pages, 2553 KiB

Open AccessProceeding Paper

High Bandwidth Sensor Module for Mobile Robot Applications-Wind Tunnel Characterization

by Timothy A. Vincent, Yuxin Xing, Marina Cole and Julian W. Gardner

Proceedings 2017, 1(4), 421; https://doi.org/10.3390/proceedings1040421 - 25 Aug 2017

Viewed by 2004

Abstract

We have developed a sensor module containing high-bandwidth VOC and gas sensors (including novel acoustic, custom MOX and low-cost NDIR) to evaluate the concentration of gases in a hazardous environment. We report upon the initial characterization of two MOX gas sensors (1 mm [...] Read more.

We have developed a sensor module containing high-bandwidth VOC and gas sensors (including novel acoustic, custom MOX and low-cost NDIR) to evaluate the concentration of gases in a hazardous environment. We report upon the initial characterization of two MOX gas sensors (1 mm × 1 mm) with coatings of Pd/Pt doped SnO₂ and pure WO₃ inside a wind tunnel to plumes of acetone and ethanol (<10 ppm). The orientation and position of the sensor module in the tunnel was investigated. The unit was tested in a real-world environment with a VOC (propanol); fluctuating sensor responses demonstrated the formation of gas plumes. Full article

(This article belongs to the Proceedings of Proceedings of Eurosensors 2017, Paris, France, 3–6 September 2017)

► Show Figures

Figure 1

4 pages, 441 KiB

Open AccessProceeding Paper

Method for Determining the Concentration of Unknown Combustible Gas

by Alexey Karelin, Evgeny Karpov, Alexander Baranov, Sergey Mironov and Elena Karpova

Proceedings 2017, 1(4), 422; https://doi.org/10.3390/proceedings1040422 - 9 Aug 2017

Viewed by 2042

Abstract

It is known that catalytic sensors have different sensitivities to different combustible gases. Usually gas analyzers are calibrated by methane and not suitable for measuring other flammable gases. Correction is needed to get real concentration of other gases. In this paper it is [...] Read more.

It is known that catalytic sensors have different sensitivities to different combustible gases. Usually gas analyzers are calibrated by methane and not suitable for measuring other flammable gases. Correction is needed to get real concentration of other gases. In this paper it is shown that sensor sensitivity to one particular gas alters with sensor temperature and each gas has its own rate of reducing the sensitivity with a further increase of temperature. It allows us to calculate the concentration of unknown flammable gas. Applying this method decreases measurement error from 30–40% to 5–10% for hydrocarbons. Full article

(This article belongs to the Proceedings of Proceedings of Eurosensors 2017, Paris, France, 3–6 September 2017)

► Show Figures

Figure 1

5 pages, 563 KiB

Open AccessProceeding Paper

Ozone Sensors Working at Room Temperature Using Zinc Oxide Nanocrystals Annealed at Low Temperature

by Sandrine Bernardini, Mohamed Hameda Benchekroun, Tomas Fiorido, Khalifa Aguir, Marc Bendahan, Sadok Ben Dkhil, Meriem Gaceur, Jörg Ackermann, Olivier Margeat and Christine Videlot-Ackermann

Proceedings 2017, 1(4), 423; https://doi.org/10.3390/proceedings1040423 - 11 Aug 2017

Cited by 4 | Viewed by 2287

Abstract

We focus on ozone (O₃) detection at ambient temperature by Zinc Oxide (ZnO) nanoparticles (NPs) deposited on Si/SiO₂ by spin coating from colloidal solutions as sensitive layers for air quality monitoring. We establish that at room temperature using continuous Ultra-Violet [...] Read more.

We focus on ozone (O₃) detection at ambient temperature by Zinc Oxide (ZnO) nanoparticles (NPs) deposited on Si/SiO₂ by spin coating from colloidal solutions as sensitive layers for air quality monitoring. We establish that at room temperature using continuous Ultra-Violet (UV) light irradiation enhances the sensing responses. Three annealing temperatures of ZnO films were performed to compare the sensing properties. These sensors present repeatable responses towards O₃ with fast responses for concentrations as low as 35 ppb with processes compatible with most of flexible substrates. Full article

(This article belongs to the Proceedings of Proceedings of Eurosensors 2017, Paris, France, 3–6 September 2017)

► Show Figures

Figure 1

4 pages, 428 KiB

Open AccessProceeding Paper

Direct Catalyst Conversion Sensor in Form of a Single Self-Heated Mixed-Potential Device

by Thomas Ritter, Gunter Hagen and Ralf Moos

Proceedings 2017, 1(4), 424; https://doi.org/10.3390/proceedings1040424 - 7 Aug 2017

Viewed by 2004

Abstract

Monitoring automotive exhaust gas aftertreatment components is required by law as part of the on-board diagnostics (OBD). For this purpose, a novel sensor device that determines directly the catalyst conversion could be used. It consists of a single, self-heated yttria stabilized ZrO₂ [...] Read more.

Monitoring automotive exhaust gas aftertreatment components is required by law as part of the on-board diagnostics (OBD). For this purpose, a novel sensor device that determines directly the catalyst conversion could be used. It consists of a single, self-heated yttria stabilized ZrO₂-based disc, separating two gas atmospheres. Two identical mixed-potential electrodes yield a voltage signal by comparing a certain trace gas concentration up- and downstream of the catalyst. Measurements in synthetic gas flow verify the theoretical assumption that this voltage signal only depends on the ratio of both concentrations, respectively on the conversion of the catalyst. Full article

(This article belongs to the Proceedings of Proceedings of Eurosensors 2017, Paris, France, 3–6 September 2017)

► Show Figures

Figure 1

4 pages, 422 KiB

Open AccessProceeding Paper

Performance Evaluation of Low-Cost BTEX Sensors and Devices within the EURAMET Key-VOCs Project

by Laurent Spinelle, Michel Gerboles, Gertjan Kok, Stefan Persijn and Tilman Sauerwald

Proceedings 2017, 1(4), 425; https://doi.org/10.3390/proceedings1040425 - 29 Aug 2017

Cited by 9 | Viewed by 2977

Abstract

The KEY-VOCs project is a EURAMET joint research project focused on key Volatile Organic Compounds (VOCs) in air. One of its activities is the evaluation of sensors-based measurement systems. In Europe, the monitoring of benzene in ambient air is mandatory as set by [...] Read more.

The KEY-VOCs project is a EURAMET joint research project focused on key Volatile Organic Compounds (VOCs) in air. One of its activities is the evaluation of sensors-based measurement systems. In Europe, the monitoring of benzene in ambient air is mandatory as set by the European Directive for air quality (AQD) [1]. This Directive states that the reference method of measurement shall consist of active or on-line sampling followed by gas chromatography [2]. These methods are time consuming, expensive to implement and not easily portable prohibiting more local estimation of the population exposure. However, the AQD allows using indicative measurements with higher uncertainty than those of the reference methods. Sensor systems are good candidates for indicative methods with the additional ability of near-to real-time measurements. Full article

(This article belongs to the Proceedings of Proceedings of Eurosensors 2017, Paris, France, 3–6 September 2017)

► Show Figures

Figure 1

3 pages, 500 KiB

Open AccessProceeding Paper

A Non Invasive Sensor System for the Screening of Obstructive Sleep Apnea Syndrome

by Giorgio Pennazza, Marco Santonico, Simone Scarlata, Simona Santangelo, Simone Grasso, Alessandro Zompanti and Raffaele Antonelli Incalzi

Proceedings 2017, 1(4), 426; https://doi.org/10.3390/proceedings1040426 - 7 Aug 2017

Cited by 1 | Viewed by 2117

Abstract

Obstructive Sleep Apnea Syndrome (OSAS) diagnosis can be confirmed only after the polysomnography (PSG), a non-invasive examination requiring one-night hospitalization. Moreover, up to 45% of people undergone PSG actually are free from OSAS. A non invasive sensor system collecting exhaled breath and giving [...] Read more.

Obstructive Sleep Apnea Syndrome (OSAS) diagnosis can be confirmed only after the polysomnography (PSG), a non-invasive examination requiring one-night hospitalization. Moreover, up to 45% of people undergone PSG actually are free from OSAS. A non invasive sensor system collecting exhaled breath and giving a fingerprint of its composition should be a valuable mean for the selection of patients amenable to polysomnography (PSG). Here the BIONOTE (a gas sensor array based on Quartz micro balances functionalized with anthocyanins) together with the Pneumopipe (a patented device for exhaled breath collection) have been used in a study including 136 subjects. BIONOTE was able to correctly discriminate controls with respect to diseased individuals and Chronic Obstructive Pulmonary Diseased (COPD) against OSAS patients. Full article

(This article belongs to the Proceedings of Proceedings of Eurosensors 2017, Paris, France, 3–6 September 2017)

► Show Figures

Figure 1

5 pages, 256 KiB

Open AccessProceeding Paper

Interaction of Colloidal Silver Nanoparticles with Ni²⁺: Sensing Application

by Federico Mochi, Iole Venditti, Ilaria Fratoddi, Chiara Battocchio, Laura Carlini, Giovanna Iucci, Mauro Casalboni, Fabio De Matteis, Stefano Casciardi and Paolo Prosposito

Proceedings 2017, 1(4), 427; https://doi.org/10.3390/proceedings1040427 - 18 Aug 2017

Cited by 3 | Viewed by 2515

Abstract

We report on synthesis of silver nanoparticles (AgNPs) capped with specific thiol suitable to detect heavy metal ions in water. The sensing mechanism is based on a change of an optical properties of the silver colloids, namely the surface plasmon resonance (SPR) when [...] Read more.

We report on synthesis of silver nanoparticles (AgNPs) capped with specific thiol suitable to detect heavy metal ions in water. The sensing mechanism is based on a change of an optical properties of the silver colloids, namely the surface plasmon resonance (SPR) when small amounts of contaminants are present in solution. We detected a specific sensitivity to nickel ions and we investigated the interaction of the AgNPs with Ni²⁺ in the concentration range of 0.5–2.0 ppm. Full article

(This article belongs to the Proceedings of Proceedings of Eurosensors 2017, Paris, France, 3–6 September 2017)

► Show Figures

Figure 1

5 pages, 829 KiB

Open AccessProceeding Paper

WO₃-Doped Indium Oxide Thick Films for Ozone Detection at Low Temperature

by Daniele Ziegler, Andrea Marchisio, Paola Palmero and Jean-Marc Tulliani

Proceedings 2017, 1(4), 428; https://doi.org/10.3390/proceedings1040428 - 18 Aug 2017

Cited by 3 | Viewed by 2030

Abstract

Ozone, a strong oxidizing gas, has dramatically increased its concentration in the troposphere during the last decades. Since high O₃ concentrations are hazardous to human health, the development of effective methods and economic devices to detect this gas is an urgent need. [...] Read more.

Ozone, a strong oxidizing gas, has dramatically increased its concentration in the troposphere during the last decades. Since high O₃ concentrations are hazardous to human health, the development of effective methods and economic devices to detect this gas is an urgent need. In this frame, In₂O₃ is well known as an n-type ozone sensitive and selective material, generally displaying its optimal sensing capability in the temperature range 200–350 °C. To enhance the sensing capability of In₂O₃ and to decrease its operative temperature, in this work, commercial In₂O₃ powders were doped with 2.5 wt. % WO₃. Pure and doped-In₂O₃ materials were used to develop sensing devices by screen-printing technology. Resistance measurements were performed in the temperature range 25 °C–150 °C under 200–500 ppb O₃. Best results were obtained at 75 °C with sensor’s responses as high as 40 under 200 ppb of ozone.
Full article

(This article belongs to the Proceedings of Proceedings of Eurosensors 2017, Paris, France, 3–6 September 2017)

► Show Figures

Figure 1

4 pages, 2154 KiB

Open AccessProceeding Paper

Deposition Rate Influence in O₃ Sensing Response of Sputtered ZnO Thin Films

by Nathaly Colmenares, Wagner Correr and Valmor Roberto Mastelaro

Proceedings 2017, 1(4), 429; https://doi.org/10.3390/proceedings1040429 - 30 Aug 2017

Cited by 2 | Viewed by 2369

Abstract

The study of semiconductor materials applied as chemical gas sensing devices is currently focused on the production of new sensing materials with the best possible properties in terms of detection limits, selectivity, work temperature and response time. Although theoretical models show the great [...] Read more.

The study of semiconductor materials applied as chemical gas sensing devices is currently focused on the production of new sensing materials with the best possible properties in terms of detection limits, selectivity, work temperature and response time. Although theoretical models show the great importance of film morphology on gas detection, a direct relation between structure size/morphology and the gas sensing properties has not been experimentally established. In this work, RF-sputtering deposition technique was used for the synthesis of zinc oxide thin films, and deposition conditions are variated to achieve a remarkable difference in nanostructure size of the material. The electrical resistance variation of the air-exposed films in presence of different ozone concentrations show a strong dependence on the feature size and film morphology, demonstrating the effectiveness of use the parameters of RF sputtering deposition as tunable factors to improve the ZnO sensing properties. Full article

(This article belongs to the Proceedings of Proceedings of Eurosensors 2017, Paris, France, 3–6 September 2017)

► Show Figures

Figure 1

4 pages, 534 KiB

Open AccessProceeding Paper

A Textile Based Polypyrrole Chloride Sensor for Agricultural Use

by Monika Glanc-Gostkiewicz and Nick Harris

Proceedings 2017, 1(4), 430; https://doi.org/10.3390/proceedings1040430 - 9 Aug 2017

Cited by 2 | Viewed by 2034

Abstract

This paper describes the feasibility of developing a novel polypyrrole (PPy) potentiometric sensor. Conductive PPy-based polymers has been grown through a textile scaffold to create a flexible and robust sensing structure that can survive environments such as soil, with the choice of the [...] Read more.

This paper describes the feasibility of developing a novel polypyrrole (PPy) potentiometric sensor. Conductive PPy-based polymers has been grown through a textile scaffold to create a flexible and robust sensing structure that can survive environments such as soil, with the choice of the scaffold materials offering control of the environmental impact. Further work has demonstrated that doped PPy has an electrochemical response that is sensitive to different measurands’ concentration and in this case, we look at chloride response. Various chloride sensors were evaluated in varying concentrations of the potassium chloride test solutions in terms of their chloride ion sensitivity, hydration times and usable lifetime. The best performing sensor has shown a near-Nernstian response between 45–48 mV/decade to chloride ions and at least 2 weeks initial lifetime. Full article

(This article belongs to the Proceedings of Proceedings of Eurosensors 2017, Paris, France, 3–6 September 2017)

► Show Figures

Figure 1

4 pages, 1441 KiB

Open AccessProceeding Paper

Transdermal Alcohol Measurements Using MOX Sensors in Clinical Trials

by Bruno Lawson, Virginie Martini-Laithier, Tomas Fiorido, Fatima Annanouch, Stephane Burtey, Catherine Cassé-Perrot, Christine Audebert, Marc Bendahan, Rachid Bouchakour, Olivier Blin and Khalifa Aguir

Proceedings 2017, 1(4), 431; https://doi.org/10.3390/proceedings1040431 - 11 Aug 2017

Cited by 3 | Viewed by 2591

Abstract

Human metabolism often results in the emission of many VOCs through the skin. Ethanol is one of volatile compounds which are evaporated by perspiration. The aim of our research consists to develop chemical sensors for monitoring ethanol emission after alcohol consumption. The interest [...] Read more.

Human metabolism often results in the emission of many VOCs through the skin. Ethanol is one of volatile compounds which are evaporated by perspiration. The aim of our research consists to develop chemical sensors for monitoring ethanol emission after alcohol consumption. The interest of using chemical sensors is noninvasive measurement and controlling alcohol level in the human body and to make the link between these measurements and that in the blood or in the breath. Recent clinical trials demonstrated the feasibility and relevance of this measurement method. Metal oxide sensors were calibrated in respect of the thermodynamic conditions of the surface of the skin. In this paper we show the first sensor responses by perspiration. Full article

(This article belongs to the Proceedings of Proceedings of Eurosensors 2017, Paris, France, 3–6 September 2017)

► Show Figures

Figure 1

4 pages, 286 KiB

Open AccessProceeding Paper

Operando Investigations of Differently Prepared In₂O₃-Gas Sensors

by Inci Can, Udo Weimar and Nicolae Barsan

Proceedings 2017, 1(4), 432; https://doi.org/10.3390/proceedings1040432 - 29 Aug 2017

Cited by 10 | Viewed by 2467

Abstract

In this study, the electrical characteristics and surface reactions of three different kinds of In₂O₃ based gas sensors were investigated under CO exposure in dry and humid air by using DC electrical resistance measurements and Diffuse reflectance infrared Fourier transform [...] Read more.

In this study, the electrical characteristics and surface reactions of three different kinds of In₂O₃ based gas sensors were investigated under CO exposure in dry and humid air by using DC electrical resistance measurements and Diffuse reflectance infrared Fourier transform spectroscopy (DRIFTS). For the first time one gains insight into the surface reactions during the exposure to CO and humidity. The sensors show different behavior on the baseline in humidity depending on the material which is due to different kinds of OH-groups. The resistance change under CO and humidity exposure are additive and the molecules compete for the same reaction partner confirmed by the spectroscopy results. Through isotopic exchange experiments, different adsorbates could be identified. Full article

(This article belongs to the Proceedings of Proceedings of Eurosensors 2017, Paris, France, 3–6 September 2017)

► Show Figures

Figure 1

4 pages, 513 KiB

Open AccessProceeding Paper

Picomolar Detection of Heavy Ions with Surface Acoustic Wave Sensors Functionalized with New Synthetized Anthracene Derivates

by Ghada Attia, Safa Teka, Saif Rahali, Najla Fourati, Chouki Zerrouki, Mahamadou Seydou, Nourdin Yaakoubi, Selim Chehimi and Rafik Ben Chaabane

Proceedings 2017, 1(4), 433; https://doi.org/10.3390/proceedings1040433 - 7 Aug 2017

Viewed by 1960

Abstract

104 MHz-surface acoustic wave sensors have been functionalized with three new anthracenederivatives for the detection of mercury and copper heavy ions: 2,2-bis(4 anthracenylme,thoxy-1,1′-biphenyl(BP-AN), 9-{[4-({[4-(9anthrylmethoxy)phenyl]sulfanyl}methyl)]methyl] anthracene (TDP-AN) and 4-(9-anthrylmethoxy) benzyl [4-(9-anthrylmethoxy) phenyl] sulfone (BPS-AN). Gravimetric results indicate that, compared to TDP-AN and BPS-AN, BP-AN [...] Read more.

104 MHz-surface acoustic wave sensors have been functionalized with three new anthracenederivatives for the detection of mercury and copper heavy ions: 2,2-bis(4 anthracenylme,thoxy-1,1′-biphenyl(BP-AN), 9-{[4-({[4-(9anthrylmethoxy)phenyl]sulfanyl}methyl)]methyl] anthracene (TDP-AN) and 4-(9-anthrylmethoxy) benzyl [4-(9-anthrylmethoxy) phenyl] sulfone (BPS-AN). Gravimetric results indicate that, compared to TDP-AN and BPS-AN, BP-AN based chemsensor has the highest affinitytowards the two investigated ions.The corresponding sensitivities were of order of 3.67 × 10⁸ °/M and 2.24 × 10⁸ °/M for Hg²⁺ and Cu²⁺ respectively. The limit of detection of the BP-AN-SAW chemsensor, of order of 1 pM, is one of the lowest values ever reported in the literature. Experimental results were supported by quantum chemical calculations, based on the density functional theory. Full article

(This article belongs to the Proceedings of Proceedings of Eurosensors 2017, Paris, France, 3–6 September 2017)

► Show Figures

Figure 1

4 pages, 1062 KiB

Open AccessProceeding Paper

Acetone Detection by Chemical Sensors Based on Tungsten and Titanium Oxide Nanowires

by Angela Bertuna, Elisabetta Comini, Nicola Poli, Dario Zappa and Giorgio Sberveglieri

Proceedings 2017, 1(4), 434; https://doi.org/10.3390/proceedings1040434 - 21 Aug 2017

Cited by 1 | Viewed by 2095

Abstract

Tungsten and titanium oxide (WO₃/Ti) nanowires (NWs) were grown by thermal oxidation of a tungsten and titanium alloy (WTi) metallic layer deposited on 2 × 2 mm²alumina substrates by DC magnetron sputtering. Thermal oxidation was carried out in a [...] Read more.

Tungsten and titanium oxide (WO₃/Ti) nanowires (NWs) were grown by thermal oxidation of a tungsten and titanium alloy (WTi) metallic layer deposited on 2 × 2 mm²alumina substrates by DC magnetron sputtering. Thermal oxidation was carried out in a custom evaporator chamber. Several parameters were controlled to achieve the optimal growth conditions. Morphological and structural analysis were performed on samples by a scanning electron microscope (SEM) and RAMAN spectroscopy, respectively. Nanowires, grown directly on the final transducer, were tested towards different gaseous species in a wide range of working temperatures. In this work, results obtained in presence of acetone are proposed. Full article

(This article belongs to the Proceedings of Proceedings of Eurosensors 2017, Paris, France, 3–6 September 2017)

► Show Figures

Figure 1

4 pages, 2462 KiB

Open AccessProceeding Paper

Impedimetric Biosensor to Enable Fast Evaluation of Gaseous Sterilization Processes

by Jan Oberländer, Julio Arreola, Christina Hansen, Anton Greeff, Marlena Mayer, Michael Keusgen and Michael J. Schöning

Proceedings 2017, 1(4), 435; https://doi.org/10.3390/proceedings1040435 - 8 Aug 2017

Viewed by 2154

Abstract

Sterilization of packages prior to product filling is a key step in aseptic filling machines. Chemical sterilization is one of the main conventional techniques in many packaging industries. To monitor the effect of sterilization on test microorganisms (Bacillus atrophaeus spores), an impedimetric [...] Read more.

Sterilization of packages prior to product filling is a key step in aseptic filling machines. Chemical sterilization is one of the main conventional techniques in many packaging industries. To monitor the effect of sterilization on test microorganisms (Bacillus atrophaeus spores), an impedimetric sensor approach was developed based on a planar interdigitated electrode (IDE) design. In this work, sensor measurements were conducted to prove sensor functionality at different hydrogen peroxide concentrations. Full article

(This article belongs to the Proceedings of Proceedings of Eurosensors 2017, Paris, France, 3–6 September 2017)

► Show Figures

Figure 1

4 pages, 357 KiB

Open AccessProceeding Paper

Investigation of Behavior Stability of Activated Polyaniline Films for Gas Measurements

by Sergey Krutovertsev, Alla Tarasova, Olga Ivanova and Larisa Krutovertseva

Proceedings 2017, 1(4), 436; https://doi.org/10.3390/proceedings1040436 - 8 Aug 2017

Viewed by 1619

Abstract

Synthesis conditions of doped polyaniline films and testing procedure affect markedly the sensor behavior and stability of them. The sensor based on such film consists of a dielectric substrate with system of metallic interdigitated electrodes on its surface. The films were deposited on [...] Read more.

Synthesis conditions of doped polyaniline films and testing procedure affect markedly the sensor behavior and stability of them. The sensor based on such film consists of a dielectric substrate with system of metallic interdigitated electrodes on its surface. The films were deposited on system of metallic interdigitated electrodes by electrochemical synthesis from solutions of aniline with different polyoxometalates and acids. Activating additives into films were tungsten containing polyoxometalates of the eighteen series. Polyoxometalates as multielectron oxidants can alter noticeably the sensor properties of polyaniline if introduced into a conductive polymer film. Morphology of the layers surface and the infrared spectra were explored. Investigations of the behavior of polyoxometalate-polyaniline films at different temperatures, air humidity and testing procedures in clean air and in air containing ammonia were fulfilled. Full article

(This article belongs to the Proceedings of Proceedings of Eurosensors 2017, Paris, France, 3–6 September 2017)

► Show Figures

Figure 1

4 pages, 775 KiB

Open AccessProceeding Paper

Gas Sensing Approaches Based on WO₃ Nanowire-Back Gated Devices

by Tesfalem G. Welearegay, Raul Calavia, Radu Ionescu and Eduard Llobet

Proceedings 2017, 1(4), 437; https://doi.org/10.3390/proceedings1040437 - 9 Aug 2017

Cited by 1 | Viewed by 1982

Abstract

This paper present a new design and configuration of metal oxide gas sensor based on back-gated device that can operate at low temperature. Gold electrodes patterned onto an oxidized, heavily doped, p-type silicon substrate were designed and fabricated at a wafer level. [...] Read more.

This paper present a new design and configuration of metal oxide gas sensor based on back-gated device that can operate at low temperature. Gold electrodes patterned onto an oxidized, heavily doped, p-type silicon substrate were designed and fabricated at a wafer level. The Au—electrodes were used as source—drain metal contacts and a third gate electrode was connected from the backside of the substrate. Tungsten oxide nanowires decorated with Pt-nanoparticles were directly grown employing aerosol assisted-CVD (AA-CVD) on top of the electrode area. Gas sensing properties of the back-gated device in the presence of air and hydrogen gas reveals characteristic response modulated by the applied gate potential at room temperature. It was found that the I_DS-V_GS plot illustrates characteristic field effect transistor with an inherent adsorptive surface electron transfer of the nanowires accompanied with the applied gate potential induced charge transfer. These counter-acting mechanisms might persuade for the application of back-gated device as a promising n-channel metal oxide gas sensor operating at low temperature or even room temperature. Full article

(This article belongs to the Proceedings of Proceedings of Eurosensors 2017, Paris, France, 3–6 September 2017)

► Show Figures

Figure 1

4 pages, 461 KiB

Open AccessProceeding Paper

Cobalt or Silver Doped WO₃ Nanowires Deposited by a Two-Step AACVD for Gas Sensing Applications

by E. Navarrete, E. González, T. Vilic and E. Llobet

Proceedings 2017, 1(4), 438; https://doi.org/10.3390/proceedings1040438 - 18 Aug 2017

Cited by 1 | Viewed by 2063

Abstract

A two-step procedure was implemented to obtain tungsten oxide nanowires (WO₃) doped with cobalt or silver oxide nanoparticles from metal-organic precursors, W(CO)₆, Co(acac)₂ and Ag(acac)₂. In the first step, nanowires were grown at 400 °C using [...] Read more.

A two-step procedure was implemented to obtain tungsten oxide nanowires (WO₃) doped with cobalt or silver oxide nanoparticles from metal-organic precursors, W(CO)₆, Co(acac)₂ and Ag(acac)₂. In the first step, nanowires were grown at 400 °C using an aerosol assisted chemical vapor deposition system (AA-CVD) and subsequently annealed at 500 °C for 2 h. In the second step, metal loading (at different doping levels) of the nanowires using the same system. These hybrid nanomaterials were grown on top of commercial alumina substrates that comprised interdigitated electrodes. The response of these nanomaterials toward H₂S and H₂ is investigated and discussed. Full article

(This article belongs to the Proceedings of Proceedings of Eurosensors 2017, Paris, France, 3–6 September 2017)

► Show Figures

Figure 1

5 pages, 1224 KiB

Open AccessProceeding Paper

Chemical Gas Sensor Based on a Flexible Capacitive Microwave Transducer Associated with a Sensitive Carbon Composite Polymer Film

by Prince Bahoumina, Hamida Hallil, Jean-Luc Lachaud, Aymen Abdelghani, Kamel Frigui, Stephane Bila, Dominique Baillargeat, Qing Zhang, Phillipe Coquet, Carlos Paragua, Emmanuelle Pichonat, Henri Happy, Dominique Rebière and Corinne Dejous

Proceedings 2017, 1(4), 439; https://doi.org/10.3390/proceedings1040439 - 18 Aug 2017

Cited by 3 | Viewed by 2524

Abstract

This communication presents results on the feasibility of an inkjet printed chemical gas sensor suitable for a real time multi-sensing platform. The prototype targets volatile organic compounds (VOCs) such as ethanol vapor to monitor environmental pollution. The designed and ink-jet printed microwave sensor [...] Read more.

This communication presents results on the feasibility of an inkjet printed chemical gas sensor suitable for a real time multi-sensing platform. The prototype targets volatile organic compounds (VOCs) such as ethanol vapor to monitor environmental pollution. The designed and ink-jet printed microwave sensor is presented. Preliminary results have shown the influence of ethanol vapor on the electrical properties of the sensor at microwave frequency range. The sensor’s sensitivity to ethanol vapor has been estimated to −2.48 kHz/ppm. The final aim of this work is to develop a low cost sensor for Internet of Things (IoT) applications. Full article

(This article belongs to the Proceedings of Proceedings of Eurosensors 2017, Paris, France, 3–6 September 2017)

► Show Figures

Figure 1

5 pages, 1597 KiB

Open AccessProceeding Paper

Detection of Mercury Vapor in Air by Differential Heat Dissipation Measurements

by Maria Allers, Tobias Reinecke and Stefan Zimmermann

Proceedings 2017, 1(4), 440; https://doi.org/10.3390/proceedings1040440 - 16 Aug 2017

Cited by 1 | Viewed by 2039

Abstract

In this work, a novel approach for the detection of mercury vapor in air is presented using differential heat dissipation measurements. Therefore, the temperature difference between an amalgamated and a non-exposed gold film is recorded, while heating both films with identical electrical power. [...] Read more.

In this work, a novel approach for the detection of mercury vapor in air is presented using differential heat dissipation measurements. Therefore, the temperature difference between an amalgamated and a non-exposed gold film is recorded, while heating both films with identical electrical power. As the amalgam layer lowers the heat dissipation, the amalgamated gold film reaches higher temperatures compared to the non-exposed gold film. Preliminary experiments show a clear dependence of the measured temperature difference on the mercury vapor concentration and the exposition time. Thus, a detection of mercury vapor is generally possible using differential heat dissipation measurements. Full article

(This article belongs to the Proceedings of Proceedings of Eurosensors 2017, Paris, France, 3–6 September 2017)

► Show Figures

Figure 1

5 pages, 663 KiB

Open AccessProceeding Paper

Submersible Dielectric Probe for In Situ Monitoring of Suspensions and Its Application to Activated Sludge in Waste Water Treatment Plant

by Michel Perdicakis, Jacques Bessière and Jérôme Cortot

Proceedings 2017, 1(4), 441; https://doi.org/10.3390/proceedings1040441 - 8 Aug 2017

Viewed by 1847

Abstract

We have developed a useful dielectric probe that allows real-time and in situ characterization of suspensions in the 0.4 to 10 MHz frequency range. It has been successfully tested throughout several weeks to monitor activated sludge of a waste water treatment plant. In [...] Read more.

We have developed a useful dielectric probe that allows real-time and in situ characterization of suspensions in the 0.4 to 10 MHz frequency range. It has been successfully tested throughout several weeks to monitor activated sludge of a waste water treatment plant. In this paper the results are compared with those obtained in parallel using both static or flow classic dielectric cells. Full article

(This article belongs to the Proceedings of Proceedings of Eurosensors 2017, Paris, France, 3–6 September 2017)

► Show Figures

Figure 1

4 pages, 972 KiB

Open AccessProceeding Paper

Tin Dioxide-Graphene Based Chemi-Device for NO₂ Detection in the Sub ppm Range

by José Pedro Santos, Tiziana Polichetti, Manuel Aleixandre, Esther Hontañón, Isabel Sayago, Brigida Alfano, Maria Lucia Miglietta and Girolamo Di Francia

Proceedings 2017, 1(4), 442; https://doi.org/10.3390/proceedings1040442 - 8 Aug 2017

Cited by 5 | Viewed by 2072

Abstract

Chemical nanodevices based on tin dioxide, graphene and a mixture of both materials were developed and characterized for NO₂ detection at low concentrations. The chemiresistors were prepared by both electrospinning and drop casting. The films morphologies were investigated by scanning electron microscopy [...] Read more.

Chemical nanodevices based on tin dioxide, graphene and a mixture of both materials were developed and characterized for NO₂ detection at low concentrations. The chemiresistors were prepared by both electrospinning and drop casting. The films morphologies were investigated by scanning electron microscopy (SEM). The devices response to sub-ppm NO₂ concentrations was measured from room temperature up to 300 °C. An improvement in the performance in terms of sensitivity and response time, as well as higher responses at room temperature, was obtained when a mixture of these materials is used. Full article

(This article belongs to the Proceedings of Proceedings of Eurosensors 2017, Paris, France, 3–6 September 2017)

► Show Figures

Figure 1

4 pages, 882 KiB

Open AccessProceeding Paper

Electron Capture Detector with Non-Radioactive Electron Source

by Erik Bunert, Ansgar T. Kirk, Jens Oermann and Stefan Zimmermann

Proceedings 2017, 1(4), 443; https://doi.org/10.3390/proceedings1040443 - 16 Aug 2017

Cited by 3 | Viewed by 3970

Abstract

Gas chromatographs equipped with electron capture detectors (ECD) are widely used for the analysis of electron affine substances. Achieving limits of detection in the low ppt_v-range, electron capture detectors are the most sensitive detectors available for such compounds. Based on their [...] Read more.

Gas chromatographs equipped with electron capture detectors (ECD) are widely used for the analysis of electron affine substances. Achieving limits of detection in the low ppt_v-range, electron capture detectors are the most sensitive detectors available for such compounds. Based on their operating principle, they require free electrons at atmospheric pressure, which are usually generated by using a β^--decay. However, the use of radioactive materials leads to regulatory restrictions regarding purchase, operation and disposal. Here, we present a new electron capture detector using a non-radioactive electron source, which is not subject to these limitations and offers further advantages such as adjustable and higher electron densities and energies. Full article

(This article belongs to the Proceedings of Proceedings of Eurosensors 2017, Paris, France, 3–6 September 2017)

► Show Figures

Figure 1

4 pages, 592 KiB

Open AccessProceeding Paper

Surface Acoustic Wave Sensors for the Detection of Hazardous Compounds in Indoor Air

by Meddy Vanotti, Christophe Theron, Sacha Poisson, Valentin Quesneau, Mario Naitana, Valérie Soumann, Stéphane Brandès, Nicolas Desbois, Claude Gros, Thu-Hoa Tran-Thi and Virginie Blondeau-Patissier

Proceedings 2017, 1(4), 444; https://doi.org/10.3390/proceedings1040444 - 24 Aug 2017

Cited by 5 | Viewed by 2612

Abstract

In this work, the authors show the capabilities of Surface Acoustic Wave (SAW) devices coupled with various absorbents to probe the properties of gas sensitive materials for the manufacturing of hazardous gas sensors. The great capabilities of cobalt corroles for the trapping of [...] Read more.

In this work, the authors show the capabilities of Surface Acoustic Wave (SAW) devices coupled with various absorbents to probe the properties of gas sensitive materials for the manufacturing of hazardous gas sensors. The great capabilities of cobalt corroles for the trapping of carbon monoxide (CO) were exploited to produce selective sensors. These corroles were deposited on SAW delay lines surfaces and then exposed to carbon monoxide (CO) in standard conditions. Concentrations of a few hundreds of ppb were measured emphasizing the interest of such sensors for the detection of CO. Another type of sensitive layers exhibiting specific porosity adapted to the trapping of formaldehyde (CH₂O) were deposited on similar delay lines. A detection threshold of 140 ppb was shown. These encouraging results pave the way for the development of a functionalized SAW sensors network for multi-gas detection in indoor air. Full article

(This article belongs to the Proceedings of Proceedings of Eurosensors 2017, Paris, France, 3–6 September 2017)

► Show Figures

Figure 1

4 pages, 456 KiB

Open AccessProceeding Paper

Low Temperature CVD Grown Graphene for Highly Selective Gas Sensors Working under Ambient Conditions

by Filiberto Ricciardella, Sten Vollebregt, Tiziana Polichetti, Brigida Alfano, Ettore Massera and Pasqualina M. Sarro

Proceedings 2017, 1(4), 445; https://doi.org/10.3390/proceedings1040445 - 16 Aug 2017

Cited by 5 | Viewed by 2718

Abstract

In this paper we report on gas sensors based on graphene grown by Chemical Vapor Deposition at 850 °C. Mo was used as catalyst for graphene nucleation. Resistors were directly designed on pre-patterned Mo using the transfer-free process we recently developed, thus avoiding [...] Read more.

In this paper we report on gas sensors based on graphene grown by Chemical Vapor Deposition at 850 °C. Mo was used as catalyst for graphene nucleation. Resistors were directly designed on pre-patterned Mo using the transfer-free process we recently developed, thus avoiding films damage during the transfer to the target substrate. Devices operating at room temperature and relative humidity set at 50% were tested towards NO₂. The sensors resulted to be highly specific towards NO₂ and showed current variation up to 6%. The performances were compared with those of gas sensors based on graphene grown at 980 °C, which represents the usual growth temperature for such material. The findings show that by lowering the graphene growth temperature and consequently the energy consumptions the sensing benefits of these devices are still preserved. Full article

(This article belongs to the Proceedings of Proceedings of Eurosensors 2017, Paris, France, 3–6 September 2017)

► Show Figures

Figure 1

5 pages, 628 KiB

Open AccessProceeding Paper

Influence of Electrical Modes on Radiation Sensitivity of Hydrogen Sensors Based on Pd-Ta₂O₅-SiO₂-Si Structures

by Boris Podlepetsky, Andrew Kovalenko and Marina Nikiforova

Proceedings 2017, 1(4), 446; https://doi.org/10.3390/proceedings1040446 - 25 Aug 2017

Viewed by 1566

Abstract

The influence of the circuit’s electric modes on the radiation sensitivity of hydrogen sensors based on the metal-insulator-semiconductor field-effect transistor with structure Pd-Ta₂O₅-SiO₂-Si (MISFET) was investigated. There were measured the hydrogen responses of output voltages V of [...] Read more.

The influence of the circuit’s electric modes on the radiation sensitivity of hydrogen sensors based on the metal-insulator-semiconductor field-effect transistor with structure Pd-Ta₂O₅-SiO₂-Si (MISFET) was investigated. There were measured the hydrogen responses of output voltages V of the MISFET-based circuits at different gate voltages before and after the electron irradiations. The voltages V as functions of hydrogen concentration C were determined for different ionizing doses D. Models of influence of the electric modes on the radiation sensitivity of sensors were based on experimental dependencies of V(C, D). The recommendations for the optimal choice of MISFET-based circuit’s electric modes were formulated. Full article

(This article belongs to the Proceedings of Proceedings of Eurosensors 2017, Paris, France, 3–6 September 2017)

► Show Figures

Figure 1

3 pages, 427 KiB

Open AccessProceeding Paper

A Gas Sensor Device for Oxygen and Carbon Dioxide Detection

by Marco Santonico, Giorgio Pennazza, Francesca Romana Parente, Simone Grasso, Alessandro Zompanti, Vincenzo Stornelli, Giuseppe Ferri, Mariano Bizzarri and Arnaldo D’Amico

Proceedings 2017, 1(4), 447; https://doi.org/10.3390/proceedings1040447 - 11 Aug 2017

Cited by 4 | Viewed by 2832

Abstract

Sensors for monitoring oxygen and carbon dioxide are crucial as investigational devices in many different research fields, including environmental, biomedical and industrial. They must be easily configurable, fast responding, and with good reproducibility and sensitivity. The state of art reports different sensing and [...] Read more.

Sensors for monitoring oxygen and carbon dioxide are crucial as investigational devices in many different research fields, including environmental, biomedical and industrial. They must be easily configurable, fast responding, and with good reproducibility and sensitivity. The state of art reports different sensing and transducing strategies: electrochemical, optical, conductometric etc., based on specific chemically interactive materials. In this work, a multisensor system based on electrochemical sensors acting via a liquid medium and controlled by a dedicated low-noise electronic interface is equipped with an elaboration unit able in extracting/storing a committed model for oxygen and carbon dioxide detection. Full article

(This article belongs to the Proceedings of Proceedings of Eurosensors 2017, Paris, France, 3–6 September 2017)

► Show Figures

Figure 1

4 pages, 833 KiB

Open AccessProceeding Paper

Study of Poly(3-hexyltiophene) Polymer Sensing Properties in Nerve Agent Simulant (DMMP) Detection

by Paulina Powroźnik, Agnieszka Stolarczyk, Jarosław Wrotniak and Wiesław Jakubik

Proceedings 2017, 1(4), 448; https://doi.org/10.3390/proceedings1040448 - 11 Aug 2017

Cited by 4 | Viewed by 1947

Abstract

In the present work we report the use of regioregular poly(3-hexyltiophene) polymer (RR-P3HT) as a resistive sensor for the detection of chemical nerve agent simulant, dimethyl methylphosphonate (DMMP). The electrical response to DMMP vapour of RR-P3HT film deposited on ceramic (Al₂O [...] Read more.

In the present work we report the use of regioregular poly(3-hexyltiophene) polymer (RR-P3HT) as a resistive sensor for the detection of chemical nerve agent simulant, dimethyl methylphosphonate (DMMP). The electrical response to DMMP vapour of RR-P3HT film deposited on ceramic (Al₂O₃) substrate in the room temperature was investigated. Results show that studied material is sensitive to DMMP trace amounts and selective against acetone and methanol. It also exhibits fast response and recovery times, repeatability and short-term stability. Full article

(This article belongs to the Proceedings of Proceedings of Eurosensors 2017, Paris, France, 3–6 September 2017)

► Show Figures

Figure 1

4 pages, 2220 KiB

Open AccessProceeding Paper

Gas Sensing Properties of MoO₃

by Hashitha M. M. Munasinghe Arachchige, Elisabetta Comini, Dario Zappa and Girorgio Sberveglieri

Proceedings 2017, 1(4), 449; https://doi.org/10.3390/proceedings1040449 - 16 Aug 2017

Cited by 5 | Viewed by 2501

Abstract

In the present work, we studied the controlled growth of MoO₃ nanostructures and their gas sensing performance. MoO₃ NS were synthesized using thermal evaporation method. FE-SEM (LEO 1525) and XRD were used to characterize the morphology and crystallinity of MoO₃ [...] Read more.

In the present work, we studied the controlled growth of MoO₃ nanostructures and their gas sensing performance. MoO₃ NS were synthesized using thermal evaporation method. FE-SEM (LEO 1525) and XRD were used to characterize the morphology and crystallinity of MoO₃ NS. Sensing devices were mounted on TO packages using electro-soldered gold wires, and they were tested toward some chemical compounds. These NS give reversible response to Acetone, Ethanol and H₂ in a temperature range of 300–550 °C. MoO₃ sensors exhibit a high response ∆G/G = 45 towards 50 ppm of Ethanol at 450 °C. Full article

(This article belongs to the Proceedings of Proceedings of Eurosensors 2017, Paris, France, 3–6 September 2017)

► Show Figures

Figure 1

4 pages, 797 KiB

Open AccessProceeding Paper

Quantitative Analysis of Wine Mixtures Using an Electronic Olfactory System

by Manuel Aleixandre, Enrique Montero, Teresa Arroyo, Juan Mariano Cabellos and María Carmen Horrillo

Proceedings 2017, 1(4), 450; https://doi.org/10.3390/proceedings1040450 - 8 Aug 2017

Cited by 2 | Viewed by 2164

Abstract

An electronic nose has been used for the quantification of wines formed by binary mixtures of two white wine varieties and of two red wine varieties. The wines were elaborated at the Instituto Madrileño de Investigación y Desarrollo Rural (IMIDRA) by the traditional [...] Read more.

An electronic nose has been used for the quantification of wines formed by binary mixtures of two white wine varieties and of two red wine varieties. The wines were elaborated at the Instituto Madrileño de Investigación y Desarrollo Rural (IMIDRA) by the traditional method using commercial and autochthonous Saccharomyces cerevisiae yeasts. It is important to note that this technology is faster, simpler and objective than the sensing analysis (human panel). In addition the measurements can be realized in situ and on line. The measurements of the wine mixtures have been analyzed by Partial Least Squares and Artificial Neuronal Networks. Full article

(This article belongs to the Proceedings of Proceedings of Eurosensors 2017, Paris, France, 3–6 September 2017)

► Show Figures

Figure 1

4 pages, 1104 KiB

Open AccessProceeding Paper

Enhancement of the Sensitivity of a Volatile Organic Compounds MOF-Sensor by Means of Its Structure

by Diego Lopez-Torres, Aitor Lopez-Aldaba, Cesar Elosua, Jean L. Auguste, Rapahel Jamier, Philippe Roy, Manuel Lopez-Amo and Francisco J. Arregui

Proceedings 2017, 1(4), 451; https://doi.org/10.3390/proceedings1040451 - 16 Aug 2017

Cited by 2 | Viewed by 2075

Abstract

In this paper, we experimentally compare several core structures of Microstructured Optical Fibers (MOFs) for low-finesse Fabry-Pérot (FP) sensors. These sensors are designed for Volatile Organic Compounds (VOCs) measurements. We deposit Indium Tin Oxide (ITO) thin films by sputtering on the MOFs and [...] Read more.

In this paper, we experimentally compare several core structures of Microstructured Optical Fibers (MOFs) for low-finesse Fabry-Pérot (FP) sensors. These sensors are designed for Volatile Organic Compounds (VOCs) measurements. We deposit Indium Tin Oxide (ITO) thin films by sputtering on the MOFs and different optical phase responses of the FP were measured for saturated atmospheres of ethanol. The sensitivity of the developed sensors is demonstrated to depend on the geometry and the dimensions of the MOF-cores. The sensors show recovery times under 100 s and the baselines are fully recovered after exposure to VOC. Full article

(This article belongs to the Proceedings of Proceedings of Eurosensors 2017, Paris, France, 3–6 September 2017)

► Show Figures

Figure 1

4 pages, 587 KiB

Open AccessProceeding Paper

Detection of Nitrate/Nitrite Using BDD Electrodes Coated with Metal Nano-Catalysts

by B. Zribi and E. Scorsone

Proceedings 2017, 1(4), 452; https://doi.org/10.3390/proceedings1040452 - 11 Aug 2017

Viewed by 2155

Abstract

The aim of this work is to investigate the mechanisms of nitrate and nitrite ions electro-reduction in neutral solution at boron doped diamond (BDD) electrodes modified with metal catalyst nanoparticles. The electrode preparation consists in sputtering a thin metal layer onto polycrystalline BDD [...] Read more.

The aim of this work is to investigate the mechanisms of nitrate and nitrite ions electro-reduction in neutral solution at boron doped diamond (BDD) electrodes modified with metal catalyst nanoparticles. The electrode preparation consists in sputtering a thin metal layer onto polycrystalline BDD by a physical vapor deposition method, followed by a dewetting heat treatment at 700 °C under oxygen-free atmosphere. Such a process leads to a stable population of nanosized metal particles as characterized by scanning electron microscopy (SEM) and cyclic voltammetry. Electro-reduction of NO₂⁻ and NO₃⁻ was characterized both on a bare BDD electrode and on BDD electrodes decorated with platinum-gold, ruthenium-gold and ruthenium nanoparticles in the range 4 to 25 mM. The amperometric response was enhanced by the presence of the nanoparticles, the most sensitive electrode being Pt-Au/BDD and Ru-Au/BDD for nitrite and nitrate ions, respectively. Full article

(This article belongs to the Proceedings of Proceedings of Eurosensors 2017, Paris, France, 3–6 September 2017)

► Show Figures

Figure 1

4 pages, 487 KiB

Open AccessProceeding Paper

Improving Calibration of Chemical Gas Sensors for Fire Detection Using Small Scale Setups

by Ana Solórzano, Jordi Fonollosa and Santiago Marco

Proceedings 2017, 1(4), 453; https://doi.org/10.3390/proceedings1040453 - 9 Aug 2017

Cited by 3 | Viewed by 2394

Abstract

Chemical sensing may be better suited than conventional smoke-based detectors for the detection of certain type of fires, in particular in fires where smoke appears after gas emissions. However, chemical-based systems also respond to non-fire scenarios that also release volatiles. For this reason, [...] Read more.

Chemical sensing may be better suited than conventional smoke-based detectors for the detection of certain type of fires, in particular in fires where smoke appears after gas emissions. However, chemical-based systems also respond to non-fire scenarios that also release volatiles. For this reason, discrimination models need to be trained under different fire and non-fire scenarios. This is usually performed in standard fire rooms, the access to which is very costly. In this work, we present a calibration model combining experiments from standard fire room and small-scale setup. Results show that the use of small-scale setup experiments improve the performance of the system. Full article

(This article belongs to the Proceedings of Proceedings of Eurosensors 2017, Paris, France, 3–6 September 2017)

► Show Figures

Figure 1

5 pages, 562 KiB

Open AccessProceeding Paper

Investigation of Gasochromic Rhodium Complexes Regarding Their Reactivity towards CO

by Karina Tarantik, Katrin Schmitt, Carolin Pannek, Lutz Miensopust and Jürgen Wöllenstein

Proceedings 2017, 1(4), 454; https://doi.org/10.3390/proceedings1040454 - 17 Aug 2017

Cited by 3 | Viewed by 2110

Abstract

The detection of the toxic gas carbon monoxide (CO) in the low ppm range is required in different applications. We present a study of the reactivity of different gasochromic rhodium complexes towards the toxic gas carbon monoxide (CO). Therefore, the binuclear rhodium complexes [...] Read more.

The detection of the toxic gas carbon monoxide (CO) in the low ppm range is required in different applications. We present a study of the reactivity of different gasochromic rhodium complexes towards the toxic gas carbon monoxide (CO). Therefore, the binuclear rhodium complexes with different ligands were prepared and their influence regarding reaction velocity and sensitivity towards CO was investigated. The most promising rhodium complex was embedded into a polymer with which glass substrates were coated. The reactivity towards CO of these layers was also investigated. Full article

(This article belongs to the Proceedings of Proceedings of Eurosensors 2017, Paris, France, 3–6 September 2017)

► Show Figures

Figure 1

4 pages, 438 KiB

Open AccessProceeding Paper

2D SnS₂—A Material for Impedance-Based Low Temperature NO_xSensing?

by Daniela Schönauer-Kamin, Yongxiang Li, Wojtek Wlodarski, Samuel Ippolito and Ralf Moos

Proceedings 2017, 1(4), 455; https://doi.org/10.3390/proceedings1040455 - 9 Aug 2017

Viewed by 2525

Abstract

The sensor signal of tin disulfide (SnS₂), a two-dimensional (2D) group-IV dichalcogenide, deposited as a film on a conductometric transducer is investigated at 130 °C. The focus is on the detection of the total NO_x concentration. Therefore, the sensor response [...] Read more.

The sensor signal of tin disulfide (SnS₂), a two-dimensional (2D) group-IV dichalcogenide, deposited as a film on a conductometric transducer is investigated at 130 °C. The focus is on the detection of the total NO_x concentration. Therefore, the sensor response to NO and NO₂ at ppm- and sub-ppm level at low operating temperature is determined. The results show that the sensing device provides a high sensor signal to NO and NO₂ even at concentrations of only 390 ppb NO_x. Both nitrous components, NO and NO₂, yield the same signal, which offers the opportunity to sense the total concentration of NO_x. Full article

(This article belongs to the Proceedings of Proceedings of Eurosensors 2017, Paris, France, 3–6 September 2017)

► Show Figures

Figure 1

4 pages, 640 KiB

Open AccessProceeding Paper

Study of YSZ Electrolyte Inks for Preparation of Screen-Printed Mixed-Potential Sensors for Selective Detection of NO_x and NH₃

by Gita Nematbakhsh Abkenar, Mathilde Rieu, Philippe Breuil and Jean-paul Viricelle

Proceedings 2017, 1(4), 456; https://doi.org/10.3390/proceedings1040456 - 16 Aug 2017

Cited by 1 | Viewed by 1946

Abstract

Among all NO_x reduction approaches, selective catalyst reduction (SCR) system is one the most reliable ways to control NO_x emissions from diesel engine vehicles and trucks. In order to optimize the conversion rates of NO_x and to prevent inducing excessive [...] Read more.

Among all NO_x reduction approaches, selective catalyst reduction (SCR) system is one the most reliable ways to control NO_x emissions from diesel engine vehicles and trucks. In order to optimize the conversion rates of NO_x and to prevent inducing excessive NH₃ to the air, an NH₃ and NO_x sensor is required. In this study, three different types of YSZ ink have been examined to identify the most effective electrolyte for NO_x and NH₃ sensing. The results have shown that a home-made ink with YSZ powder shows the best sensitivity towards ammonia without polarization and the highest NO₂/NO signal ratio with polarization current of 25 nA. Full article

(This article belongs to the Proceedings of Proceedings of Eurosensors 2017, Paris, France, 3–6 September 2017)

► Show Figures

Figure 1

3 pages, 572 KiB

Open AccessProceeding Paper

Exhaust Gas Analysis of Firewood Combustion Processes: Application of a Robust Thermoelectric Gas Sensor

by Binayak Ojha, Gunter Hagen, Heinz Kohler and Ralf Moos

Proceedings 2017, 1(4), 457; https://doi.org/10.3390/proceedings1040457 - 8 Aug 2017

Cited by 1 | Viewed by 2793

Abstract

The quality of firewood combustion processes can be considerably improved by automated control of the combustion air streams. For this purpose, continuous flue gas analysis using in-situ sensors is essential. In order to monitor the unburned exhaust gas components like carbon monoxide (CO) [...] Read more.

The quality of firewood combustion processes can be considerably improved by automated control of the combustion air streams. For this purpose, continuous flue gas analysis using in-situ sensors is essential. In order to monitor the unburned exhaust gas components like carbon monoxide (CO) and hydrocarbons (C_xH_y), for the first time a novel thermoelectric gas sensor was applied directly in the exhaust gas. The sensor is made of high temperature stable materials and promises the needed robustness. Here, the sensor signal is compared to flue gas analysis data from FTIR measurements during a wood-log batch firing experiment. An impressive correlation between both data was found. Full article

(This article belongs to the Proceedings of Proceedings of Eurosensors 2017, Paris, France, 3–6 September 2017)

► Show Figures

Figure 1

4 pages, 976 KiB

Open AccessProceeding Paper

Gas Sensing Characterization of Single-Nanowire Sensor Array Systems Based on Non-Functionalized and Pt-Functionalized Tungsten Oxide

by Ondřej Chmela, Jakub Sadílek, Jakub Somer, Jordi Samà, Guillem Domènech-Gil, Albert Romano-Rodriguez, Jaromír Hubálek and Stella Vallejos

Proceedings 2017, 1(4), 458; https://doi.org/10.3390/proceedings1040458 - 9 Aug 2017

Cited by 1 | Viewed by 2105

Abstract

Here we present the gas sensing characterization of single-nanowire sensor array systems based on either non-functionalized or Pt-functionalized single tungsten oxide nanowires towards various concentrations of nitrogen dioxide and ethanol. The sensor systems demonstrate stable and reproducible responses to the tested analytes, showing [...] Read more.

Here we present the gas sensing characterization of single-nanowire sensor array systems based on either non-functionalized or Pt-functionalized single tungsten oxide nanowires towards various concentrations of nitrogen dioxide and ethanol. The sensor systems demonstrate stable and reproducible responses to the tested analytes, showing consistency with previous systems based on multiple-nanowire based films and validating the fabrication process of these devices. Full article

(This article belongs to the Proceedings of Proceedings of Eurosensors 2017, Paris, France, 3–6 September 2017)

► Show Figures

Figure 1

4 pages, 383 KiB

Open AccessProceeding Paper

Evaluation of MOX Sensor Characteristics in Ultra-Low Power Operation Modes: Application to a Semi-Passive RFID Tag for Food Logistics

by Francisco Palacio, José María Gómez, Javier Burgués, Raquel Pruna, Manel López, Andrea Scorzoni, Stefano Zampolli and Santiago Marco

Proceedings 2017, 1(4), 459; https://doi.org/10.3390/proceedings1040459 - 8 Aug 2017

Viewed by 2027

Abstract

Most of the battery powered systems with integrated sensors need low power consumption modes to enlarge the operation time. In the case of the fruit logistic chain, the fruit quality may be controlled by the detection of some gases as ethylene, acetaldehyde and [...] Read more.

Most of the battery powered systems with integrated sensors need low power consumption modes to enlarge the operation time. In the case of the fruit logistic chain, the fruit quality may be controlled by the detection of some gases as ethylene, acetaldehyde and ammonia, that are related to maturation, oxygen stress and refrigeration leakage. We report the integration of an ultra-low power (ULP) metal oxide (MOX) sensor array inside a Radio Frequency IDentification (RFID) 13.56 MHz ISO/IEC 15693 compliant tag with temperature, humidity and light sensors and data logging capabilities. Pulsed Temperature Operation (PTO), which consists in switching on and off the sensor heater, was used to reduce power consumption more than three orders of magnitude, from 14 mW down to 7 μW. The sensor behavior was characterized in terms sensitivity for ammonia. Full article

(This article belongs to the Proceedings of Proceedings of Eurosensors 2017, Paris, France, 3–6 September 2017)

► Show Figures

Figure 1

4 pages, 1058 KiB

Open AccessProceeding Paper

Influence of Metal Catalyst on SnO₂ Nanowires Growth and Gas Sensing Performance

by Dario Zappa, Rebecca Melloni, Valentin-Adrian Maraloiu, Nicola Poli, Marco Rizzoni, Veronica Sberveglieri, Orhan Sisman, Matteo Soprani and Elisabetta Comini

Proceedings 2017, 1(4), 460; https://doi.org/10.3390/proceedings1040460 - 11 Aug 2017

Cited by 4 | Viewed by 2197

Abstract

In the present work SnO₂ nanowires were synthetized by using vapour-liquid-solid technique (VLS) on alumina substrates, using different metal nanoparticles as catalyst for the growth. In particular, the effect of Au, Sn and Pd nanoparticles was exploited. The growth was performed simultaneously [...] Read more.

In the present work SnO₂ nanowires were synthetized by using vapour-liquid-solid technique (VLS) on alumina substrates, using different metal nanoparticles as catalyst for the growth. In particular, the effect of Au, Sn and Pd nanoparticles was exploited. The growth was performed simultaneously on all substrates, keeping the same conditions for the three different catalysts used. Nanowires were investigated by FE-SEM, HR-TEM, and XRD measurements, confirming the morphology and the crystalline structure of the material. Moreover, conductometric sensing devices were fabricated depositing electrodes on top of these materials, and chemical sensing performances were evaluated toward some typical air pollutants. Full article

(This article belongs to the Proceedings of Proceedings of Eurosensors 2017, Paris, France, 3–6 September 2017)

► Show Figures

Figure 1

4 pages, 796 KiB

Open AccessProceeding Paper

The Effect of Monolayer Graphene on the UV Assisted NO₂ Sensing and Recovery at Room Temperature

by Tsung-Cheng Chen, Yu-Cheng Yang, Hui-Ling Liu, Chia-Ming Yang, M. Meyyappan and Chao-Sung Lai

Proceedings 2017, 1(4), 461; https://doi.org/10.3390/proceedings1040461 - 22 Aug 2017

Cited by 5 | Viewed by 2168

Abstract

In the present study, UV light induced desorption of nitrogen dioxide (NO₂) on pristine graphene based gas sensor is used to improve the sensing performance. Compared to the sample without UV light exposure, the response is 12%, 18% and 21% for [...] Read more.

In the present study, UV light induced desorption of nitrogen dioxide (NO₂) on pristine graphene based gas sensor is used to improve the sensing performance. Compared to the sample without UV light exposure, the response is 12%, 18% and 21% for NO₂ concentrations of 1, 3 and 5 ppm. In addition, the recovery could be speeded up by UV irradiation. The sensor shows good behavior of repeatability when tested for 1 ppm of NO₂ in 3 cycles. The graphene sensor with UV irradiation has a higher sensitivity to NO₂ than to other gases under higher concentrations. Full article

(This article belongs to the Proceedings of Proceedings of Eurosensors 2017, Paris, France, 3–6 September 2017)

► Show Figures

Figure 1

4 pages, 2129 KiB

Open AccessProceeding Paper

Improving Sensitivity of a Chemoresistive Hydrogen Sensor by Combining ZIF-8 and ZIF-67 Nanocrystals

by Daniel Matatagui, Arianee Sainz-Vidal, Isabel Gràcia, Eduardo Figueras, Carles Cané and José Saniger

Proceedings 2017, 1(4), 462; https://doi.org/10.3390/proceedings1040462 - 28 Aug 2017

Cited by 3 | Viewed by 3785

Abstract

In the present work, nanostructures of zeolitic imidazolate frameworks (ZIF-8 and ZIF-67) were combined to obtain a novel chemoresistive sensor, improving the sensitivity of ZIF-67 and facilitating measurement of ZIF-8 by decreasing the resistivity. The sensor detected concentrations as low as 10 ppm [...] Read more.

In the present work, nanostructures of zeolitic imidazolate frameworks (ZIF-8 and ZIF-67) were combined to obtain a novel chemoresistive sensor, improving the sensitivity of ZIF-67 and facilitating measurement of ZIF-8 by decreasing the resistivity. The sensor detected concentrations as low as 10 ppm of hydrogen increasing its resistivity about 4.5 times. The response of the sensor was compared with a similar chemoresistive sensor based exclusively on ZIF-67, and the sensitivity was around three times higher in the case of the sensor with ZIFs combination. Full article

(This article belongs to the Proceedings of Proceedings of Eurosensors 2017, Paris, France, 3–6 September 2017)

► Show Figures

Figure 1

4 pages, 544 KiB

Open AccessProceeding Paper

Pt-AlGaN/GaN HEMT-Sensor for Hydrogen Sulfide (H₂S) Detection

by Robert Sokolovskij, Elina Iervolino, Changhui Zhao, Fabio Santagata, Fei Wang, Hongyu Yu, Pasqualina M. Sarro and Guo Qi Zhang

Proceedings 2017, 1(4), 463; https://doi.org/10.3390/proceedings1040463 - 8 Aug 2017

Cited by 3 | Viewed by 3277

Abstract

AlGaN/GaN high electron mobility transistor (HEMT)-sensor with a catalytic Pt-gate is fabricated and tested for toxic H₂S gas detection. AlGaN/GaN was chosen to extend the sensor detection range and to be able to operate at temperatures beyond those allowed by state-of-art [...] Read more.

AlGaN/GaN high electron mobility transistor (HEMT)-sensor with a catalytic Pt-gate is fabricated and tested for toxic H₂S gas detection. AlGaN/GaN was chosen to extend the sensor detection range and to be able to operate at temperatures beyond those allowed by state-of-art Si-FET sensors. Testing was performed using a gas mixing apparatus in dry synthetic air ambient. High sensitivity, ΔI/I₀, 8% for 80 ppm and 0.23% for 0.5 ppm H₂S/air, is achieved at a temperature of 250 °C, with a corresponding ΔI of 617 μA and 18 μA, respectively, indicating suitability of the proposed sensor for industrial gas safety detectors. Full article

(This article belongs to the Proceedings of Proceedings of Eurosensors 2017, Paris, France, 3–6 September 2017)

► Show Figures

Figure 1

4 pages, 300 KiB

Open AccessProceeding Paper

Solid-Contact Reference Electrode for Ion-Selective Sensors

by Van Anh T. Dam, Martijn Goedbloed and Marcel A. G. Zevenbergen

Proceedings 2017, 1(4), 464; https://doi.org/10.3390/proceedings1040464 - 25 Aug 2017

Cited by 4 | Viewed by 3203

Abstract

This work presents a flexible miniaturized ion-selective sensor consisting of a solid-contact reference electrode (RE) and ion-selective electrodes (ISE) fabricated on the same foil. The flexible ion sensor was based on AgCl electrodes screen printed on polyethylene terephthalate foil. The RE was formed [...] Read more.

This work presents a flexible miniaturized ion-selective sensor consisting of a solid-contact reference electrode (RE) and ion-selective electrodes (ISE) fabricated on the same foil. The flexible ion sensor was based on AgCl electrodes screen printed on polyethylene terephthalate foil. The RE was formed by casting a mixture of plasticized polyvinylchloride (PVC) and KCl on the AgCl electrode. The ISE consisted of a stack of AgCl electrode, cellulose gel layer loaded with 0.1 M KCl, and plasticized PVC based ion-selective membrane containing ionophores. The flexible ion sensor showed a sensitivity close to the Nernstian value in a biological relevant range. Full article

(This article belongs to the Proceedings of Proceedings of Eurosensors 2017, Paris, France, 3–6 September 2017)

► Show Figures

Figure 1

5 pages, 818 KiB

Open AccessProceeding Paper

Study of a Layered Au, Pt-YSZ Mixed-Potential Sensing Electrode by ESEM, XRD and GD-OES with Relation to Its Electrochemical Behaviour

by Xin Zhang, Heinz Kohler, Matthias Schwotzer, Yanhong Wu and Ulrich Guth

Proceedings 2017, 1(4), 465; https://doi.org/10.3390/proceedings1040465 - 22 Aug 2017

Cited by 1 | Viewed by 2976

Abstract

Morphological and structural properties of layered Au, Pt-YSZ mixed-potential gas sensing electrodes (APE) prepared under different temperature treatments were studied by environmental scanning electron microscope (ESEM) and glow-discharge optical emission spectroscopy (GD-OES), and correlated with open-circuit potential (OCP) and cyclic voltammetry (CV) measurements [...] Read more.

Morphological and structural properties of layered Au, Pt-YSZ mixed-potential gas sensing electrodes (APE) prepared under different temperature treatments were studied by environmental scanning electron microscope (ESEM) and glow-discharge optical emission spectroscopy (GD-OES), and correlated with open-circuit potential (OCP) and cyclic voltammetry (CV) measurements under gas exposures at elevated temperatures. The OCP response of the APE sintered at 1050 °C is clearly higher than that of the APE sintered at 850 °C, and can be well correlated with a smaller oxygen reduction reaction (ORR) observed in the related CV diagrams. Moreover, a transition from the charge transfer reaction kinetics to the diffusional transport controlled mixed-potential formation was found between 550 °C and 650 °C. Full article

(This article belongs to the Proceedings of Proceedings of Eurosensors 2017, Paris, France, 3–6 September 2017)

► Show Figures

Figure 1

5 pages, 1475 KiB

Open AccessProceeding Paper

H₂-Sensing Performance of 2D WO₃ Nanostructure—Effect of Anodization Parameter

by Anurat Wisitsora-at, Ditsayut Phokaratkul, Kata Jaruwongrangsee, Thitima M. Daniels and Wojtek Wlodarski

Proceedings 2017, 1(4), 466; https://doi.org/10.3390/proceedings1040466 - 17 Aug 2017

Cited by 1 | Viewed by 2042

Abstract

In this work, we investigate the effect of HNO₃ anodizing solution concentration ranging from 1.5 to 3 M on H₂-sensing performance of 2D WO₃ nanostructures prepared by anodizing sputtered tungsten films. The thickness of WO₃ nanosheets was found [...] Read more.

In this work, we investigate the effect of HNO₃ anodizing solution concentration ranging from 1.5 to 3 M on H₂-sensing performance of 2D WO₃ nanostructures prepared by anodizing sputtered tungsten films. The thickness of WO₃ nanosheets was found to reduce while the crystallinity degraded with increasing HNO₃ concentration. However, the nanosheets anodized in 2 M HNO₃ exhibited the highest response of 43.4 to 1 vol % H₂, which was one order of magnitude larger than those fabricated with other concentrations at the optimal operating temperature of 350 °C. In addition, the optimal nanostructures displayed good H₂ selectivity against NO₂, CH₄, C₂H₂ and C₂H₅OH. Full article

(This article belongs to the Proceedings of Proceedings of Eurosensors 2017, Paris, France, 3–6 September 2017)

► Show Figures

Figure 1

4 pages, 1103 KiB

Open AccessProceeding Paper

3D Graphene-Carbon Nanotubes-Polydimethyl Siloxane Flexible Electrodes for Simultaneous Electrochemical Detections of Hg, Pb and Cd

by Thitima M. Daniels, Saithip Pakapongpan, Ditsayut Phokharatkul, Kata Jaruwongrangsee, Kwandara Maturos, Adisorn Tuantranont and Anurat Wisitsora-at

Proceedings 2017, 1(4), 467; https://doi.org/10.3390/proceedings1040467 - 18 Aug 2017

Cited by 1 | Viewed by 2149

Abstract

In this work, the effect of CNTs content in 3D graphene-PDMS-CNTs electrodes were systematically studied for simultaneous determination of Hg, Pb and Cd by differential pulse anodic stripping voltammetry. The composites were formed by dip coating CVD graphene on Ni foam in CNTs-dispersed [...] Read more.

In this work, the effect of CNTs content in 3D graphene-PDMS-CNTs electrodes were systematically studied for simultaneous determination of Hg, Pb and Cd by differential pulse anodic stripping voltammetry. The composites were formed by dip coating CVD graphene on Ni foam in CNTs-dispersed PDMS solution with varying CNTs concentrations. The optimal CNTs content was found to be ~0.5 mg/mL for all analytes. The optimal graphene-PDMS-CNTs electrode showed good analytical performances with sharp well-separated peaks of Pb, Hg and Cd in the concentration range of 100–500 μg/L. Therefore, the graphene-PDMS-CNTs electrode is highly promising for multiple detections of heavy metal pollutants. Full article

(This article belongs to the Proceedings of Proceedings of Eurosensors 2017, Paris, France, 3–6 September 2017)

► Show Figures

Figure 1

5 pages, 578 KiB

Open AccessProceeding Paper

Individual Gallium Oxide Nanowires for Humidity Sensing at Low Temperature

by Guillem Domènech-Gil, Irmina Peiró Riera, Elena López-Aymerich, Paolo Pellegrino, Sven Barth, Isabel Gràcia, Carles Cané, Juan Daniel Prades, Mauricio Moreno-Sereno and Albert Romano-Rodriguez

Proceedings 2017, 1(4), 468; https://doi.org/10.3390/proceedings1040468 - 8 Aug 2017

Cited by 3 | Viewed by 2361

Abstract

Gallium oxide nanowires (NWs) were synthetized using a vapor-liquid-solid route via carbothermal reduction. These NWs were characterized using XRD, SEM and TEM as well as photoluminescence spectroscopy, confirming their crystalline nature. Gas sensors, based on individual NWs, deposited on suspended microhotplates, were tested [...] Read more.

Gallium oxide nanowires (NWs) were synthetized using a vapor-liquid-solid route via carbothermal reduction. These NWs were characterized using XRD, SEM and TEM as well as photoluminescence spectroscopy, confirming their crystalline nature. Gas sensors, based on individual NWs, deposited on suspended microhotplates, were tested towards several gases of interest at different temperatures. The sensing towards relative humidity provided the best results, with responses up to 20% at room temperature (~25 °C). Full article

(This article belongs to the Proceedings of Proceedings of Eurosensors 2017, Paris, France, 3–6 September 2017)

► Show Figures

Figure 1

4 pages, 268 KiB

Open AccessProceeding Paper

GO/2D WS₂ Based Humidity Sensor

by Elisabetta Comini, Gorgio Sberveglieri, Anurat Wisitsora-at, Zdenek Sofer, Carmen C. Mayorga Martinez, Martin Pumera and Wojtek Wlodarski

Proceedings 2017, 1(4), 469; https://doi.org/10.3390/proceedings1040469 - 11 Oct 2017

Cited by 2 | Viewed by 2446

Abstract

In this work, 2D WS₂ nanosheets prepared by the exfoliation of WS₂ with Li-intercalation was combined with GO produced by the Hummer method for humidity sensing applications. The GO and WS₂ solutions were mixed with an equal concentration and coated [...] Read more.

In this work, 2D WS₂ nanosheets prepared by the exfoliation of WS₂ with Li-intercalation was combined with GO produced by the Hummer method for humidity sensing applications. The GO and WS₂ solutions were mixed with an equal concentration and coated on conductometric transducers. Sensing measurements towards humidity (0–80% RH) at room temperature revealed that the humidity response of hybrid was substantially higher by a factor of 3–9 depending on the RH value compared with those of GO and WS₂. Moreover, no cross sensitivity to common gaseous compounds was observed. Therefore, the GO/2D WS₂ composite is a highly promising humidity sensor. Full article

(This article belongs to the Proceedings of Proceedings of Eurosensors 2017, Paris, France, 3–6 September 2017)

► Show Figures

Figure 1

5 pages, 661 KiB

Open AccessProceeding Paper

Design, Fabrication and Optimization of a Silicon MEMS Natural Gas Sensor

by Marjan Shaker, Erik Sundfør, Gaël Farine, Conor Slater, Pierre-André Farine and Danick Briand

Proceedings 2017, 1(4), 470; https://doi.org/10.3390/proceedings1040470 - 17 Aug 2017

Cited by 2 | Viewed by 2266

Abstract

This study reports on the integration of a Silicon MEMS hotplate into a natural gas quality analyzer, i.e., a miniaturized gas viscometer used to measure the Wobbe Index (WI). COMSOL Multiphysics simulation was used for selection of the optimum geometry of the hotplate [...] Read more.

This study reports on the integration of a Silicon MEMS hotplate into a natural gas quality analyzer, i.e., a miniaturized gas viscometer used to measure the Wobbe Index (WI). COMSOL Multiphysics simulation was used for selection of the optimum geometry of the hotplate and gas sensing cell. Experimental characterization of the hotplate confirmed its stability under working condition of the sensor. The sensor has been tested by running various gases such as Nitrogen and Methane. The thermal analysis of the sensor and experimental results show a reduced response time of the sensor at lower power consumption and lower thermal time constant. Full article

(This article belongs to the Proceedings of Proceedings of Eurosensors 2017, Paris, France, 3–6 September 2017)

► Show Figures

Figure 1

4 pages, 323 KiB

Open AccessProceeding Paper

NO₂ Measurements with RGB Sensors for Easy In-Field Test

by Luis Fernández, Alba Pons, Oriol Monereo, Ismael Benito-Altamirano, Elena Xuriguera, Olga Casals, Cristian Fàbrega, Andreas Waag and Joan Daniel Prades

Proceedings 2017, 1(4), 471; https://doi.org/10.3390/proceedings1040471 - 25 Aug 2017

Cited by 2 | Viewed by 2013

Abstract

We present a simple an inexpensive method to implement a Griess-Saltzman-type reaction that combines the advantages of the liquid phase method (high specificity, fast response time) with the benefits of a solid implementation (easy to handle). We demonstrate that the measurements can be [...] Read more.

We present a simple an inexpensive method to implement a Griess-Saltzman-type reaction that combines the advantages of the liquid phase method (high specificity, fast response time) with the benefits of a solid implementation (easy to handle). We demonstrate that the measurements can be carried out using conventional RGB sensors; circumventing all the limitations around the measurement of the samples with spectrometers. We also present a method to optimize the measurement protocol and target a specific range of NO₂ concentrations. We demonstrate that it is possible to measure the concentration of NO₂ from 50 ppb to 300 ppm with high specificity and without modifying the sensing elements. Full article

(This article belongs to the Proceedings of Proceedings of Eurosensors 2017, Paris, France, 3–6 September 2017)

► Show Figures

Figure 1

5 pages, 610 KiB

Open AccessProceeding Paper

Capacitive CO₂Sensor

by Jamila Boudaden, Armin Klumpp, Hanns-Erik Endres and Ignaz Eisele

Proceedings 2017, 1(4), 472; https://doi.org/10.3390/proceedings1040472 - 11 Aug 2017

Cited by 8 | Viewed by 2742

Abstract

The objective of the present paper is to provide a concept for a chemical sensor having a small size, a low power consumption and a high reliability for sensing CO₂ under different humidity levels at atmospheric pressure, while maintaining a long term [...] Read more.

The objective of the present paper is to provide a concept for a chemical sensor having a small size, a low power consumption and a high reliability for sensing CO₂ under different humidity levels at atmospheric pressure, while maintaining a long term stability under working conditions. A high temperature regeneration process of the sensing layer is unneeded to ensure a long term stability of the sensing material. This objective is achieved by using a hybrid organic-inorganic nanomaterial, consisting of inorganic nanoparticles functionalized with an amine-based polymer. Full article

(This article belongs to the Proceedings of Proceedings of Eurosensors 2017, Paris, France, 3–6 September 2017)

► Show Figures

Figure 1

4 pages, 452 KiB

Open AccessProceeding Paper

Cairsens NO₂: A Miniature Device Dedicated to the Indicative Measurement of Nitrogen Dioxide in Ambient Air

by Brice Berthelot, Azzédine Ben Daoud, Brice Hellio and Rony Akiki

Proceedings 2017, 1(4), 473; https://doi.org/10.3390/proceedings1040473 - 28 Aug 2017

Cited by 2 | Viewed by 2085

Abstract

This paper reports the study of data quality of Cairsens NO₂ environmental sensors. In order to evaluate sensors performances, the investigation was performed through: a prospective follow-up of short-term and long terms drifts, the evaluation of the effects of environmental conditions upon [...] Read more.

This paper reports the study of data quality of Cairsens NO₂ environmental sensors. In order to evaluate sensors performances, the investigation was performed through: a prospective follow-up of short-term and long terms drifts, the evaluation of the effects of environmental conditions upon sensors measurements as well as the evaluation of the ozone-filter lifetime. In this purpose, a dedicated test bench has been developed to expose sensors to a fixed concentration of ozone while recording sensors response. Full article

(This article belongs to the Proceedings of Proceedings of Eurosensors 2017, Paris, France, 3–6 September 2017)

► Show Figures

Figure 1

4 pages, 510 KiB

Open AccessProceeding Paper

Detection of Ethanol in Human Breath Using Optical Fiber Long Period Grating Coated with Metal-Organic Frameworks

by Nerea De Acha, Jiri Hromadka, Begum Tokay, Ricardo Correia, Cesar Elosua, Ignacio R. Matías, Francisco J. Arregui, Stephen P. Morgan and Sergiy Korposh

Proceedings 2017, 1(4), 474; https://doi.org/10.3390/proceedings1040474 - 21 Aug 2017

Cited by 1 | Viewed by 2595

Abstract

An optical fiber sensor for ethanol detection in exhaled breath has been developed. It has been fabricated by functionalizing a Long Period Grating with a metal-organic framework, ZIF-8. The sensor’s response was tested by exposure to exhaled breath of a person before and [...] Read more.

An optical fiber sensor for ethanol detection in exhaled breath has been developed. It has been fabricated by functionalizing a Long Period Grating with a metal-organic framework, ZIF-8. The sensor’s response was tested by exposure to exhaled breath of a person before and after the ingestion of alcoholic drinks, showing a higher wavelength difference between the resonance bands in the second case. Further work will analyze cross-sensitivity towards temperature, relative humidity and carbon dioxide. Full article

(This article belongs to the Proceedings of Proceedings of Eurosensors 2017, Paris, France, 3–6 September 2017)

► Show Figures

Figure 1

4 pages, 374 KiB

Open AccessProceeding Paper

Sensitivity to Heavy-Metal Ions of Cage-Opening Fullerene Quantum Dots

by Erica Ciotta, Paolo Prosposito, Pietro Tagliatesta, Chiara Lorecchio, Iole Venditti, Ilaria Fratoddi and Roberto Pizzoferrato

Proceedings 2017, 1(4), 475; https://doi.org/10.3390/proceedings1040475 - 19 Aug 2017

Cited by 1 | Viewed by 1904

Abstract

In this study, we have carried out a characterization of the quenching effect produced by some commonly encountered metal ions (Co²⁺, Cu²⁺, Ni²⁺, Pb²⁺, Cd²⁺, As⁵⁺) on the photoluminescence of water [...] Read more.

In this study, we have carried out a characterization of the quenching effect produced by some commonly encountered metal ions (Co²⁺, Cu²⁺, Ni²⁺, Pb²⁺, Cd²⁺, As⁵⁺) on the photoluminescence of water suspensions of open-cage fullerene quantum dots prepared with a modified Hummers method. The response to heavy-metal ions occurs through a selective quenching of the PL emission and modifications of the absorption spectrum. Full article

(This article belongs to the Proceedings of Proceedings of Eurosensors 2017, Paris, France, 3–6 September 2017)

► Show Figures

Figure 1

4 pages, 894 KiB

Open AccessProceeding Paper

Separation of Sensitivity Contributions in Tin Oxide Thick Film Sensors by Transmission Line Model Measurements at Isothermal and Thermally Modulated Operation

by Jens Knoblauch, Krupakar Murugavel, Heinz Kohler and Ulrich Guth

Proceedings 2017, 1(4), 476; https://doi.org/10.3390/proceedings1040476 - 9 Aug 2017

Cited by 1 | Viewed by 1885

Abstract

Transmission line modelling (TLM) techniques were used to study the sensitivity behaviour to CO and propene in distinct regions of tin oxide thick film gas sensors operated in isothermal and thermo-cyclic mode. The sensitive layer showed an increased sensitivity to propene in the [...] Read more.

Transmission line modelling (TLM) techniques were used to study the sensitivity behaviour to CO and propene in distinct regions of tin oxide thick film gas sensors operated in isothermal and thermo-cyclic mode. The sensitive layer showed an increased sensitivity to propene in the vicinity of the Pt electrodes at isothermal operation and pronounced specific features at thermo-cyclic operation. Simulation by Finite Element Analysis (FAE) gives insight into the electrical behaviour of the contact area and enables a detailed analysis of the thickness dependence of sensitivity effects. Full article

(This article belongs to the Proceedings of Proceedings of Eurosensors 2017, Paris, France, 3–6 September 2017)

► Show Figures

Figure 1

4 pages, 1026 KiB

Open AccessProceeding Paper

Restraining the Diffusion of Photocarriers to Improve the Spatial Resolution of the Chemical Imaging Sensor

by Ko-ichiro Miyamoto, Takeyuki Suto, Carl Frederik Werner, Torsten Wagner, Michael J. Schöning and Tatsuo Yoshinobu

Proceedings 2017, 1(4), 477; https://doi.org/10.3390/proceedings1040477 - 3 Aug 2017

Cited by 1 | Viewed by 1716

Abstract

The chemical imaging sensor is capable of visualizing the ion distribution. The spatial resolution of the chemical image depends on the horizontal diffusion of photocarriers generated by illumination. In this study; a novel optics is designed to realize a hybrid illumination of a [...] Read more.

The chemical imaging sensor is capable of visualizing the ion distribution. The spatial resolution of the chemical image depends on the horizontal diffusion of photocarriers generated by illumination. In this study; a novel optics is designed to realize a hybrid illumination of a ring of constant light and a spot of modulated light. Improved spatial resolution of the order of few tens of microns was successfully demonstrated. Full article

(This article belongs to the Proceedings of Proceedings of Eurosensors 2017, Paris, France, 3–6 September 2017)

► Show Figures

Figure 1

5 pages, 745 KiB

Open AccessProceeding Paper

Dual Gate Microsensors and Nanomaterials for Chemical Detection

by Laetitia Donero, Laurent Le Brizoual, Abel Aziz El Mel, Pierre-Yves Tessier and France Le Bihan

Proceedings 2017, 1(4), 478; https://doi.org/10.3390/proceedings1040478 - 11 Aug 2017

Viewed by 1818

Abstract

New chemical sensors are developed for suitable applications in biochemistry and biology, especially for the easy measurement of low concentrations of chemical and biological elements in liquid media. Robust devices, able to detect a small charge variation, can be associated with nanomaterials on [...] Read more.

New chemical sensors are developed for suitable applications in biochemistry and biology, especially for the easy measurement of low concentrations of chemical and biological elements in liquid media. Robust devices, able to detect a small charge variation, can be associated with nanomaterials on the active surface of the sensor. Sensors based on microelectronic technologies and having high sensitivities due to their specific Dual Gate structure are shown. We demonstrate that, under optimum polarization conditions, the sensor exhibits a high sensitivity for pH variations. The integration of several types of nanomaterials on the active surface of the microsensors is also demonstrated and validated for further biological detections Full article

(This article belongs to the Proceedings of Proceedings of Eurosensors 2017, Paris, France, 3–6 September 2017)

► Show Figures

Figure 1

4 pages, 1473 KiB

Open AccessProceeding Paper

Aryl-Diazonium Functionalized Polycrystalline Silicon Nanoribbons Based Device for Lead Detection

by Brice Le Borgne, Anne-Claire Salaün, Laurent Pichon and Florence Geneste

Proceedings 2017, 1(4), 479; https://doi.org/10.3390/proceedings1040479 - 28 Aug 2017

Cited by 2 | Viewed by 2022

Abstract

Development of sensors enabling lead traces detection is a burning issue as heavy metals ions are responsible of brain diseases. In this paper, we present a simple electronic resistor based on polycrystalline silicon nanoribbons and functionalized with aryl-diazonium salts in view of using [...] Read more.

Development of sensors enabling lead traces detection is a burning issue as heavy metals ions are responsible of brain diseases. In this paper, we present a simple electronic resistor based on polycrystalline silicon nanoribbons and functionalized with aryl-diazonium salts in view of using this type of structures for heavy metal detection. The preconcentration of lead at the surface of the functionalized nanostructures has been checked. Finally, electrical characterization of the resistors showed that the sensor sensitivity to these species is improved thanks to functionalization in the range 10⁻⁷ to 10⁻⁵ mol·L⁻¹. Full article

(This article belongs to the Proceedings of Proceedings of Eurosensors 2017, Paris, France, 3–6 September 2017)

► Show Figures

Figure 1

4 pages, 3049 KiB

Open AccessProceeding Paper

Conducting Polymers for Ammonia Sensing: Electrodeposition, Hybrid Materials and Heterojunctions

by M. Bouvet, M. Mateos, R. Meunier-Prest and J.-M. Suisse

Proceedings 2017, 1(4), 480; https://doi.org/10.3390/proceedings1040480 - 7 Aug 2017

Viewed by 1766

Abstract

Polyaniline (PANI) with electrodonating and electrowithdrawing substituents were electrodeposited and studied as sensing materials in resistors and heterojunctions. Whereas the dimethoxyaniline leads to a highly conductive material, the tetrafluoroaniline leads to a poor conducting polymer. However, this latter was used in heterojunctions, associated [...] Read more.

Polyaniline (PANI) with electrodonating and electrowithdrawing substituents were electrodeposited and studied as sensing materials in resistors and heterojunctions. Whereas the dimethoxyaniline leads to a highly conductive material, the tetrafluoroaniline leads to a poor conducting polymer. However, this latter was used in heterojunctions, associated with a highly conductive material, the lutetium bisphthalocyanine LuPc₂. Elsewhere, hybrid materials combining polypyrrole (PPy) with ionic macrocycles as counterions were also electrosynthesized and used as sensing material in resistors, for the detection of ammonia. They exhibit a higher sensitivity compared to PPy prepared with small counterions, with a stable response in a broad range of relative humidity. Full article

(This article belongs to the Proceedings of Proceedings of Eurosensors 2017, Paris, France, 3–6 September 2017)

► Show Figures

Figure 1

4 pages, 351 KiB

Open AccessProceeding Paper

A Highly Sensitive Potentiometric Amphetamine Microsensor Based on All-Solid-State Membrane Using a New Ion-Par Complex, [3,3′-Co(1,2-closo-C₂B₉H₁₁)₂]⁻ C₉H₁₃NH⁺

by J. Gallardo-Gonzalez, A. Baraket, S. Boudjaoui, Y. Clément, A. Alcácer, A. Streklas, F. Teixidor, N. Zine, J. Bausells and A. Errachid

Proceedings 2017, 1(4), 481; https://doi.org/10.3390/proceedings1040481 - 7 Aug 2017

Cited by 1 | Viewed by 1855

Abstract

In the present work a highly sensitive ion-selective microelectrode for the detection of amphetamine is presented. For this purpose, a novel ion-par complex based on the metallocarborane, cobalt bis(dicarbollide) anion ([3,3′-Co(1,2-C₂B₉H₁₁)₂]⁻) coupled to [...] Read more.

In the present work a highly sensitive ion-selective microelectrode for the detection of amphetamine is presented. For this purpose, a novel ion-par complex based on the metallocarborane, cobalt bis(dicarbollide) anion ([3,3′-Co(1,2-C₂B₉H₁₁)₂]⁻) coupled to amphetamonium cation has been prepared as the active site for amphetamine recognition. The prepared ion-par complex was incorporated to a PVC-type sensitive membrane. It was then drop-casted on the top of a gold microelectrode previously modified with a solid contact layer of polypyrrole. This novel amphetamine microsensor has provided excellent and quick response within the range 10⁻⁵ M to 10⁻³ M of amphetamine concentration, a limit of detection of 12 µM and a slope of 60.1 mV/decade. It was also found to be highly selective toward some potential interference compounds when compared to amphetamine. Full article

(This article belongs to the Proceedings of Proceedings of Eurosensors 2017, Paris, France, 3–6 September 2017)

► Show Figures

Figure 1

4 pages, 536 KiB

Open AccessProceeding Paper

A Novel, Low-Cost, Portable PID Sensor for Detection of VOC

by Samuel O. Agbroko and James Covington

Proceedings 2017, 1(4), 482; https://doi.org/10.3390/proceedings1040482 - 7 Aug 2017

Cited by 1 | Viewed by 3050

Abstract

A low cost portable photoionization (PID) sensor was successfully designed and manufactured. Unlike existing commercial PID sensors, our device provides two outputs, one associated with the total chemical components and a second that provides some level of compositional information. We believe that this [...] Read more.

A low cost portable photoionization (PID) sensor was successfully designed and manufactured. Unlike existing commercial PID sensors, our device provides two outputs, one associated with the total chemical components and a second that provides some level of compositional information. We believe that this makes this sensor system more useful than a standard PID, with a similar, if not lower, cost point. Our PID sensor was tested with gas concentrations down to 2 ppm isobutylene. These results indicate that the limit of detection will be well below 1 ppm. Further detection tests were carried out with ethanol, acetone and isobutylene, which showed similar sensitivities. Compositional measurements were also undertaken and the results presented shows our sensor can discriminate successfully between low concentration isobutylene and 2-pentanone. Full article

(This article belongs to the Proceedings of Proceedings of Eurosensors 2017, Paris, France, 3–6 September 2017)

► Show Figures

Figure 1

4 pages, 748 KiB

Open AccessProceeding Paper

Design of Novel Electrochemical Sensors for the Selective Detection of Glyphosate

by Zouhour Mazouz, Zouhair Ait Touchente, Houria Laradi, Najla Fourati, Nourdin Yaakoubi, Rachid Touzani, Mohamed M. Chehimi, Rafik Kalfat, Ali Othmane and Chouki Zerrouki

Proceedings 2017, 1(4), 483; https://doi.org/10.3390/proceedings1040483 - 8 Aug 2017

Cited by 5 | Viewed by 2699

Abstract

This study concerns the development of two molecularly imprinted polymers (MIP) based electrochemical sensors for glyphosate detection. In both cases polypyrrole (PPy) was chosen as matrix and glyphosate molecules were the templates. The main difference between the two strategies is related to the [...] Read more.

This study concerns the development of two molecularly imprinted polymers (MIP) based electrochemical sensors for glyphosate detection. In both cases polypyrrole (PPy) was chosen as matrix and glyphosate molecules were the templates. The main difference between the two strategies is related to the investigated electrode: gold surface in the first case, and ZnO nanorods vertically grown on ITO diazonium modified substrates in the second case. The limits of detection (LOD) of these sensors were about 10⁻¹³ M and 10⁻¹⁰ M respectively. Full article

(This article belongs to the Proceedings of Proceedings of Eurosensors 2017, Paris, France, 3–6 September 2017)

► Show Figures

Figure 1

4 pages, 1000 KiB

Open AccessProceeding Paper

High-Performance Ammonia Sensor at Room Temperature Based on a Love-Wave Device with Fe₂O₃@WO₃−x Nanoneedles

by F. A. Bahos, S. Vallejos, Isabel Gràcia, C. Cané, M. J. Fernández, M. C. Horrillo and Daniel Matatagui

Proceedings 2017, 1(4), 484; https://doi.org/10.3390/proceedings1040484 - 25 Aug 2017

Cited by 5 | Viewed by 1953

Abstract

An innovative, simple and inexpensive Love-wave gas sensor based on Fe₂O₃@WO₃−x nanoneedles to detect the variation of ammonia at room temperature was developed. The nanoneedles were successfully formed on Love-wave device via aerosol-assisted chemical vapor deposition (AACVD). [...] Read more.

An innovative, simple and inexpensive Love-wave gas sensor based on Fe₂O₃@WO₃−x nanoneedles to detect the variation of ammonia at room temperature was developed. The nanoneedles were successfully formed on Love-wave device via aerosol-assisted chemical vapor deposition (AACVD). The nanoneedles worked as guiding and sensitive layers detecting the changes of the elastic properties presented by ammonia interaction. The sensor was tested to ammonia concentrations between 25 to 90 ppm and showed large frequency shifts, high sensibility, short response time and good reproducibility. Full article

(This article belongs to the Proceedings of Proceedings of Eurosensors 2017, Paris, France, 3–6 September 2017)

► Show Figures

Figure 1

5 pages, 680 KiB

Open AccessProceeding Paper

Ultrasensitive Gas Sensors Based on Electrospun TiO₂ and ZnO

by Ambra Fioravanti, Sara Morandi, Alberto Rubin Pedrazzo, Pierangiola Bracco, Marco Zanetti, Maela Manzoli, Mauro Mazzocchi and Maria Cristina Carotta

Proceedings 2017, 1(4), 485; https://doi.org/10.3390/proceedings1040485 - 5 Sep 2017

Cited by 1 | Viewed by 2457

Abstract

New sensors for detecting gases at low concentration were successfully developed. Two metal oxide materials, zinc oxide and titanium dioxide, usually employed both in gas sensing as well as in photocatalytic application, were synthesized both through a traditional sol-gel method and an electrospinning [...] Read more.

New sensors for detecting gases at low concentration were successfully developed. Two metal oxide materials, zinc oxide and titanium dioxide, usually employed both in gas sensing as well as in photocatalytic application, were synthesized both through a traditional sol-gel method and an electrospinning technique. The corresponding thick films were considered with respect to the target gases (acetone for ZnO and carbon monoxide for TiO₂) for comparing their functional properties. Full article

(This article belongs to the Proceedings of Proceedings of Eurosensors 2017, Paris, France, 3–6 September 2017)

► Show Figures

Figure 1

5 pages, 770 KiB

Open AccessProceeding Paper

Investigation of the Salt Concentration Dependence of Water-Gated Field Effect Transistors (WG-FET) Using 16-nm-Thick Single Crystalline Si Film

by Ozan Ertop, Bedri Gurkan Sonmez and Senol Mutlu

Proceedings 2017, 1(4), 486; https://doi.org/10.3390/proceedings1040486 - 9 Aug 2017

Cited by 2 | Viewed by 2101

Abstract

This paper presents the effect of NaCl concentration on the operation of a water-gated field effect transistor (WG-FET) that uses 16-nm-thick single crystalline silicon (Si) film. In WG-FET, electrical double layer (EDL) formed at the water/silicon interface behaves as gate dielectric and this [...] Read more.

This paper presents the effect of NaCl concentration on the operation of a water-gated field effect transistor (WG-FET) that uses 16-nm-thick single crystalline silicon (Si) film. In WG-FET, electrical double layer (EDL) formed at the water/silicon interface behaves as gate dielectric and this fluidic interface makes WG-FET a suitable device for sensing applications. Characteristics of EDL and the threshold voltage of WG-FET depend on the molarity of solution. Increasing the molarity of NaCl solution from 0.5 to 65 mM changes the threshold voltage from 360 to 465 mV. Accordingly, drain current of the WG-FET device changes with NaCl concentration. Full article

(This article belongs to the Proceedings of Proceedings of Eurosensors 2017, Paris, France, 3–6 September 2017)

► Show Figures

Figure 1

5 pages, 1370 KiB

Open AccessProceeding Paper

Oxyhydrogen and Hydrogen Detection by Gasochromic Coloration of Highly Porous Tungsten Oxide with Fractal-Like Pd Nanoparticles

by Mehdi Ranjbar and Giorgio Sberveglieri

Proceedings 2017, 1(4), 487; https://doi.org/10.3390/proceedings1040487 - 28 Aug 2017

Cited by 2 | Viewed by 1945

Abstract

WO₃ thin films were deposited by pulsed laser deposition (PLD) on glass substrates at 100 mTorr oxygen pressure. Monodispersed palladium nanoparticles (50 nm) were synthesized by hydrogen reduction of PdCl₂ drop-casted on the surface of the films. For oxyhydrogen detection, first [...] Read more.

WO₃ thin films were deposited by pulsed laser deposition (PLD) on glass substrates at 100 mTorr oxygen pressure. Monodispersed palladium nanoparticles (50 nm) were synthesized by hydrogen reduction of PdCl₂ drop-casted on the surface of the films. For oxyhydrogen detection, first a saturated coloration by 10%H₂/Ar was prepared. Then different oxygen flow with certain O₂:H₂ ratios were exposed to the colored samples. Depending on this ratio, the optical density of samples was observed to drop into certain new values until vanishes for a ratio about 20. A desirable fast coloration with linear dependency on hydrogen concentration was also observed. Full article

(This article belongs to the Proceedings of Proceedings of Eurosensors 2017, Paris, France, 3–6 September 2017)

► Show Figures

Figure 1

4 pages, 334 KiB

Open AccessProceeding Paper

Carbon Dots and Fluorescein: The Ideal FRET Pair for the Fabrication of a Precise and Fully Reversible Ammonia Sensor

by Chao-Peng Hsu, Zahralsaadat Hejazi, Efe Armagan, Shanyu Zhao, Michel Schmid, Haijiang Zhang, Huizhang Guo, Lukas Weidenbacher, René M. Rossi, Matthias M. Koebel, Luciano F. Boesel and Claudio Toncelli

Proceedings 2017, 1(4), 488; https://doi.org/10.3390/proceedings1040488 - 7 Aug 2017

Cited by 1 | Viewed by 2034

Abstract

Monitoring of ammonia in the human breath is of paramount importance to monitor diseases link to liver and kidney mulfunctioning. The present paper describes a solid-state optical ammonia sensor based on Förster resonance energy transfer (FRET) between narrowly dispersed blue-emitting carbon nanodots (CNDs) [...] Read more.

Monitoring of ammonia in the human breath is of paramount importance to monitor diseases link to liver and kidney mulfunctioning. The present paper describes a solid-state optical ammonia sensor based on Förster resonance energy transfer (FRET) between narrowly dispersed blue-emitting carbon nanodots (CNDs) as FRET donor and fluorescein as FRET acceptor. The fluorophores were physically entrapped in a close to superhydrophobic sol-gel matrix, in turn deposited on a PVDF-HFP electrospun fiber membrane. The sensor shows a linear calibration with a remarkably low limit of detection, i.e., 110 ppb, and adequate reproducibility up to six N₂/NH₃ cycles. Full article

(This article belongs to the Proceedings of Proceedings of Eurosensors 2017, Paris, France, 3–6 September 2017)

► Show Figures

Figure 1

3 pages, 254 KiB

Open AccessProceeding Paper

E-tongue based on Porphyrin Electropolymers for Apulian Red Wines Defects Detection

by Larisa Lvova, Corrado Di Natale and Roberto Paolesse

Proceedings 2017, 1(4), 489; https://doi.org/10.3390/proceedings1040489 - 8 Aug 2017

Viewed by 1764

Abstract

An application of e-tongue based on porphyrin electropolymers for the detection of Primitivo and Negroamaro wines defects related to the presence of “off-odor” methiol (3-(methylthio)-propanol), isoamyl alcohol fusel oil, the marker of the yeast activity benzaldehyde and vinegar formation marker acetic acid was [...] Read more.

An application of e-tongue based on porphyrin electropolymers for the detection of Primitivo and Negroamaro wines defects related to the presence of “off-odor” methiol (3-(methylthio)-propanol), isoamyl alcohol fusel oil, the marker of the yeast activity benzaldehyde and vinegar formation marker acetic acid was investigated. The best results were obtained for acetic acid and isoamyl alcohol. Further the Soft Independent Modelling by Class Analogy, SIMCA, classification models and Partial Least Squares-Discriminant Analysis, PLS-DA, were employed to distinguish real wine samples with different (permitted and alarm levels) fault compounds content as far as two types of wines among them. Full article

(This article belongs to the Proceedings of Proceedings of Eurosensors 2017, Paris, France, 3–6 September 2017)

► Show Figures

Figure 1

4 pages, 600 KiB

Open AccessProceeding Paper

Detection of NOx in Combustion Engine Exhaust Gas by Applying the Pulsed Polarization Technique on YSZ Based Sensors

by Roland Pohle, Erhard Magori, Angelika Tawil, Polina Davydovskaya and Maximilian Fleischer

Proceedings 2017, 1(4), 490; https://doi.org/10.3390/proceedings1040490 - 9 Aug 2017

Cited by 4 | Viewed by 2240

Abstract

The pulsed polarization measurement technique applied on sensor devices based on yttria stabilized zirconia (YSZ) with porous platinum electrodes enables the detection of low ppm concentrations of NOx in exhaust gas applications with a simple device. Pulsed polarization is based on alternating voltage [...] Read more.

The pulsed polarization measurement technique applied on sensor devices based on yttria stabilized zirconia (YSZ) with porous platinum electrodes enables the detection of low ppm concentrations of NOx in exhaust gas applications with a simple device. Pulsed polarization is based on alternating voltage pulses with intermediate pauses for self discharging. The discharge characteristics after polarization depends strongly on NOx content in the low ppm range. Due to faster discharging in NOx containing atmospheres compared to base gas, the voltage difference between the discharge curves can act as a concentration dependent parameter. Sensor probes for usage in exhaust gas conditions have been built. The feasibility of NOx sensing in diesel exhaust gas by use of a planar cost-effective YSZ sensor element is evaluated in detail in comparison to commercial NOx exhaust sensors and referenced with gas analysis equipment. Full article

(This article belongs to the Proceedings of Proceedings of Eurosensors 2017, Paris, France, 3–6 September 2017)

► Show Figures

Figure 1

4 pages, 346 KiB

Open AccessProceeding Paper

Label-Free Immunodetection in High Ionic Strength Solutions Using Carbon Nanotube Transistors with Nanobody Receptors

by Marcin S. Filipiak, Marcel Rother, Nesha M. Andoy, Arne C. Knudsen, Stefan B. Grimm, Christopher Bachran, Lee Kim Swee, Jana Zaumseil and Alexey Tarasov

Proceedings 2017, 1(4), 491; https://doi.org/10.3390/proceedings1040491 - 25 Aug 2017

Cited by 4 | Viewed by 2708

Abstract

Nanomaterial-based field-effect transistors (FETs) have been proposed for real-time, label-free detection of various biological species. However, screening of the analyte charge by electrolyte ions (Debye screening) has so far limited their use in physiological samples. Here, this challenge is overcome by combining FETs [...] Read more.

Nanomaterial-based field-effect transistors (FETs) have been proposed for real-time, label-free detection of various biological species. However, screening of the analyte charge by electrolyte ions (Debye screening) has so far limited their use in physiological samples. Here, this challenge is overcome by combining FETs based on single-walled semiconducting carbon nanotube networks (SWCNTs) with a novel surface functionalization comprising: (1) short nanobody receptors, and (2) a polyethylene glycol layer (PEG). Nanobodies are stable, easy-to-produce, short biological receptors (~2–4 nm) that enable analyte binding closer to the sensor surface. The addition of PEG enhances the signal in high ionic strength environment. Using green fluorescent protein (GFP) as a model antigen, high selectivity and sub-picomolar detection limit with a dynamic range exceeding 4 orders of magnitude is demonstrated in physiological solutions. The presented immunoassay is fast, label-free, does not require any sample pre-treatment or washing steps. Full article

(This article belongs to the Proceedings of Proceedings of Eurosensors 2017, Paris, France, 3–6 September 2017)

► Show Figures

Figure 1

4 pages, 1185 KiB

Open AccessProceeding Paper

Highly Stable PEDOT:PSS Coating on Gold Microelectrodes with Improved Charge Injection Capacity for Chronic Neural Stimulation

by Anmona S. Pranti, Andreas Schander, André Bödecker and Walter Lang

Proceedings 2017, 1(4), 492; https://doi.org/10.3390/proceedings1040492 - 25 Aug 2017

Cited by 18 | Viewed by 4644

Abstract

This study introduces two new processes that highly enable PEDOT:PSS (poly(3,4-ethylenedioxythiophene)-poly(styrenesulfonate)) as stable coating material for chronic neural stimulation. In first process, strong mechanical bonding between PEDOT:PSS coating and gold electrodes is achieved by creating rough porous surface with partial iodine etching. PEDOT:PSS [...] Read more.

This study introduces two new processes that highly enable PEDOT:PSS (poly(3,4-ethylenedioxythiophene)-poly(styrenesulfonate)) as stable coating material for chronic neural stimulation. In first process, strong mechanical bonding between PEDOT:PSS coating and gold electrodes is achieved by creating rough porous surface with partial iodine etching. PEDOT:PSS coating on iodine etched gold electrode shows 100% stability under strong ultrasonic treatment. The second process represents electrochemical modification of PEDOT:PSS coating by cyclic voltammetry method in Ringer’s solution. This process reduces electrode polarization 33% during stimulation. Therefore, charge injection capacity increases that ensures safe stimulation. A combination of both processes facilitates the use of PEDOT:PSS coating for successful chronic neural recording and stimulation. Full article

(This article belongs to the Proceedings of Proceedings of Eurosensors 2017, Paris, France, 3–6 September 2017)

► Show Figures

Figure 1

5 pages, 800 KiB

Open AccessProceeding Paper

A Reversible Method to Characterize the Mass Sensitivity of a 3-Dof Mode Localized Coupled Resonator under Atmospheric Pressure

by Yuan Wang, Chun Zhao, Chen Wang, Delphine Cerica, Mathieu Baijot, Vinayak Pachkawade, Ali Ghorbani, Maxime Boutier, Alain Vanderplasschen and Michael Kraft

Proceedings 2017, 1(4), 493; https://doi.org/10.3390/proceedings1040493 - 11 Aug 2017

Cited by 3 | Viewed by 2399

Abstract

In this paper, for the first time, the mass sensitivity of a 3-DoF mode localized electrostatic coupled resonator was characterized under atmospheric pressure. A reversible method was used in which nanoparticles are added on and removed from one resonator of the 3-DOF coupled [...] Read more.

In this paper, for the first time, the mass sensitivity of a 3-DoF mode localized electrostatic coupled resonator was characterized under atmospheric pressure. A reversible method was used in which nanoparticles are added on and removed from one resonator of the 3-DOF coupled resonator system. Besides, a comparison of three mass sensitivity characterization methods was carried out: resonance frequency shift, amplitude change and resonance vibration amplitude ratio. The results show that a 3-DOF mode localized coupled resonator has potential to be employed for biosensing applications. Full article

(This article belongs to the Proceedings of Proceedings of Eurosensors 2017, Paris, France, 3–6 September 2017)

► Show Figures

Figure 1

4 pages, 570 KiB

Open AccessProceeding Paper

Multimodal Neuroimaging Microtool for Infrared Optical Stimulation, Thermal Measurements and Recording of Neuronal Activity in the Deep Tissue

by Ágoston C. Horváth, Örs Sepsi, Csanád Ö. Boros, Szabolcs Beleznai, Pál Koppa and Zoltán Fekete

Proceedings 2017, 1(4), 494; https://doi.org/10.3390/proceedings1040494 - 25 Aug 2017

Viewed by 1939

Abstract

Infrared neural stimulation (INS) uses pulsed near-infrared light to generate highly controlled temperature transients in neurons, leading them to fire action potentials. Stimulation of the superficial layer of the intact brain has been presented, however, the stimulation of the deep neural tissue has [...] Read more.

Infrared neural stimulation (INS) uses pulsed near-infrared light to generate highly controlled temperature transients in neurons, leading them to fire action potentials. Stimulation of the superficial layer of the intact brain has been presented, however, the stimulation of the deep neural tissue has larger potential in view of therapeutic use. To reveal the underlying mechanism of deep tissue stimulation properly, we present the design, the fabrication scheme and functional testing of a novel, multimodal microelectrode for future INS experiments. Three modalities—electrophysiological recording, thermal measurements and infrared waveguiding abil—were integrated based on silicon MEMS technology. Due to the advanced functionalities, a single probe is sufficient to determine safe stimulation parameters in vivo. As far as we know, this is the first multimodal microelectrode designed for INS studies in deep neural tissue. In this paper, the technology and results of chip-scale measurements are presented. Full article

(This article belongs to the Proceedings of Proceedings of Eurosensors 2017, Paris, France, 3–6 September 2017)

► Show Figures

Figure 1

4 pages, 595 KiB

Open AccessProceeding Paper

Fabricating a Highly Sensitive QCM Sensor Using AAO Nanoholes and Its Application for Biosensing

by Naoto Asai, Tomohiro Shimizu, Shoso Shingubara and Takeshi Ito

Proceedings 2017, 1(4), 495; https://doi.org/10.3390/proceedings1040495 - 9 Aug 2017

Viewed by 1779

Abstract

A nanostructure composed of Anodic Aluminum Oxide (AAO) was obtained on an electrode of a quartz crystal microbalance (QCM) chip by anodizing Al thin film in an oxalic acid solution. The effective surface area was expanded by these nanostructures. Several morphologies were observed [...] Read more.

A nanostructure composed of Anodic Aluminum Oxide (AAO) was obtained on an electrode of a quartz crystal microbalance (QCM) chip by anodizing Al thin film in an oxalic acid solution. The effective surface area was expanded by these nanostructures. Several morphologies were observed under various anodic conditions by using scanning electron microscopy (SEM). We demonstrated that a QCM chip with the AAO was effective in biosensing because of its large surface area. The frequency shift corresponding to an antigen-antibody reaction improved on the nanostructured electrode compared with a flat surface electrode. Full article

(This article belongs to the Proceedings of Proceedings of Eurosensors 2017, Paris, France, 3–6 September 2017)

► Show Figures

Figure 1

4 pages, 1358 KiB

Open AccessProceeding Paper

Silicon Nanowires Based Resistors for Bacteria Detection

by Brice Le Borgne, Anne Claire Salaun, Laurent Pichon, Anne Jolivet-Gougeon, Sophie Martin, Regis Rogel and Olivier de Sagazan

Proceedings 2017, 1(4), 496; https://doi.org/10.3390/proceedings1040496 - 28 Aug 2017

Cited by 4 | Viewed by 2571

Abstract

Silicon nanowires (SiNWs) based resistors used as bacteria sensors are fabricated using the classical silicon technologies. SiNWs are grown by vapor liquid solid (VLS) method using gold as catalyst. Electrodes of the device are made of heavily in-situ doped polycristalline silicon. Results show [...] Read more.

Silicon nanowires (SiNWs) based resistors used as bacteria sensors are fabricated using the classical silicon technologies. SiNWs are grown by vapor liquid solid (VLS) method using gold as catalyst. Electrodes of the device are made of heavily in-situ doped polycristalline silicon. Results show potential use of the corresponding resistors, with SiNWs as sensitive units, for bacteria detection. Bacteria are preferentially hanged into SiNWs array and electrical resistance of the device decreases due to the presence of bacteria. Such resistors are promising bacteria sensors to monitor contamination in controlled environment for hygiene, fabricated in a simple and low-cost fabrication technology. Full article

(This article belongs to the Proceedings of Proceedings of Eurosensors 2017, Paris, France, 3–6 September 2017)

► Show Figures

Figure 1

5 pages, 1087 KiB

Open AccessProceeding Paper

A Tubing-Free, Microfluidic Platform for the Realization of Physiologically Relevant Dosing Curves on Cellular Models

by Christian Lohasz, Olivier Frey, Kasper Renggli and Andreas Hierlemann

Proceedings 2017, 1(4), 497; https://doi.org/10.3390/proceedings1040497 - 5 Sep 2017

Cited by 2 | Viewed by 2478

Abstract

We present a microfluidic tilting platform with gravity-driven flow that enables culturing of three-dimensional microtissues under in vivo-like drug dosing regimens. In contrast to traditional, constant dosing regimens, the chip allows for gradual changes in substance concentrations. Dosing gradients are generated through an [...] Read more.

We present a microfluidic tilting platform with gravity-driven flow that enables culturing of three-dimensional microtissues under in vivo-like drug dosing regimens. In contrast to traditional, constant dosing regimens, the chip allows for gradual changes in substance concentrations. Dosing gradients are generated through an asymmetric Y-junction of microfluidic channels of different widths. Changes in the chip operation parameters, e.g., different tilting angles, enable to alter the drug dosage on demand. The concentration changes over time matched the predicted values, and preformed microtissues could be cultured in the chip system for at least 24 h. The chip represents an easy-to-handle tool for toxicity and efficacy testing of transient drug concentrations changes. Full article

(This article belongs to the Proceedings of Proceedings of Eurosensors 2017, Paris, France, 3–6 September 2017)

► Show Figures

Figure 1

5 pages, 1193 KiB

Open AccessProceeding Paper

Flow-Ratio Monitoring in a Microchannel by Liquid-Liquid Interface Interferometry

by Martin Oellers, Frank Bunge, Poornanchandra Vinayaka, Sander van den Driesche and Michael J. Vellekoop

Proceedings 2017, 1(4), 498; https://doi.org/10.3390/proceedings1040498 - 30 Aug 2017

Cited by 1 | Viewed by 1999

Abstract

A new method to monitor the relative flow rates of two different liquids in a microchannel is presented. By using a simple out-of-plane interferometer setup, shifts in the position of the interface between the two liquids can be determined. This label-free and real-time [...] Read more.

A new method to monitor the relative flow rates of two different liquids in a microchannel is presented. By using a simple out-of-plane interferometer setup, shifts in the position of the interface between the two liquids can be determined. This label-free and real-time approach to observe the interface position yields the ratio of the flow rates. Applying an out-of-plane geometry allows the use of a flexible setup of chip-external optical components such as a laser and an image sensor, which is an advantage over fixed in-plane optics. With this measurement method we are able to monitor a change of about 1% of the relative flow rate between two fluidic inlets. Full article

(This article belongs to the Proceedings of Proceedings of Eurosensors 2017, Paris, France, 3–6 September 2017)

► Show Figures

Figure 1

4 pages, 1590 KiB

Open AccessProceeding Paper

Pericellular Oxygen Monitoring during Low-Level Light Therapy in Cell Culture Using a Microsensor System

by Julia Marzioch, Friederike Kramer, Peter Dungel, Jochen Kieninger and Gerald A. Urban

Proceedings 2017, 1(4), 499; https://doi.org/10.3390/proceedings1040499 - 21 Aug 2017

Viewed by 2131

Abstract

An electrochemical microsensor system to monitor the pericellular oxygen concentration of fibroblasts during low-level light therapy in vitro was developed. The system provides in-sight into the metabolism of the cells during and in consequence of illumination with visible red light. This approach is [...] Read more.

An electrochemical microsensor system to monitor the pericellular oxygen concentration of fibroblasts during low-level light therapy in vitro was developed. The system provides in-sight into the metabolism of the cells during and in consequence of illumination with visible red light. This approach is a unique method for real-time investigations of cellular respiration during light therapy. The presented sensor system features direct amperometric measurements by using chronoamperometric protocols for long-term stability. The oxygen measurements do not show a disturbance by light. Full article

(This article belongs to the Proceedings of Proceedings of Eurosensors 2017, Paris, France, 3–6 September 2017)

► Show Figures

Figure 1

5 pages, 517 KiB

Open AccessProceeding Paper

Electrochemiluminscence Based Biosensors with AuNP Showing Catalytic ROS Generation

by Yui Higashi, Joyotu Mazumder, Hiroyuki Yoshikawa, Masato Saito and Eiti Tamiya

Proceedings 2017, 1(4), 500; https://doi.org/10.3390/proceedings1040500 - 28 Aug 2017

Viewed by 1789

Abstract

Electrochemiluminescence (ECL) has been a useful analytical tool for fields such as molecular biology, food analysis, and analytical chemistry. In situ generation of reactive oxygen species (ROS) by surface mediated catalysis works collaboratively with the luminol based ECL system. This work describes an [...] Read more.

Electrochemiluminescence (ECL) has been a useful analytical tool for fields such as molecular biology, food analysis, and analytical chemistry. In situ generation of reactive oxygen species (ROS) by surface mediated catalysis works collaboratively with the luminol based ECL system. This work describes an ECL strategy involving in situ ROS generation from the surface of gold nanoparticles (AuNP). We reported on a novel condition to induce AuNP catalysis, and examined the application of this phenomenon to an immunosensing platform based on AuNP catalysis and ECL. Full article

(This article belongs to the Proceedings of Proceedings of Eurosensors 2017, Paris, France, 3–6 September 2017)

► Show Figures

Figure 1

5 pages, 676 KiB

Open AccessProceeding Paper

Stretchable Material for Microfluidic Applications

by Yves Fouillet, Charlotte Parent, Giacomo Gropplero, Laurent Davoust, Jean Luc Achard, Frédéric Revol-Cavalier and Nicolas Verplanck

Proceedings 2017, 1(4), 501; https://doi.org/10.3390/proceedings1040501 - 18 Aug 2017

Cited by 12 | Viewed by 3108

Abstract

Materials selected for microfluidic technology exhibit mechanical properties that can be a source of innovation. For instance, devices that take advantage of rigid (glass, silicon) or soft (elastomer, PDMS) materials, as well as porous materials, such as paper, are widely reported in the [...] Read more.

Materials selected for microfluidic technology exhibit mechanical properties that can be a source of innovation. For instance, devices that take advantage of rigid (glass, silicon) or soft (elastomer, PDMS) materials, as well as porous materials, such as paper, are widely reported in the literature. In this paper, we illustrate the potentialities of hyper elastic materials for lab-on-chip developments. Two breakthrough examples are reported: (i) a new digital microfluidics approach based on a stretchable membrane for addressing a large range of liquid volumes in complex protocols and (ii) a new low-cost approach for prototyping fully deformable microfluidic devices based on a polymeric foam. Full article

(This article belongs to the Proceedings of Proceedings of Eurosensors 2017, Paris, France, 3–6 September 2017)

► Show Figures

Figure 1

4 pages, 605 KiB

Open AccessProceeding Paper

Multiphysics Probe for Deep Brain Monitoring of Glioblastoma Environment

by Charles Chatard, Olivier Pascual, Yves Jourlin, Stéphane Marinesco, Daniel Barbier and Andrei Sabac

Proceedings 2017, 1(4), 502; https://doi.org/10.3390/proceedings1040502 - 17 Aug 2017

Viewed by 2091

Abstract

This work reports on the development, and preliminary results of a multiphysics probe for deep brain monitoring of neurotransmitters and metabolites in the glioblastoma environment. We made the proof of the concept of our probe with common mice glioblastoma cells GL261 modified with [...] Read more.

This work reports on the development, and preliminary results of a multiphysics probe for deep brain monitoring of neurotransmitters and metabolites in the glioblastoma environment. We made the proof of the concept of our probe with common mice glioblastoma cells GL261 modified with Green Fluorescent Protein. A silicon probe with a platinum electrode at the tip was functionalized with an enzyme in order to detect, for example, Glucose, D-serine, Lactate or Glutamate. In addition, an optical fiber was inserted in a groove in the middle of the probe for light excitation and detection of glioblastoma cells by fluorescence. Full article

(This article belongs to the Proceedings of Proceedings of Eurosensors 2017, Paris, France, 3–6 September 2017)

► Show Figures

Figure 1

4 pages, 719 KiB

Open AccessProceeding Paper

Detection of Aβ(1-40) Protein in Human Serum as a Causative Agent of Alzheimer’s Disease by Strain Gauge Cantilever Biosensor Immobilizing Liposome Incorporating Cholesterol

by Tomoya Taniguchi, Yuki Murakami, Masayuki Sohgawa, Kaoru Yamashita and Minoru Noda

Proceedings 2017, 1(4), 503; https://doi.org/10.3390/proceedings1040503 - 7 Sep 2017

Viewed by 1975

Abstract

We have successfully measured amyloid beta (Aβ) (1-40) protein added in human serum by a NiCr strain gauge cantilever biosensor immobilized with liposomes incorporating cholesterol. Importantly, we investigated the effect of incorporation of cholesterol in the liposome in order to suppress the interaction [...] Read more.

We have successfully measured amyloid beta (Aβ) (1-40) protein added in human serum by a NiCr strain gauge cantilever biosensor immobilized with liposomes incorporating cholesterol. Importantly, we investigated the effect of incorporation of cholesterol in the liposome in order to suppress the interaction between the liposome and many different proteins included in human serum. It was revealed that incorporating cholesterol suppresses the interaction between the proteins other than Aβ in human serum and the liposome. Finally, we detected Aβ(1-40) in human serum with typical chronological behaviors due to Aβ aggregation and fibrillization. Furthermore, as a digital low-pass filtering procedure could reduce external noises, the cantilever sensor immobilized with liposome incorporating cholesterol can detect low-concentrated Aβ in human serum. Full article

(This article belongs to the Proceedings of Proceedings of Eurosensors 2017, Paris, France, 3–6 September 2017)

► Show Figures

Figure 1

4 pages, 618 KiB

Open AccessProceeding Paper

In Situ Generation of Substrate via Bi-Potential Screen-Printed Electrode for Determination of Antioxidant Using Electrochemiluminescence

by Murasaki Kasai, Yuki Inoue, Joyotu Mazumder, Hiroyuki Yoshikawa, Masato Saito and Eiichi Tamiya

Proceedings 2017, 1(4), 504; https://doi.org/10.3390/proceedings1040504 - 25 Aug 2017

Cited by 1 | Viewed by 1821

Abstract

Excess generation of reactive oxygen species (ROS) could trigger a number of human diseases. We focused that antioxidants in beverages suppress the effect of ROS. Electrochemiluminescence (ECL) was determined by newly designed bi-potential screen printed electrodes and electron multiplying charge coupled device (EM-CCD) [...] Read more.

Excess generation of reactive oxygen species (ROS) could trigger a number of human diseases. We focused that antioxidants in beverages suppress the effect of ROS. Electrochemiluminescence (ECL) was determined by newly designed bi-potential screen printed electrodes and electron multiplying charge coupled device (EM-CCD) camera. Luminol based ECL was quenched due to the consumption of ROS by the antioxidants. Rapid and sensitive detection of antioxidants such as ascorbic acid and chlorogenic acid were demonstrated in beverage samples.
Full article

(This article belongs to the Proceedings of Proceedings of Eurosensors 2017, Paris, France, 3–6 September 2017)

► Show Figures

Figure 1

4 pages, 739 KiB

Open AccessProceeding Paper

Field-Effect Biosensors Modified with Tobacco Mosaic Virus Nanotubes as Enzyme Nanocarrier

by Melanie Jablonski, Claudia Koch, Thomas S. Bronder, Arshak Poghossian, Christina Wege and Michael J. Schöning

Proceedings 2017, 1(4), 505; https://doi.org/10.3390/proceedings1040505 - 8 Aug 2017

Cited by 3 | Viewed by 2908

Abstract

A new concept for the development of semiconductor field-effect biosensors by modification of a gate surface with tobacco mosaic virus (TMV) nanotubes, serving as enzyme nanocarrier, is presented. TMV nanotubes enable an immobilization of a high amount of enzymes without substantial loss of [...] Read more.

A new concept for the development of semiconductor field-effect biosensors by modification of a gate surface with tobacco mosaic virus (TMV) nanotubes, serving as enzyme nanocarrier, is presented. TMV nanotubes enable an immobilization of a high amount of enzymes without substantial loss of their activity, resulting in an enhanced biosensor performance. This approach has been experimentally demonstrated by realizing a capacitive field-effect penicillin biosensor using TMV nanotubes functionalized with the enzyme penicillinase as model system. Full article

(This article belongs to the Proceedings of Proceedings of Eurosensors 2017, Paris, France, 3–6 September 2017)

► Show Figures

Figure 1

3 pages, 385 KiB

Open AccessProceeding Paper

Detection of Adrenaline Based on Bioelectrocatalytical System to Support Tumor Diagnostic Technology

by Denise Molinnus, Gabriel Hardt, Larissa Käver, Holger S. Willenberg, Arshak Poghossian, Michael Keusgen and Michael J. Schöning

Proceedings 2017, 1(4), 506; https://doi.org/10.3390/proceedings1040506 - 7 Aug 2017

Cited by 3 | Viewed by 2314

Abstract

An amperometric biosensor based on the bioelectrocatalytic measurement principle for the detection of adrenaline has been developed. The adrenaline sensor has been prepared by modification of a platinum thin-film electrode with a pyrroloquinoline quinone-dependent glucose dehydrogenase. The enzyme was immobilized via cross-linking method. [...] Read more.

An amperometric biosensor based on the bioelectrocatalytic measurement principle for the detection of adrenaline has been developed. The adrenaline sensor has been prepared by modification of a platinum thin-film electrode with a pyrroloquinoline quinone-dependent glucose dehydrogenase. The enzyme was immobilized via cross-linking method. Lower detection limit of 1 nM of adrenaline has been achieved by measuring at physiological level at pH 7.4. Full article

(This article belongs to the Proceedings of Proceedings of Eurosensors 2017, Paris, France, 3–6 September 2017)

► Show Figures

Figure 1

4 pages, 514 KiB

Open AccessProceeding Paper

Optical Feedback Interferometry Flowmetry Sensor in Microfluidics Chip

by Yu Zhao, Julien Perchoux, Thierry Camps and Véronique Bardinal

Proceedings 2017, 1(4), 507; https://doi.org/10.3390/proceedings1040507 - 18 Aug 2017

Cited by 2 | Viewed by 1928

Abstract

Optical feedback interferometry (OFI) applied to microscale flow sensing is studied theoretically and experimentally. A new model is investigated that predicts the OFI signal. This model is based on the Lang-Kobayashi equations and highlights the importance of the laser beam propagation and the [...] Read more.

Optical feedback interferometry (OFI) applied to microscale flow sensing is studied theoretically and experimentally. A new model is investigated that predicts the OFI signal. This model is based on the Lang-Kobayashi equations and highlights the importance of the laser beam propagation and the laser-particle scattering performances. For the first time, the angle distribution of the scattered light is involved in the model. The model evaluates the impact on the OFI signal of the light propagation in the micro-scale channel geometry. The flow rate measurement shows good agreement with the model. Full article

(This article belongs to the Proceedings of Proceedings of Eurosensors 2017, Paris, France, 3–6 September 2017)

► Show Figures

Figure 1

4 pages, 722 KiB

Open AccessProceeding Paper

Vertical 3D GaN Nanoarchitectures towards an Integrated Optoelectronic Biosensing Platform in Microbial Fuel Cells

by Heidi Boht, Hilke Wichmann, Gregor Scholz, Feng Yu, Klaas Strempel, Shinta Mariana, Muhammad Fahlesa Fatahilah, Irene Manglano Clavero, Joan Daniel Prades, Uwe Schröder, Hutomo Suryo Wasisto and Andreas Waag

Proceedings 2017, 1(4), 508; https://doi.org/10.3390/proceedings1040508 - 4 Aug 2017

Cited by 1 | Viewed by 2133

Abstract

An integrated nano-optoelectronic biological sensor system is developed to obtain insights of the biochemical and physical processes of Geobacter sulfurreducens-based biofilm growth inside a miniaturized microbial fuel cell (MFC) reactor. Gallium nitride (GaN), which was used as a novel electrode material, has [...] Read more.

An integrated nano-optoelectronic biological sensor system is developed to obtain insights of the biochemical and physical processes of Geobacter sulfurreducens-based biofilm growth inside a miniaturized microbial fuel cell (MFC) reactor. Gallium nitride (GaN), which was used as a novel electrode material, has been investigated in terms of its biocompatibility and performance to transport the electrons delivered by the microorganisms. Moreover, in order to enhance the produced current density, vertical 3D GaN nanoarchitectures (i.e., arrays of nanowires and nanofins) with larger surface-to-volume ratios were fabricated using a top-down nanomachining method involving nanolithography and hybrid etching technique. Full article

(This article belongs to the Proceedings of Proceedings of Eurosensors 2017, Paris, France, 3–6 September 2017)

► Show Figures

Figure 1

4 pages, 676 KiB

Open AccessProceeding Paper

Real-Time QCM Measurements of Rolling Circle Amplification Products

by Narayanan Madaboosi, Felix Neumann, Iván Hernández-Neuta, Jeanpierre Salas, Vasile Mecea and Mats Nilsson

Proceedings 2017, 1(4), 509; https://doi.org/10.3390/proceedings1040509 - 9 Aug 2017

Cited by 1 | Viewed by 2152

Abstract

We demonstrate real-time experimental evidence for mass underestimation, to analyse high molecular weight biomolecules while using Quartz Crystal Microbalance (QCM) platform. For this, we present an experimental evidence with an assay consisting of an aptamer-antibody sandwich model with norovirus-like particles (NoVLPs). We combine [...] Read more.

We demonstrate real-time experimental evidence for mass underestimation, to analyse high molecular weight biomolecules while using Quartz Crystal Microbalance (QCM) platform. For this, we present an experimental evidence with an assay consisting of an aptamer-antibody sandwich model with norovirus-like particles (NoVLPs). We combine this with the proximity ligation assay to generate bulky rolling circle products on a gold spot centralized quartz resonator surface. Real-time monitoring of the assay build-up reflects that bulky NoVLPs and amplified oligonucleotides generate fluctuating signals during measurement using a microfluidic QCM sensor. Such an understanding of mass underestimation for heavier molecules becomes indispensable to get deeper insights into molecular interactions in biotechnology studied using QCM devices. Full article

(This article belongs to the Proceedings of Proceedings of Eurosensors 2017, Paris, France, 3–6 September 2017)

► Show Figures

Figure 1

4 pages, 442 KiB

Open AccessProceeding Paper

Sensor Array Based on Molecularly Imprinted Polymers for Simultaneous Detection of Lipoproteins

by Suticha Chunta, Sanita Singsanan, Roongnapa Suedee and Peter A. Lieberzeit

Proceedings 2017, 1(4), 510; https://doi.org/10.3390/proceedings1040510 - 8 Aug 2017

Cited by 1 | Viewed by 2359

Abstract

Herein we report a sensor array based on quartz crystal microbalance (QCM) to simultaneously detect two biomarkers, namely low-density lipoprotein (LDL), and high-density lipoprotein (HDL). Selective recognition takes place through molecularly imprinted polymers (MIP) with both MIPs and corresponding non-imprinted polymer (NIP) as [...] Read more.

Herein we report a sensor array based on quartz crystal microbalance (QCM) to simultaneously detect two biomarkers, namely low-density lipoprotein (LDL), and high-density lipoprotein (HDL). Selective recognition takes place through molecularly imprinted polymers (MIP) with both MIPs and corresponding non-imprinted polymer (NIP) as reference electrode. Sensor array performs highly appreciably in term of selectivity to LDL and HDL (defined through its cholesterol LDL-C, and HDL-C) when operated in 10 mM PBS. The sensor response time is less than 15 min. Furthermore, coefficients of variation indicating precision of our sensor array are at 2%–8%. Full article

(This article belongs to the Proceedings of Proceedings of Eurosensors 2017, Paris, France, 3–6 September 2017)

► Show Figures

Figure 1

5 pages, 1335 KiB

Open AccessProceeding Paper

Demonstration of Intracortical Chronic Recording and Acute Microstimulation Using Novel Floating Neural Probes

by Andreas Schander, Heiko Stemmann, Andreas K. Kreiter and Walter Lang

Proceedings 2017, 1(4), 511; https://doi.org/10.3390/proceedings1040511 - 16 Aug 2017

Cited by 7 | Viewed by 3126

Abstract

This paper presents long-term stable multichannel recording of neural activity using novel intracortical floating probes implanted chronically in rat cortex. The novel flexible probe design approach allows recording of action potentials for at least 38 days after implantation. Furthermore the capability of the [...] Read more.

This paper presents long-term stable multichannel recording of neural activity using novel intracortical floating probes implanted chronically in rat cortex. The novel flexible probe design approach allows recording of action potentials for at least 38 days after implantation. Furthermore the capability of the PEDOT: PSS coated microelectrodes for electrical stimulation is characterized in vitro and in an acute in vivo experiment. The in vitro results show a charge injection capacity of 2 mC/cm² and the in vivo results demonstrate reproducible response of the neural network to charge injection up to 1 mC/cm². The optical inspection of the explanted neural probe reveals sufficient stability of the PEDOT: PSS microelectrode coating for the acute microstimulation experiment. These preliminary results indicate the capability for long-term stable microstimulation. Full article

(This article belongs to the Proceedings of Proceedings of Eurosensors 2017, Paris, France, 3–6 September 2017)

► Show Figures

Figure 1

4 pages, 626 KiB

Open AccessProceeding Paper

Impact of Channel Geometry on the Discrimination of Mechanically Impaired Red Blood Cells in Passive Microfluidics

by Amin Amirouche, Rosaria Ferrigno and Magalie Faivre

Proceedings 2017, 1(4), 512; https://doi.org/10.3390/proceedings1040512 - 8 Aug 2017

Cited by 4 | Viewed by 1953

Abstract

In this work, we aimed at the discrimination of mechanically impaired red blood cells (RBCs) using passive microfluidic approaches. We investigated the impact of the channel geometry on the behavior of healthy RBCs (hRBCs) and thermally rigidified RBCs (T-rRBCs) flowing in (i) a [...] Read more.

In this work, we aimed at the discrimination of mechanically impaired red blood cells (RBCs) using passive microfluidic approaches. We investigated the impact of the channel geometry on the behavior of healthy RBCs (hRBCs) and thermally rigidified RBCs (T-rRBCs) flowing in (i) a Unique and Long Constriction (ULC) and (ii) a series of Oscillating Width Constrictions (OWC). To confront the two geometries, we evaluated potential biomarkers for cell discrimination such as their speed V, deformation index D and relaxation time τ. Full article

(This article belongs to the Proceedings of Proceedings of Eurosensors 2017, Paris, France, 3–6 September 2017)

► Show Figures

Figure 1

5 pages, 642 KiB

Open AccessProceeding Paper

Integrated System Based on Thin Film Technologies for Cell-Based Bioluminescence Assays

by Domenico Caputo, Giulia Petrucci, Valeria Di Fiore, Alessio Buzzin, Marco Nardecchia, Luca Cevenini, Elisa Michelini, Mara Mirasoli, Aldo Roda, Nicola Lovecchio, Francesca Costantini, Augusto Nascetti and Giampiero de Cesare

Proceedings 2017, 1(4), 513; https://doi.org/10.3390/proceedings1040513 - 16 Aug 2017

Viewed by 2163

Abstract

This work presents a miniaturized lab-on-chip system suitable for monitoring the activity of living cells through the on-chip detection of their bioluminescence emission. The system integrates amorphous silicon diodes, acting as temperature and light sensors, and indium tin oxide film, acting as heater, [...] Read more.

This work presents a miniaturized lab-on-chip system suitable for monitoring the activity of living cells through the on-chip detection of their bioluminescence emission. The system integrates amorphous silicon diodes, acting as temperature and light sensors, and indium tin oxide film, acting as heater, on a single glass substrate. During its operation, the glass is thermally and optically coupled to the investigated cells and electrically connected to an electronic board, which controls the lab-on-chip temperature and monitors the sensor photocurrents. The proposed lab-on-chip is particularly attractive for the development of portable cell-based biosensors useful for biological activity monitoring as well as for cell cytotoxicity evaluation. Full article

(This article belongs to the Proceedings of Proceedings of Eurosensors 2017, Paris, France, 3–6 September 2017)

► Show Figures

Figure 1

4 pages, 439 KiB

Open AccessProceeding Paper

Development of a Novel Platelets Functional Assay Using QCM

by Agnieszka E. Strallhofer, Stefan Jung, Christof Jungbauer and Peter A. Lieberzeit

Proceedings 2017, 1(4), 514; https://doi.org/10.3390/proceedings1040514 - 29 Aug 2017

Viewed by 1946

Abstract

Thrombocytes and their metabolites are involved in numerous physiological and pathophysiological processes, such as blood coagulation at the site of ruptured endothelium. Normal platelet aggregation can be suppressed via platelet antagonists or non-steroidal anti-inflammatory drugs (NSAIDs). That’s why differentiating between resting (“normal”) and [...] Read more.

Thrombocytes and their metabolites are involved in numerous physiological and pathophysiological processes, such as blood coagulation at the site of ruptured endothelium. Normal platelet aggregation can be suppressed via platelet antagonists or non-steroidal anti-inflammatory drugs (NSAIDs). That’s why differentiating between resting (“normal”) and inhibited platelets in a quick and precise fashion could be of a great clinical significance. Herein, we present the first step on the way to a novel platelet functionality assay based on Molecularly Imprinted Polymers (MIP) coated onto Quartz Crystal Microbalance (QCM). First results reveal sensor responses that depend on platelet concentration and on incubation of platelets with aspirin: acetyl salicylic acid (AAS). Full article

(This article belongs to the Proceedings of Proceedings of Eurosensors 2017, Paris, France, 3–6 September 2017)

► Show Figures

Figure 1

4 pages, 1082 KiB

Open AccessProceeding Paper

Real-Time Monitoring of Stem Cells by Diamond-Based Impedance Sensors

by Václav Procházka, Roman Matějka, Tibor Ižák, Ondrej Szabó, Jana Štěpanovská, Lucie Bačáková and Alexander Kromka

Proceedings 2017, 1(4), 515; https://doi.org/10.3390/proceedings1040515 - 23 Aug 2017

Viewed by 1899

Abstract

Cell-based impedance spectroscopy is a promising label-free method for electrical monitoring of cell activity. Here we present a diamond-based impedance sensor with built-in gold interdigitated electrodes (IDEs) as a promising platform for simultaneous electrical and optical monitoring of adipose-derived stem cells (ASC). The [...] Read more.

Cell-based impedance spectroscopy is a promising label-free method for electrical monitoring of cell activity. Here we present a diamond-based impedance sensor with built-in gold interdigitated electrodes (IDEs) as a promising platform for simultaneous electrical and optical monitoring of adipose-derived stem cells (ASC). The impedance spectra were collected in a wide frequency range (from 100 Hz to 50 kHz) for 27 h of cultivation in chambers designed for static cultivation. Absolute impedance spectra were analyzed in terms of measurement frequencies and cell properties monitored by high-resolution digital camera. Full article

(This article belongs to the Proceedings of Proceedings of Eurosensors 2017, Paris, France, 3–6 September 2017)

► Show Figures

Figure 1

4 pages, 527 KiB

Open AccessProceeding Paper

Study on Cell-Capturing Microfluidic Device in High Flow Rates through Controlling Shape of Microstructures and Their Alignments

by Dae-Sik Lee, Jeong Won Park, Moon Youn Jung and Chunwha Ihm

Proceedings 2017, 1(4), 516; https://doi.org/10.3390/proceedings1040516 - 22 Aug 2017

Viewed by 1667

Abstract

A new cell-trapping method for single cell analysis devices at a very rapid flow rate, is designed, fabricated and characterized by controlling shapes of microstructures and their arrangements in array just simply and effectively within the microfluidic channels. We simulated using a commercialized [...] Read more.

A new cell-trapping method for single cell analysis devices at a very rapid flow rate, is designed, fabricated and characterized by controlling shapes of microstructures and their arrangements in array just simply and effectively within the microfluidic channels. We simulated using a commercialized computational fluidic dynamic simulator (CFD-ACE+) and demonstrated experimentally that the cell-capturing rate enhanced over three times and a high capturing efficiency of about 70% at a 300 µL/min at the cross-arranged left-turned isosceles trapezoid. The device is applicable for a tool in the field of characterization of rare cells, personal medicine, and prognostic of disease. Full article

(This article belongs to the Proceedings of Proceedings of Eurosensors 2017, Paris, France, 3–6 September 2017)

► Show Figures

Figure 1

4 pages, 1187 KiB

Open AccessProceeding Paper

Monitoring Biological Cell Flow within a Mimicking Capillary Device with Impedance Measurement

by Tieying Xu, Maria Lizarralde, Wassim El Nemer, Bruno Le Pioufle and Olivier Français

Proceedings 2017, 1(4), 517; https://doi.org/10.3390/proceedings1040517 - 17 Aug 2017

Cited by 3 | Viewed by 2540

Abstract

This paper presents a microfluidic system, characterizing the red blood cell (RBC) deformability through its transit time in a microchannel, which dimensions reproducing blood microcirculation capillary. Electrodes are integrated within the microchannel for electrical measurements. The transit time is measured with the electrical [...] Read more.

This paper presents a microfluidic system, characterizing the red blood cell (RBC) deformability through its transit time in a microchannel, which dimensions reproducing blood microcirculation capillary. Electrodes are integrated within the microchannel for electrical measurements. The transit time is measured with the electrical blockade produced when the RBC squeezes in the microchannel (d = 5 μm diameter, while the cell diameter is 8 μm). In order to determine most suitable electrical frequency range for the voltage applied to excitation electrodes, FEM numerical simulation of the bioimpedance is achieved and presented in this paper. We investigated the frequency response of the bioimpedance taking into account the electrode polarization, the dielectric properties of the medium, a single shell model for RBC and finally the RBC position within the microchannel. Full article

(This article belongs to the Proceedings of Proceedings of Eurosensors 2017, Paris, France, 3–6 September 2017)

► Show Figures

Figure 1

5 pages, 1615 KiB

Open AccessProceeding Paper

Differential Inductive Sensor for Continuous Non-Invasive Cell Growth Monitoring in Disposable Bioreactors

by Maria Allers, Tobias Reinecke, Tamanna Nagraik, Dörte Solle, Kai Bakes, Marc Berger, Thomas Scheper and Stefan Zimmermann

Proceedings 2017, 1(4), 518; https://doi.org/10.3390/proceedings1040518 - 17 Aug 2017

Cited by 3 | Viewed by 2333

Abstract

In this work, we present a low-cost sensor system for continuous non-invasive cell growth monitoring, especially for single use bioreactor (SUB) applications. The sensor system is based on a differential transformer. Using this differential setup, the influence of the primary magnetic flux is [...] Read more.

In this work, we present a low-cost sensor system for continuous non-invasive cell growth monitoring, especially for single use bioreactor (SUB) applications. The sensor system is based on a differential transformer. Using this differential setup, the influence of the primary magnetic flux is eliminated from the measuring signal, enabling highly sensitive non-invasive detection of permittivity changes in the culture medium. To evaluate the sensor, E. coli cultivations are performed and the cell density is measured through the polymer foil of a SUB. We found a linear dependency with low data scattering between measuring signal and cell density. Full article

(This article belongs to the Proceedings of Proceedings of Eurosensors 2017, Paris, France, 3–6 September 2017)

► Show Figures

Figure 1

5 pages, 1005 KiB

Open AccessProceeding Paper

Bacillus spp. Cells Captured Selectively by Phages and Identified by Surface Enhanced Raman Spectroscopy Technique

by Antonia Lai, Salvatore Almaviva, Valeria Spizzichino, Domenico Luciani, Antonio Palucci, Sandro Mengali, Christophe Marquette, Olivier Berthuy, Bartlomiej Jankiewicz and Luigi Pierno

Proceedings 2017, 1(4), 519; https://doi.org/10.3390/proceedings1040519 - 17 Aug 2017

Cited by 3 | Viewed by 2849

Abstract

Surface Enhanced Raman Spectroscopy (SERS), has been employed as a rapid and accurate tool for recognition and classification of different microorganisms. The vibrational spectrum intrinsically provides the fingerprint of the molecular structure of microorganisms, without sample preparation. The characterization of Bacillus spp., used [...] Read more.

Surface Enhanced Raman Spectroscopy (SERS), has been employed as a rapid and accurate tool for recognition and classification of different microorganisms. The vibrational spectrum intrinsically provides the fingerprint of the molecular structure of microorganisms, without sample preparation. The characterization of Bacillus spp., used as a simulants of the dangerous Bacillus anthracis by means of SERS technique has been carried out. The positive results on the use of the SERS substrate functionalized with phages specific for bacteria are showed. This work is a part of the RAMBO project (Rapid Air particle Monitoring against BiOlogical threats) funded by EDA (European Defense Agency) whose goal is the development of an advanced “detect to warn sensor” of cells and spores of dangerous bacteria, with high performance, good selectivity and reliability. Full article

(This article belongs to the Proceedings of Proceedings of Eurosensors 2017, Paris, France, 3–6 September 2017)

► Show Figures

Figure 1

4 pages, 717 KiB

Open AccessProceeding Paper

Configurable on-Chip Gel Electrophoresis in Inkjet 3D Printed Microfluidic Modules

by Rafał Walczak, Krzysztof Adamski and Wojciech Kubicki

Proceedings 2017, 1(4), 520; https://doi.org/10.3390/proceedings1040520 - 7 Aug 2017

Cited by 2 | Viewed by 2291

Abstract

Inkjet 3D printing is with success used for preparation microfluidics devices as a microfluidic chips for DNA separation. Utilized this technic help us to prepare a chip in shorter time and cheaper, but length of microchannel are limited by possibility of support material [...] Read more.

Inkjet 3D printing is with success used for preparation microfluidics devices as a microfluidic chips for DNA separation. Utilized this technic help us to prepare a chip in shorter time and cheaper, but length of microchannel are limited by possibility of support material removing. One of the Solution for solve this limitations is divide a microfluidics chips for modules and printing them separately. I this paper we present a modular configurable system for gel electrophoresis. Results of carrying methylene-blue from first module to second module are showed. New methodology for electrophoresis is show. Full article

(This article belongs to the Proceedings of Proceedings of Eurosensors 2017, Paris, France, 3–6 September 2017)

► Show Figures

Figure 1

4 pages, 535 KiB

Open AccessProceeding Paper

Highly Sensitive Electrochemical Glutamate Microsensors for Food Analysis

by Andreas Weltin, Jochen Kieninger and Gerald A. Urban

Proceedings 2017, 1(4), 521; https://doi.org/10.3390/proceedings1040521 - 11 Aug 2017

Cited by 6 | Viewed by 2194

Abstract

Electrochemical microsensors are ideal to measure substances with low concentration in complex environments. The primary excitatory neurotransmitter l-glutamate is present in many foods as a distinctive flavour (enhancer) with a wide concentration range. In comparison to other methods, electrochemical sensors allow the rapid, [...] Read more.

Electrochemical microsensors are ideal to measure substances with low concentration in complex environments. The primary excitatory neurotransmitter l-glutamate is present in many foods as a distinctive flavour (enhancer) with a wide concentration range. In comparison to other methods, electrochemical sensors allow the rapid, precise, cost-effective, online measurement without any sample treatment. We developed a disposable electrochemical microsensor platform with multiple integrated, highly sensitive (detection limit <150 nM) and selective enzyme-based glutamate biosensors. We showed both the precise determination of glutamate levels in processed foods with high glutamate content (15–40 mM), e.g., broth, and in foods with low natural concentrations such as different types of cow’s milk (~250 μM). Hereby, we successfully demonstrated the capabilities of electrochemical biosensors in food monitoring, analysis and quality control. Full article

(This article belongs to the Proceedings of Proceedings of Eurosensors 2017, Paris, France, 3–6 September 2017)

► Show Figures

Figure 1

4 pages, 597 KiB

Open AccessProceeding Paper

Online Monitoring the Water Contaminations with Optical Biosensor

by Hui Gao, Silvia Generelli and Friedrich Heitger

Proceedings 2017, 1(4), 522; https://doi.org/10.3390/proceedings1040522 - 8 Sep 2017

Cited by 2 | Viewed by 2256

Abstract

This work presents a demonstrator for online monitoring of pesticides or water contaminants which is robust, fast, specific and low cost. The system is designed for continuous monitoring in water matrices (source- and surface water, treated waste water), and is thus completed with [...] Read more.

This work presents a demonstrator for online monitoring of pesticides or water contaminants which is robust, fast, specific and low cost. The system is designed for continuous monitoring in water matrices (source- and surface water, treated waste water), and is thus completed with an automated fluidics. The main characteristics of the system are: (a) Detection based on competitive immunoassay; (b) Label-free sensing with possibility of following the binding kinetics of the contaminants; (c) Modular sensing surfaces characteristics; (d) In-assay calibration/normalization; (e) Re-generable biochip >80 times; (f) Detection limit of the analyte, the pesticide atrazine, 0.05 µg/L; (g) Computational Bioanalytics; (h) Compensation of the interfering effects. Full article

(This article belongs to the Proceedings of Proceedings of Eurosensors 2017, Paris, France, 3–6 September 2017)

► Show Figures

Figure 1

4 pages, 550 KiB

Open AccessProceeding Paper

Microwave Sensor within a Microfluidic Chip for Biological Applications

by Abdellatif El Fellahi, Thierry Bore, Lionel Rousseau, Bruno Le Pioufle and Olivier Français

Proceedings 2017, 1(4), 523; https://doi.org/10.3390/proceedings1040523 - 11 Aug 2017

Cited by 2 | Viewed by 2524

Abstract

A miniaturized sensor operating in Radio Frequency region (RF) is proposed to address the need in picoliter liquid characterization. The sensor is based on a coplanar waveguide (CPW) combined with a microfluidic channel dedicated to microliter liquid characterization with perspectives for biology and [...] Read more.

A miniaturized sensor operating in Radio Frequency region (RF) is proposed to address the need in picoliter liquid characterization. The sensor is based on a coplanar waveguide (CPW) combined with a microfluidic channel dedicated to microliter liquid characterization with perspectives for biology and single cell characterization. Using microtechnology process, the sensor has been designed on a 0.5 mm thick quartz wafer with Cr/Au electrodes. A prototype of the sensor has been fabricated and evaluated with ethanol/water mixtures at different molar fractions of ethanol. A good agreement between theoretical and measured electrical response of the sensor is observed. Full article

(This article belongs to the Proceedings of Proceedings of Eurosensors 2017, Paris, France, 3–6 September 2017)

► Show Figures

Figure 1

4 pages, 940 KiB

Open AccessProceeding Paper

Light-Stimulated Hydrogels with Incorporated Graphene Oxide as Actuator Material for Flow Control in Microfluidic Applications

by Lars Breuer, Eric Guthmann, Michael J. Schöning, Ronald Thoelen and Torsten Wagner

Proceedings 2017, 1(4), 524; https://doi.org/10.3390/proceedings1040524 - 5 Sep 2017

Viewed by 2283

Abstract

Temperature-responsive Poly-N-isopropylacrylamide (PNIPAAm) hydrogels were modified with graphene oxide (GO) nanoparticles to increase the light absorption significantly and these gels can be heated and stimulated optothermically. These light-responsive hydrogels are promising candidates as actuator material for microfluidic applications. For demonstration, the [...] Read more.

Temperature-responsive Poly-N-isopropylacrylamide (PNIPAAm) hydrogels were modified with graphene oxide (GO) nanoparticles to increase the light absorption significantly and these gels can be heated and stimulated optothermically. These light-responsive hydrogels are promising candidates as actuator material for microfluidic applications. For demonstration, the hydrogels were tested as light-driven valves for the active flow control within microfluidic channels by monitoring the pressure and flow for different operation states. Full article

(This article belongs to the Proceedings of Proceedings of Eurosensors 2017, Paris, France, 3–6 September 2017)

► Show Figures

Figure 1

4 pages, 855 KiB

Open AccessProceeding Paper

Influence of Buffers and Culture Media on Diamond Solution-Gated Field Effect Transistors Regarding Stability and Memory Effect

by Václav Procházka, Tibor Ižák and Alexander Kromka

Proceedings 2017, 1(4), 525; https://doi.org/10.3390/proceedings1040525 - 25 Aug 2017

Viewed by 1920

Abstract

The transfer characteristics of a nanocrystalline diamond (NCD)-based solution-gated field effect transistor (SGFET) under the influence of inorganic and organic compounds were studied. Studied compounds included three different buffer solutions (Phosphate, HEPES, McIlvaine buffer) and commonly used culture media (fibronectin, albumin and fetal [...] Read more.

The transfer characteristics of a nanocrystalline diamond (NCD)-based solution-gated field effect transistor (SGFET) under the influence of inorganic and organic compounds were studied. Studied compounds included three different buffer solutions (Phosphate, HEPES, McIlvaine buffer) and commonly used culture media (fibronectin, albumin and fetal bovine serum). It was found that buffers with the same pH of 7.4 caused different voltage shifts in transfer characteristics. This effect was reversible which indicates the surface stability of the hydrogen-terminated diamond during repeated measurements. In contrast to this observation, the SGFET sensitivity decreased after applying the culture solutions which we attribute to the permanently adsorbed bio-layer formed on the SGFET channel sensing area. Full article

(This article belongs to the Proceedings of Proceedings of Eurosensors 2017, Paris, France, 3–6 September 2017)

► Show Figures

Figure 1

4 pages, 1917 KiB

Open AccessProceeding Paper

Modelling and Characterisation of Droplet Generation and Trapping in Cell Analytical Two-Phase Microfluidic System

by Anna B. Tóth, Eszter Holczer, Orsolya Hakkel, Eszter L. Tóth, Kristóf Iván and Péter Fürjes

Proceedings 2017, 1(4), 526; https://doi.org/10.3390/proceedings1040526 - 25 Aug 2017

Cited by 1 | Viewed by 2014

Abstract

Present study analyses the influence of flow characteristics of special water-oil two-phase microfluidic systems regarding the droplet generation, cell encapsulation and trapping processes. Water droplets were dispersed in oil continuous phase with the requirement of precise size distribution to enable effective cell entrapment. [...] Read more.

Present study analyses the influence of flow characteristics of special water-oil two-phase microfluidic systems regarding the droplet generation, cell encapsulation and trapping processes. Water droplets were dispersed in oil continuous phase with the requirement of precise size distribution to enable effective cell entrapment. The evolving droplet size and the number of encapsulated cells were examined considering the applied flow rate ratios of the two phases. The hydrodynamic behaviour of the microfluidic system was modelled by Finite Element Method (FEM) coupled with particle trajectory calculation applying COMSOL Multiphysics code. The experimental results were compared to the simulation and the applicability of our droplet based cell encapsulating and trapping microfluidic system was characterised. Full article

(This article belongs to the Proceedings of Proceedings of Eurosensors 2017, Paris, France, 3–6 September 2017)

► Show Figures

Figure 1

4 pages, 485 KiB

Open AccessProceeding Paper

A Miniaturized SPLITT System for On-Line Protein Separation

by Andrea Capuano, Andrea Adami, Viviana Mulloni and Leandro Lorenzelli

Proceedings 2017, 1(4), 527; https://doi.org/10.3390/proceedings1040527 - 25 Aug 2017

Viewed by 2139

Abstract

The development of a microfluidic module for on-line protein separation is presented in this paper. The device is based on the SPLITT (Split flow Thin fractionation) technique and the separation of proteins is electrically driven by means of two platinum electrodes included in [...] Read more.

The development of a microfluidic module for on-line protein separation is presented in this paper. The device is based on the SPLITT (Split flow Thin fractionation) technique and the separation of proteins is electrically driven by means of two platinum electrodes included in the structure of the microdevice. The microfluidic network is realized by means of a thin dry film structure, Ordyl SY 355, (thermo-compression lamination), laminated on three levels, which is patterned through a photolithographic technique. The device has been tested with a Bovine Serum Albumin (BSA) solution, through absorbance measurements with a spectrophotometer, with best achieved separation at the outlet of 40%, measured as relative concentration unbalance at output channels. Full article

(This article belongs to the Proceedings of Proceedings of Eurosensors 2017, Paris, France, 3–6 September 2017)

► Show Figures

Figure 1

4 pages, 492 KiB

Open AccessProceeding Paper

Novel Four Layer Metal Sensing in Portable SPR Sensor Platform for Viral Particles Quantification

by Briliant Adhi Prabowo, Azharul Alom, Parthasarathi Pal, Muhammad Khari Secario, Robert Y. L. Wang and Kou Chen Liu

Proceedings 2017, 1(4), 528; https://doi.org/10.3390/proceedings1040528 - 21 Aug 2017

Cited by 5 | Viewed by 2460

Abstract

Label-free, direct, rapid and real-time quantification method for human enterovirus 71 (EV71) using surface plasmon resonance (SPR) sensor is presented in this study. The performance of the four layer sensor chip was compared with the conventional Au monolayer sensor chip. Four layer sensor [...] Read more.

Label-free, direct, rapid and real-time quantification method for human enterovirus 71 (EV71) using surface plasmon resonance (SPR) sensor is presented in this study. The performance of the four layer sensor chip was compared with the conventional Au monolayer sensor chip. Four layer sensor chip gave optimum resonance wavelength around 610 nm, which was same with the OLED light source peak wavelength and gave better quality factor (Q = DIP/FWHM). The result showed that the structure with 3 nm Al, 10 nm Au, 20 nm Ag, 10 nm Au layer sensor chip gave better limit of detection than the 3 nm Cr, and 47 nm Au layer sensor chip. The detection limit of direct quantification of EV71 particles is improved to 43 vp/mL of EV71 in DMEM medium. The results proved that the SPR biosensor with four layer sensor chip structure demonstrated great performance in the quantification of EV71 virus species. Full article

(This article belongs to the Proceedings of Proceedings of Eurosensors 2017, Paris, France, 3–6 September 2017)

► Show Figures

Figure 1

5 pages, 961 KiB

Open AccessProceeding Paper

Magnetic Detection Structure for LOC Immunoassays, Multiphysics Simulations and Experimental Results

by Amine Rabehi, Benjamin Garlan, Faezeh Shanehsazzadeh, Hamid Kokabi, Kieu Ngo and Hans-Joachim Krause

Proceedings 2017, 1(4), 529; https://doi.org/10.3390/proceedings1040529 - 18 Aug 2017

Cited by 1 | Viewed by 2063

Abstract

The aim of this work is to develop a completely integrated Lab-On-Chip (LOC) for easy, rapid and cost-effective immunoassays. The pathogen sensing system is composed of a microfluidic channel surrounded by planar microcoils which are responsible for the emission and the detection of [...] Read more.

The aim of this work is to develop a completely integrated Lab-On-Chip (LOC) for easy, rapid and cost-effective immunoassays. The pathogen sensing system is composed of a microfluidic channel surrounded by planar microcoils which are responsible for the emission and the detection of magnetic fields. The system allows the detection and quantification of superparamagnetic beads used for immunoassays in a “sandwich” antigen-antibody configuration. Multiphysics simulations have been achieved and preliminary experimental results have allowed to validate the structure. Full article

(This article belongs to the Proceedings of Proceedings of Eurosensors 2017, Paris, France, 3–6 September 2017)

► Show Figures

Figure 1

4 pages, 1807 KiB

Open AccessProceeding Paper

Characterization of Retinal Pigmented Epithelium Cells Density on a MicroElectrode Array Using Impedance Spectroscopy

by Jocelyn Boutzen, Manon Valet, Valérie Fradot, Lionel Rousseau, Olivier Français, Serge Picaud and Gaëlle Lissorgues

Proceedings 2017, 1(4), 530; https://doi.org/10.3390/proceedings1040530 - 28 Aug 2017

Viewed by 2314

Abstract

This work is aiming at using impedance measurements on MicroElectrode Array (MEA) in order to evaluate the cellular density at its surface. As the context of these measurements is retinal implants, the retinal pigmented epithelium cells (RPE) are used as cellular model. We [...] Read more.

This work is aiming at using impedance measurements on MicroElectrode Array (MEA) in order to evaluate the cellular density at its surface. As the context of these measurements is retinal implants, the retinal pigmented epithelium cells (RPE) are used as cellular model. We measured the impedance changes at 4 different locations of the MEA during 13 days (approximately one measure every two days) and the cell density by manually counting them by microscope imaging taken just after the impedance measurement. A correlation between the cell density and the impedance measurement’s change can be observed. The electrode interfaces and the biological cells are associated with an electrical model taking into account the ionic conduction (resistance) and polarization effects (capacitance). Full article

(This article belongs to the Proceedings of Proceedings of Eurosensors 2017, Paris, France, 3–6 September 2017)

► Show Figures

Figure 1

4 pages, 873 KiB

Open AccessProceeding Paper

Laser-Machined Split-Ring Resonators Embedded in a Polymer Matrix for Glaucoma Monitoring

by Aybuke Calikoglu, Gunhan Dundar, Arda Deniz Yalcinkaya and Hamdi Torun

Proceedings 2017, 1(4), 531; https://doi.org/10.3390/proceedings1040531 - 17 Aug 2017

Viewed by 2088

Abstract

This paper presents a biosensor based on laser-machined metallic split-ring resonators embedded in hydrophilic polymer matrices for glaucoma monitoring. The inner and outer radii of the annular resonators are optimized using a finite-element model for the anterior part of the fibrous layer of [...] Read more.

This paper presents a biosensor based on laser-machined metallic split-ring resonators embedded in hydrophilic polymer matrices for glaucoma monitoring. The inner and outer radii of the annular resonators are optimized using a finite-element model for the anterior part of the fibrous layer of human eye. The split-ring resonators are designed to have resonant frequencies in S-band. The devices are fabricated by laser cutting of 15 μm-thick aluminum sheets. Split-ring resonators are then embedded into photo-polymerized cross-linked hydrogels, which are used to prepare hydrophilic polymer matrices. The change in the resonance characteristics of the device is obtained with respect to the change in the curvature. The sensitivity of the sensor is calculated as −24.12 MHz/mm per unit change in the radius of the curvature. Full article

(This article belongs to the Proceedings of Proceedings of Eurosensors 2017, Paris, France, 3–6 September 2017)

► Show Figures

Figure 1

4 pages, 534 KiB

Open AccessProceeding Paper

Comparison of ITO and IrO_x-Modified ITO Interdigitated Electrodes for Electrical Cell-Substrate Impedance Sensing (ECIS) Applications

by Jaime Martinez, Amalric Montalibet, Eric McAdams, Magalie Faivre and Rosaria Ferrigno

Proceedings 2017, 1(4), 532; https://doi.org/10.3390/proceedings1040532 - 9 Aug 2017

Cited by 4 | Viewed by 2298

Abstract

This study compares the sensitivity of interdigitated electrodes (IDEs) used in Electrical Cell-Substrate Impedance Sensing (ECIS). IDEs made of indium tin oxide (ITO) and ITO coated with iridium oxide (IrO_x) were used for ECIS measurements with the human breast cancer cell [...] Read more.

This study compares the sensitivity of interdigitated electrodes (IDEs) used in Electrical Cell-Substrate Impedance Sensing (ECIS). IDEs made of indium tin oxide (ITO) and ITO coated with iridium oxide (IrO_x) were used for ECIS measurements with the human breast cancer cell line, MCF-7. The results indicate that IrO_x-modified ITO electrodes provide both biocompatibility and higher cell sensitivity compared to ITO electrodes. We also found that the quantity of IrO_xrequired to generate such a sensitivity improvement is sufficiently low to not interfere with the visualization of the cells under study. IrO_x-modified ITO electrodes are therefore promising sensors for ECIS applications. Full article

(This article belongs to the Proceedings of Proceedings of Eurosensors 2017, Paris, France, 3–6 September 2017)

► Show Figures

Figure 1

4 pages, 589 KiB

Open AccessProceeding Paper

A Resazurin Based Bio Sensor for Detection of Organic Pollutants in Water

by Amani Migaou, Anne-Marie Gue, Marie-Charline Blatche, Daniel Esteve and Ali Boukabache

Proceedings 2017, 1(4), 533; https://doi.org/10.3390/proceedings1040533 - 21 Aug 2017

Viewed by 2060

Abstract

With the objective of water analysis, a microsystem was developed, by using Resazurin molecule as an indirect bio sensor. The detection principle consists to monitor optically the oxygen consumption of E. Coli bacteria towards their metabolism in presence of organic pollutants. Thus, aiming [...] Read more.

With the objective of water analysis, a microsystem was developed, by using Resazurin molecule as an indirect bio sensor. The detection principle consists to monitor optically the oxygen consumption of E. Coli bacteria towards their metabolism in presence of organic pollutants. Thus, aiming on Glucose detection, a concentration-dependent inhibition effect on oxygen consumption rate was evidenced in the [0–0.41 mM] range of organic pollutants. Full article

(This article belongs to the Proceedings of Proceedings of Eurosensors 2017, Paris, France, 3–6 September 2017)

► Show Figures

Figure 1

4 pages, 372 KiB

Open AccessProceeding Paper

Impedimetric IgG-Biosensor with In-Situ Generation of the Redox-Probe

by Julian D. Schrattenecker, Rudolf Heer, Rainer Hainberger and Günter Fafilek

Proceedings 2017, 1(4), 534; https://doi.org/10.3390/proceedings1040534 - 4 Aug 2017

Cited by 4 | Viewed by 2057

Abstract

For most electrochemical impedance spectroscopy measurements Ferro-/Ferricyanide is used as redox-probe, but it has limitations in its application for biosensors based on gold electrodes because of chemical degradation induced by the Ferro-/Ferricyanide. The in-situ reduction of [Ru(NH₃)₆]³⁺ to [...] Read more.

For most electrochemical impedance spectroscopy measurements Ferro-/Ferricyanide is used as redox-probe, but it has limitations in its application for biosensors based on gold electrodes because of chemical degradation induced by the Ferro-/Ferricyanide. The in-situ reduction of [Ru(NH₃)₆]³⁺ to [Ru(NH₃)₆]²⁺ by means of a direct current during EIS measurements is introduced to generate a stable redox-probe for biosensors. This method of enhanced EIS measurement has been applied to determine the charge transfer resistance of a human-IgG biosensor with a linear range from 0.9 to 50 mg/L IgG. Full article

(This article belongs to the Proceedings of Proceedings of Eurosensors 2017, Paris, France, 3–6 September 2017)

► Show Figures

Figure 1

4 pages, 1782 KiB

Open AccessProceeding Paper

In-Situ Electrophoretic Mobility Determination by Particle Image Velocimetry for Efficient Microfluidic Enrichment of Bacteria

by Richard Rietzel, Matthias Hügle, Gregory Dame, Ole Behrmann and Gerald A. Urban

Proceedings 2017, 1(4), 535; https://doi.org/10.3390/proceedings1040535 - 30 Aug 2017

Viewed by 2188

Abstract

We present a novel approach for the efficiency enhancement of microfluidic bacteria enrichment systems based on free-flow electrophoresis (FFE). FFE efficiency is highly dependent on the electrophoretic mobility μ of the bacteria. As μ varies strongly with the suspension medium, fast and accurate [...] Read more.

We present a novel approach for the efficiency enhancement of microfluidic bacteria enrichment systems based on free-flow electrophoresis (FFE). FFE efficiency is highly dependent on the electrophoretic mobility μ of the bacteria. As μ varies strongly with the suspension medium, fast and accurate determination of μ is needed to achieve optimal enrichment performance from different suspension media. For the first time, μ is determined in-situ for multiple media during on-chip FFE by Particle Image Velocimetry (PIV) of fluorescent bacteria, obviating the need for separate measurement equipment or chemical staining of the bacteria. Full article

(This article belongs to the Proceedings of Proceedings of Eurosensors 2017, Paris, France, 3–6 September 2017)

► Show Figures

Figure 1

5 pages, 459 KiB

Open AccessProceeding Paper

Leishmania spp. Detection Using a Surface Plasmon Resonance Biosensor

by Edlaine Ferreira, Jefferson Lima, Renata Pereira Alves-Balvedi, Paulo Rogério Bonan, Eliton Medeiros, Luiz Goulart, Antonio Lima, Helmut Neff, Leiva Oliveira, Lucio Castellano, Artur Araújo and Cleumar Moreira

Proceedings 2017, 1(4), 536; https://doi.org/10.3390/proceedings1040536 - 9 Aug 2017

Cited by 4 | Viewed by 2917

Abstract

The detection of Leishmania spp. through a disposable surface plasmon resonance (SPR) biochip, using mono- and polychromatic sources, is presented here. A highly specific and sensitive-constrained synthetic peptide (LC2) derived from a mimotope of Leishmania chagasi antigen was immobilized on the sensing region [...] Read more.

The detection of Leishmania spp. through a disposable surface plasmon resonance (SPR) biochip, using mono- and polychromatic sources, is presented here. A highly specific and sensitive-constrained synthetic peptide (LC2) derived from a mimotope of Leishmania chagasi antigen was immobilized on the sensing region using a simple protocol. ELISA- and PCR-confirmed negative and positive sera of Leishmania chagasi infected patients were used. Detection of positive IgG showed a fast response with good sensitivity and specificity for the proposed method. Full article

(This article belongs to the Proceedings of Proceedings of Eurosensors 2017, Paris, France, 3–6 September 2017)

► Show Figures

Figure 1

5 pages, 759 KiB

Open AccessProceeding Paper

Integration and Bio-Functionalization of Vertically Aligned Carbon Nanotube Forests on High Frequency AlN Gravimetric Sensors

by José Miguel Escolano, Bruno Marco, Teona Mirea, Jimena Olivares, Marta Clement, Diego Megias and Enrique Iborra

Proceedings 2017, 1(4), 537; https://doi.org/10.3390/proceedings1040537 - 7 Aug 2017

Viewed by 1835

Abstract

In this work, we grow different types of carbon nanotube (CNT) forests directly on AlN-based electroacoustic biosensors and study their functionalization efficiency. CNTs are used to increase the effective surface area of the sensor, pursuing a better sensitivity, without increasing the sensor capacitance. [...] Read more.

In this work, we grow different types of carbon nanotube (CNT) forests directly on AlN-based electroacoustic biosensors and study their functionalization efficiency. CNTs are used to increase the effective surface area of the sensor, pursuing a better sensitivity, without increasing the sensor capacitance. Here we use a general method for CNT bio-functionalization with specific receptors for targeted species. First, we make them hydrophilic. Next, we cover them with alternating polymers. Finally, we incubate their surface in an N-hydroxysuccinimide biotin solution. To study the functionalization homogeneity along the CNT length, Streptavidin conjugated with fluorescein isothiocyanate is used as the targeted species for confocal fluorescence microscopy characterization. Full article

(This article belongs to the Proceedings of Proceedings of Eurosensors 2017, Paris, France, 3–6 September 2017)

► Show Figures

Figure 1

4 pages, 569 KiB

Open AccessProceeding Paper

Cortisol Stress Biosensor Based on Molecular Imprinted Polymer

by Supannika Klangphukhiew, Roongnapa Srichana and Rina Patramanon

Proceedings 2017, 1(4), 538; https://doi.org/10.3390/proceedings1040538 - 16 Aug 2017

Cited by 10 | Viewed by 3395

Abstract

The molecular imprinted polymer (MIP) technique was applied to receptors that could imitate the performance of natural anti-cortisol antibody with high stability. Cortisol-molecular imprinted polymer (cortisol-MIP) was obtained using the multi-step swelling and polymerization protocol with cortisol as a target molecule. The suitable [...] Read more.

The molecular imprinted polymer (MIP) technique was applied to receptors that could imitate the performance of natural anti-cortisol antibody with high stability. Cortisol-molecular imprinted polymer (cortisol-MIP) was obtained using the multi-step swelling and polymerization protocol with cortisol as a target molecule. The suitable ratio of methacrylic acid:acrylamide :cortisol which allowed the formation of 642.3 ± 35.8 nm homogenous particles was 2:1:1. Cortisol-MIP was integrated to the sensor. It was coated on the disposable screen-printed carbon electrode (SPCE) for portable electrochemical analysis. The physical properties of Cortisol-MIP were characterized by means of electron microscope techniques. The binding characteristics were evaluated via covalent patterns changing in FTIR spectra which were related to voltammetry responses. The SPCE modified with cortisol-MIP was able to perform various detection ranges from 1.28 to 20 nM and the high selectivity compared to three other glucocorticoid analogs. Full article

(This article belongs to the Proceedings of Proceedings of Eurosensors 2017, Paris, France, 3–6 September 2017)

► Show Figures

Figure 1

4 pages, 731 KiB

Open AccessProceeding Paper

Integration of Graphene on AlN Based High Frequency Resonators and Their Functionalization for Biosensing

by Bruno Marco, Lorena Gordillo, José Miguel Escolano, Jimena Olivares, Marta Clement, Diego Mejias and Enrique Iborra

Proceedings 2017, 1(4), 539; https://doi.org/10.3390/proceedings1040539 - 7 Aug 2017

Viewed by 2089

Abstract

We present the successful integration of graphene on top of AlN-based solidly mounted resonators (SMRs), using a low temperature CVD process and Ni layers as catalyst. We develop a protocol to functionalize the surface of the resonators that starts with a low damage [...] Read more.

We present the successful integration of graphene on top of AlN-based solidly mounted resonators (SMRs), using a low temperature CVD process and Ni layers as catalyst. We develop a protocol to functionalize the surface of the resonators that starts with a low damage O₂ radical plasma treatment of the surface of the devices that introduces a controlled density of defects on the graphene. Then, EDC/NHS chemistry is used to covalently bond streptavidin molecules to the surface of the sensors. Finally, the functionalised biosensors are assessed by analysing their response to biotinylated antibodies. Full article

(This article belongs to the Proceedings of Proceedings of Eurosensors 2017, Paris, France, 3–6 September 2017)

► Show Figures

Figure 1

4 pages, 649 KiB

Open AccessProceeding Paper

Diamond Coated LW-SAW Sensors-Study of Diamond Thickness Effect

by L. Drbohlavová, J. C. Gerbedoen, A. Taylor, A. Talbi, L. Fekete, P. Ashcheulov, A. Soltani, V. Bovtun, M. Kempa, J. Bartoň, P. Cígler and V. Mortet

Proceedings 2017, 1(4), 540; https://doi.org/10.3390/proceedings1040540 - 9 Aug 2017

Viewed by 2059

Abstract

This study focuses on the fabrication and characterization of Love wave surface acoustic wave (LW-SAW) sensors with a thin nano-crystalline diamond (NCD) coating with an integrated microfluidics system. The effect of diamond layer thickness on the acoustic wave phase velocity and the sensor’s [...] Read more.

This study focuses on the fabrication and characterization of Love wave surface acoustic wave (LW-SAW) sensors with a thin nano-crystalline diamond (NCD) coating with an integrated microfluidics system. The effect of diamond layer thickness on the acoustic wave phase velocity and the sensor’s sensitivity have been investigated experimentally and compared with theoretical simulations. The fabricated sensors have been tested with a several liquids using a home-made microfluidics system. Full article

(This article belongs to the Proceedings of Proceedings of Eurosensors 2017, Paris, France, 3–6 September 2017)

► Show Figures

Figure 1

5 pages, 1308 KiB

Open AccessProceeding Paper

Biomolecular Detection Based on the Rotational Dynamics of Magneto-Plasmonic Nanoparticles

by Astrit Shoshi, Pia Schneeweiss, Michael J. Haslinger, Thomas Glatzl, Gábor Kovács, Judith Schinerl, Michael Muehlberger and Hubert Brueckl

Proceedings 2017, 1(4), 541; https://doi.org/10.3390/proceedings1040541 - 7 Aug 2017

Cited by 2 | Viewed by 2904

Abstract

We report on a nanoparticle-based biosensor that represents a label-free homogeneous bioassay suitable for in-vitro biomolecular diagnostics. The underlying detection principle is based on the optical observation of the rotational dynamics of multicomponent nanoparticles utilizing magnetic and plasmonic properties. The plasmon-optical properties of [...] Read more.

We report on a nanoparticle-based biosensor that represents a label-free homogeneous bioassay suitable for in-vitro biomolecular diagnostics. The underlying detection principle is based on the optical observation of the rotational dynamics of multicomponent nanoparticles utilizing magnetic and plasmonic properties. The plasmon-optical properties of the anisotropic nanoparticles depending on their material composition and geometrical design were investigated by numerical simulations. Based on such an analysis, monodisperse magneto-plasmonic nanoparticles were fabricated using physical fabrication methods. Rotational dynamics measurements revealed the lowest detectable particle concentration in the picomolar (ng/mL) regime, which is very promising in reaching the biomolecular limit of detection which is relevant for routine clinical diagnostics. Full article

(This article belongs to the Proceedings of Proceedings of Eurosensors 2017, Paris, France, 3–6 September 2017)

► Show Figures

Figure 1

4 pages, 1063 KiB

Open AccessProceeding Paper

Reference-Incorporating Microwave Resonator-Based Sensors for Biological Sensing Applications

by Berk Camli, Hamdi Torun, Gunhan Dundar and Arda D. Yalcinkaya

Proceedings 2017, 1(4), 542; https://doi.org/10.3390/proceedings1040542 - 7 Aug 2017

Cited by 3 | Viewed by 2308

Abstract

Use of microwave resonator-based sensors is a relatively new approach for the detection of biological reagents. Sensing mechanism is based on the tracking of the resonant frequency on electromagnetic resonator. Resonant frequency depends on structure geometry and material but is also affected by [...] Read more.

Use of microwave resonator-based sensors is a relatively new approach for the detection of biological reagents. Sensing mechanism is based on the tracking of the resonant frequency on electromagnetic resonator. Resonant frequency depends on structure geometry and material but is also affected by secondary changes in environment. Addition of a reference resonator to suppress these effects is proposed in this work. Identical sensor structures designed at 2 GHz, fabricated using low-cost processes are used in experiments to demonstrate the use of a resonator pair for sensing of glucose in solutions, yielding a sensitivity of 34.72 MHz/ (mg/mL). Full article

(This article belongs to the Proceedings of Proceedings of Eurosensors 2017, Paris, France, 3–6 September 2017)

► Show Figures

Figure 1

5 pages, 700 KiB

Open AccessProceeding Paper

Dielectric Characterisation of Single Microalgae Cell Using Electrorotation Measurements

by Yu-Sheng Lin, Sung Tsang, Rasta Ghasemi, Sakina Bensalem, Olivier Français, Filipa Lopes, Hsiang-Yu Wang, Chen-Li Sun and Bruno Le Pioufle

Proceedings 2017, 1(4), 543; https://doi.org/10.3390/proceedings1040543 - 7 Aug 2017

Cited by 2 | Viewed by 2716

Abstract

This study demonstrates the electrorotation of single microalgae cells captured in the center of a set of planar microelectrodes within a microfluidic device, and compares the rotational speeds of single microalgae cells obtained in experiments and theoretical calculations. Negative dielectrophoresis force and rotational [...] Read more.

This study demonstrates the electrorotation of single microalgae cells captured in the center of a set of planar microelectrodes within a microfluidic device, and compares the rotational speeds of single microalgae cells obtained in experiments and theoretical calculations. Negative dielectrophoresis force and rotational electric field are generated by the microelectrode set to position and rotate single microalgae cells. The rotational speed of single microalgae cells in the microfluidic device is calculated automatically using an image-processing algorithm. The electrorotation spectra of microalgae cells enduring different periods of nitrogen starvation agree with the simulation results for low- and high-lipid content cells. These results show the great potential of using electrorotation in quantifying the dielectric characteristics of microalgae cells. Full article

(This article belongs to the Proceedings of Proceedings of Eurosensors 2017, Paris, France, 3–6 September 2017)

► Show Figures

Figure 1

4 pages, 681 KiB

Open AccessProceeding Paper

Monitoring of Monosodium Urate Crystallization for the Detection of Crystal Arthropathies in Human Joints

by Thomas Voglhuber-Brunnmaier, Erwin K. Reichel, Johannes K. Sell and Bernhard Jakoby

Proceedings 2017, 1(4), 544; https://doi.org/10.3390/proceedings1040544 - 21 Aug 2017

Cited by 2 | Viewed by 2128

Abstract

A piezoelectric tuning fork sensor is evaluated as a physical excitation and sensing device aiming at the detection of crystals and their nucleation behavior in joint fluids, as observed in gout. This device allows to study the crystallization tendency at varying temperatures or [...] Read more.

A piezoelectric tuning fork sensor is evaluated as a physical excitation and sensing device aiming at the detection of crystals and their nucleation behavior in joint fluids, as observed in gout. This device allows to study the crystallization tendency at varying temperatures or at increased uric acid concentrations as predominant in real human joints. In this work, a tuning fork resonator is characterized to enable spatially resolved viscosity and density measurements by calculating the mode shape of the vibration from resonance frequency measurements when immersed in test liquids. Full article

(This article belongs to the Proceedings of Proceedings of Eurosensors 2017, Paris, France, 3–6 September 2017)

► Show Figures

Figure 1

4 pages, 548 KiB

Open AccessProceeding Paper

Acoustic Streaming Actuator and Multifrequency Resonator Sensor

by Erwin K. Reichel, Thomas Voglhuber-Brunnmaier and Bernhard Jakoby

Proceedings 2017, 1(4), 545; https://doi.org/10.3390/proceedings1040545 - 8 Aug 2017

Cited by 2 | Viewed by 1868

Abstract

We introduce an analysis platform for the viscoelastic properties of biological fluids such as the synovia found in articular joints. Small sample volumes are available for diagnostic purpose. Our approach uses a thickness shear mode quartz crystal integrated in an electrodynamically actuated spring [...] Read more.

We introduce an analysis platform for the viscoelastic properties of biological fluids such as the synovia found in articular joints. Small sample volumes are available for diagnostic purpose. Our approach uses a thickness shear mode quartz crystal integrated in an electrodynamically actuated spring structure. This combines the sensitivity of the quartz resonator operating at several overtones in the MHz range with previously introduced low kHz frequency multimode resonators. The latter is not only advantageous for characterizing viscoelastic fluids but is also used as an acoustic streaming actuator. Particulate matter in the sample thus can be resuspended and their settling is observed by tracking the resonance frequencies and Q-factors of both the quartz and electrodynamic resonator sensors. Full article

(This article belongs to the Proceedings of Proceedings of Eurosensors 2017, Paris, France, 3–6 September 2017)

► Show Figures

Figure 1

5 pages, 797 KiB

Open AccessProceeding Paper

A Novel Gyroscopic Actuation Concept for 2D MEMS Micromirrors

by Philip Kaupmann, Stefan Pinter, Jochen Franz, Reinhard Streiter and Thomas Otto

Proceedings 2017, 1(4), 546; https://doi.org/10.3390/proceedings1040546 - 9 Aug 2017

Cited by 2 | Viewed by 2106

Abstract

In this paper we present a novel approach to achieve indirect quasistatic deflection of 2D MEMS scanning micromirrors by solely resonant excitation utilizing gyroscopic effects. Therefore the micromirror is set to oscillate in its mirror plane additionally to its primary resonant oscillation with [...] Read more.

In this paper we present a novel approach to achieve indirect quasistatic deflection of 2D MEMS scanning micromirrors by solely resonant excitation utilizing gyroscopic effects. Therefore the micromirror is set to oscillate in its mirror plane additionally to its primary resonant oscillation with a similar frequency. According to angular momentum conservation this leads to a quasistatic deflection along a third axis orthogonal to the former. To investigate the applicability to MEMS micromirrors we develop a reference MEMS design to be used for fully transient FEM simulation. To achieve consistent simulation results we further develop a closed loop control algorithm. We then perform simulations using this method to prove the viability of the proposed concept Full article

(This article belongs to the Proceedings of Proceedings of Eurosensors 2017, Paris, France, 3–6 September 2017)

► Show Figures

Figure 1

5 pages, 868 KiB

Open AccessProceeding Paper

Photonic Gas Sensor Using a Silicon Strip Waveguide

by Christian Ranacher, Andreas Tortschanoff, Cristina Consani, Mohssen Moridi, Thomas Grille and Bernhard Jakoby

Proceedings 2017, 1(4), 547; https://doi.org/10.3390/proceedings1040547 - 25 Aug 2017

Cited by 1 | Viewed by 2902

Abstract

Sensing of gases is a promising area for applications of photonic systems operating in the mid-infrared spectral range. We present an infrared evanescent-field absorption gas sensor based on a silicon strip waveguide, which was specifically designed for CO₂ sensing. We discuss finite [...] Read more.

Sensing of gases is a promising area for applications of photonic systems operating in the mid-infrared spectral range. We present an infrared evanescent-field absorption gas sensor based on a silicon strip waveguide, which was specifically designed for CO₂ sensing. We discuss finite element simulations that were used to design the strip waveguide and furthermore present experimental data of quantitative CO₂ measurements with the devised structures. The first demonstrator device detects concentrations down to 5000 ppm CO₂ which is the workplace exposure limit in most jurisdictions. Full article

(This article belongs to the Proceedings of Proceedings of Eurosensors 2017, Paris, France, 3–6 September 2017)

► Show Figures

Figure 1

4 pages, 1447 KiB

Open AccessProceeding Paper

A Portable, Optical Scanning System for Large Field of View, High Resolution Imaging of Biological Specimens

by Georgia Korompili, Georgios Kanakaris, Christos Ampatis and Nikos Chronis

Proceedings 2017, 1(4), 548; https://doi.org/10.3390/proceedings1040548 - 29 Aug 2017

Viewed by 2118

Abstract

Large field-of-view (FOV), high resolution imaging of biological specimens isa challenging task, requiring sophisticated and bulky optical systems. Such systems cannot be used for diagnosing or monitoring a disease at the point-of-care. To address this need, we developeda portable, optical system that can [...] Read more.

Large field-of-view (FOV), high resolution imaging of biological specimens isa challenging task, requiring sophisticated and bulky optical systems. Such systems cannot be used for diagnosing or monitoring a disease at the point-of-care. To address this need, we developeda portable, optical system that can image—with a 2.88 μm resolution—large areas (6 mm × 40 mm) from various biological samples by performing scanning in one direction. This is achieved through the use of a microfabricated, mini-lens array. We demonstrated that our system can detect single cells from a smear blood test and thus validating our vision for its use at the point-of-care. Full article

(This article belongs to the Proceedings of Proceedings of Eurosensors 2017, Paris, France, 3–6 September 2017)

► Show Figures

Figure 1

5 pages, 479 KiB

Open AccessProceeding Paper

Development and Evaluation of Tri-Axial Fiber Bragg Grating Force Sensor for Catheter

by Dongjoo Shin, Hyeong-U Kim, Atul Kulkarni and Taesung Kim

Proceedings 2017, 1(4), 549; https://doi.org/10.3390/proceedings1040549 - 24 Aug 2017

Cited by 4 | Viewed by 2389

Abstract

Abstract: Avoiding the electromagnetic interference is one of the most difficult technical challenge during catheterization. The use of an optical fiber force sensor in the catheter can be an alternative. Herein, two flexure structures were designed for catheter tip and simulated using [...] Read more.

Abstract: Avoiding the electromagnetic interference is one of the most difficult technical challenge during catheterization. The use of an optical fiber force sensor in the catheter can be an alternative. Herein, two flexure structures were designed for catheter tip and simulated using ANSYS to verify their sensitivity and durability. Fiber Bragg Grating sensors were configured to measure the tri-axial force exerted on the catheter tip. Calibrated result shows that an optical fiber force sensor can measure an axial force of up to 50 gF with an accuracy of 1 gF. Our calibration results demonstrate reliable measurement with high accuracy with repeatability. Full article

(This article belongs to the Proceedings of Proceedings of Eurosensors 2017, Paris, France, 3–6 September 2017)

► Show Figures

Figure 1

5 pages, 689 KiB

Open AccessProceeding Paper

Evanescent-Wave Gas Sensing Using an Integrated Thermal Light Source

by Cristina Consani, Christian Ranacher, Andreas Tortschanoff, Thomas Grille, Peter Irsigler and Bernhard Jakoby

Proceedings 2017, 1(4), 550; https://doi.org/10.3390/proceedings1040550 - 17 Aug 2017

Cited by 2 | Viewed by 2536

Abstract

The last years showed an increased request for miniaturised, CMOS-compatible gas detectors. In contrast to sensors utilizing metal-oxide chemical interfaces, optical strategies are potentially faster and more robust. Recently we demonstrated CO₂ detection by evanescent-wave absorption in the mid-infrared using a combination [...] Read more.

The last years showed an increased request for miniaturised, CMOS-compatible gas detectors. In contrast to sensors utilizing metal-oxide chemical interfaces, optical strategies are potentially faster and more robust. Recently we demonstrated CO₂ detection by evanescent-wave absorption in the mid-infrared using a combination of an external laser source and silicon waveguides based on CMOS technology. We now go one step further and demonstrate the feasibility of detection of CO₂ down to a concentration of 3% with a low-cost integrated thermal source. These results are promising for further technological developments towards on-chip mid-infrared photonic gas sensors, and new designs are currently devised to increase the yet relatively low sensitivity. Full article

(This article belongs to the Proceedings of Proceedings of Eurosensors 2017, Paris, France, 3–6 September 2017)

► Show Figures

Figure 1

4 pages, 1036 KiB

Open AccessProceeding Paper

Uniform Fabrication of Moems Arrays Using Dry Thick Resist Films

by Thierry Camps, Sami Abada, Benjamin Reig, Jean-Baptiste Doucet, Rémi Courson, Laurène Salvi, Benjamin Boisnard, Emmanuelle Daran and Véronique Bardinal

Proceedings 2017, 1(4), 551; https://doi.org/10.3390/proceedings1040551 - 16 Aug 2017

Viewed by 1806

Abstract

This study aims at focusing a laser beam at the center of a microfluidic channel for optical bio-sensing applications thanks to the collective integration of tunable microlens arrays on VCSELs devices. High aspect-ratio polymer-based MOEMS are successfully fabricated on small-sized samples using thick [...] Read more.

This study aims at focusing a laser beam at the center of a microfluidic channel for optical bio-sensing applications thanks to the collective integration of tunable microlens arrays on VCSELs devices. High aspect-ratio polymer-based MOEMS are successfully fabricated on small-sized samples using thick dry photoresist films. Such dry films are easier to use and less expensive than standard thick SU-8 and can be efficiently stacked on fragile GaAs samples using a soft-thermal-printing technique. By combining double UV exposure and planar metallization, uniform fabrication of MOEMS arrays is enabled and fabricated devices exhibit reproducible electro-thermal behavior. Full article

(This article belongs to the Proceedings of Proceedings of Eurosensors 2017, Paris, France, 3–6 September 2017)

► Show Figures

Figure 1

4 pages, 709 KiB

Open AccessProceeding Paper

LED-Based Tomographic Imaging for Live-Cell Monitoring of Pancreatic Islets in Microfluidic Channels

by Gregor Scholz, Qifeng Xu, Torben Schulze, Heidi Boht, Kai Mattern, Jana Hartmann, Andreas Dietzel, Stephan Scherneck, Ingo Rustenbeck, Joan Daniel Prades, Sönke Fündling, Hutomo Suryo Wasisto and Andreas Waag

Proceedings 2017, 1(4), 552; https://doi.org/10.3390/proceedings1040552 - 22 Aug 2017

Cited by 9 | Viewed by 2891

Abstract

A portable lensless imaging device combining light-emitting diodes (LEDs) and a CMOS image sensor was developed and its suitability for non-invasive live-cell in vitro monitoring of pancreatic islets was demonstrated. A microfluidic lab-on-a-chip platform containing micro wells with various depths was also fabricated [...] Read more.

A portable lensless imaging device combining light-emitting diodes (LEDs) and a CMOS image sensor was developed and its suitability for non-invasive live-cell in vitro monitoring of pancreatic islets was demonstrated. A microfluidic lab-on-a-chip platform containing micro wells with various depths was also fabricated and integrated into the optical sensor system, which allows for immobilization of the single islets and continuous recording of their behavior. This promising technique may provide further insight into the structure and function of pancreatic islets and their deficiencies in type 2 diabetes. Full article

(This article belongs to the Proceedings of Proceedings of Eurosensors 2017, Paris, France, 3–6 September 2017)

► Show Figures

Figure 1

4 pages, 2237 KiB

Open AccessProceeding Paper

Post Fabrication Processing of Foundry MEMS Structures Exhibiting Large, Out-of-Plane Deflections

by LaVern Starman, John Walton, Harris Hall and Robert Lake

Proceedings 2017, 1(4), 553; https://doi.org/10.3390/proceedings1040553 - 18 Aug 2017

Cited by 1 | Viewed by 2209

Abstract

This research effort is focused on the development of large angle, out-of-plane bimorph MEMS micromirrors fabricated in the PolyMUMPs foundry process. Based on design constraints of the PolyMUMPs process, current designs fabricated do not meet the requirements to enable large angle optical steering. [...] Read more.

This research effort is focused on the development of large angle, out-of-plane bimorph MEMS micromirrors fabricated in the PolyMUMPs foundry process. Based on design constraints of the PolyMUMPs process, current designs fabricated do not meet the requirements to enable large angle optical steering. Through Comsol modeling and simulation, several post-processing techniques were discovered that could be used to meet the required large out-of-plane deflections. We have performed several post-processing techniques to include silicon nitride and high temperature evaporated gold to verify our Comsol modeling results. Our experimental tests validate the Comsol results of greater than 400 μm deflections are achievable Full article

(This article belongs to the Proceedings of Proceedings of Eurosensors 2017, Paris, France, 3–6 September 2017)

► Show Figures

Figure 1

4 pages, 1005 KiB

Open AccessProceeding Paper

A Lorentz Force Actuated Continuous Deformable Polymer Mirror for Wavefront Control

by Byoungyoul Park, Elnaz Afsharipour and Cyrus Shafai

Proceedings 2017, 1(4), 554; https://doi.org/10.3390/proceedings1040554 - 11 Aug 2017

Cited by 1 | Viewed by 2082

Abstract

This paper describes MEMS deformable polymer mirror system for adaptive optics application. This system employs a 4 µm thick SU-8 membrane with a stress balanced double side aluminum coating as a mirror element. Underlying Lorentz actuators are used to control the surface topography [...] Read more.

This paper describes MEMS deformable polymer mirror system for adaptive optics application. This system employs a 4 µm thick SU-8 membrane with a stress balanced double side aluminum coating as a mirror element. Underlying Lorentz actuators are used to control the surface topography of the mirror, enabling optical wavefront correction. Compared to electrostatic, piezoelectric, and thermal actuators, the Lorentz actuators offer low voltage drive (<1 V), high deflection, and bi-directional motion. Mirror deflection of up to 45 µm was demonstrated, with lower deflections of 10 µm achieved with actuator heating below 10 °C. Full article

(This article belongs to the Proceedings of Proceedings of Eurosensors 2017, Paris, France, 3–6 September 2017)

► Show Figures

Figure 1

4 pages, 596 KiB

Open AccessProceeding Paper

Binary Zone Plate Infrared Spectrometer for Dissolved Gas Analysis in High Voltage Equipment

by Pawel Glowacki and Cyrus Shafai

Proceedings 2017, 1(4), 555; https://doi.org/10.3390/proceedings1040555 - 16 Aug 2017

Viewed by 1797

Abstract

An IR spectrometer based on a Binary Zone Plate (BZP) is presented for dissolved gas analysis. The wavelength selective focal length of the BZP can effectively discriminate between wavelengths ranging from 800 nm to 8 μm, by adjusting the focus distance onto an [...] Read more.

An IR spectrometer based on a Binary Zone Plate (BZP) is presented for dissolved gas analysis. The wavelength selective focal length of the BZP can effectively discriminate between wavelengths ranging from 800 nm to 8 μm, by adjusting the focus distance onto an aperture in the image plane from 19 mm to 200 mm. The aperture serves to pass focused radiation onto the detector. The BZP has a focal length of 50 mm for a design wavelength of 3 μm, with 400 zones. This design enables discrimination between all key fault gases present in oil impregnated high voltage equipment. Full article

(This article belongs to the Proceedings of Proceedings of Eurosensors 2017, Paris, France, 3–6 September 2017)

► Show Figures

Figure 1

4 pages, 576 KiB

Open AccessProceeding Paper

A Miniaturized UV-LED Based Optical Gas Sensor Utilizing Silica Waveguides for the Measurement of Nitrogen Dioxide and Sulphur Dioxide

by Philipp Elmlinger, Martin Schreivogel, Simon Weida and Michael Kneissl

Proceedings 2017, 1(4), 556; https://doi.org/10.3390/proceedings1040556 - 15 Aug 2017

Cited by 1 | Viewed by 2401

Abstract

Continuing advances in the development of light-emitting diodes (LEDs) in the deep ultraviolet spectral range (DUV) enable miniaturized, mobile, and cost-effective DUV gas sensors. Efficient light coupling, guiding, and splitting plays a key role for stable sensor systems and is realized by lowloss [...] Read more.

Continuing advances in the development of light-emitting diodes (LEDs) in the deep ultraviolet spectral range (DUV) enable miniaturized, mobile, and cost-effective DUV gas sensors. Efficient light coupling, guiding, and splitting plays a key role for stable sensor systems and is realized by lowloss silica based waveguides, fabricated by ultrashort pulsed laser etching and laser polishing. The tapered waveguide leads to a significantly higher efficiency with less required space compared to optical fibers or free beam setups, respectively. Toxic gases like NO₂ and SO₂ were successfully measured down to 1 ppm utilizing LEDs with wavelengths of 395 nm and 280 nm. Full article

(This article belongs to the Proceedings of Proceedings of Eurosensors 2017, Paris, France, 3–6 September 2017)

► Show Figures

Figure 1

5 pages, 1672 KiB

Open AccessProceeding Paper

Analysis of pn Junction Deep Trench Isolation with SU-8/SiO₂-Liner Passivation in a Linear Butt-Coupled 3D CMOS Si Photodetector Array

by Iman Sabri Alirezaei, Joerg Vierhaus and Edmund P. Burte

Proceedings 2017, 1(4), 557; https://doi.org/10.3390/proceedings1040557 - 7 Jun 2017

Cited by 1 | Viewed by 4375

Abstract

The realization of 30 µm-deep trench isolation in a linear array of butt-coupled 3D CMOS silicon photodetectors is investigated by implementing the formation of a shallow n⁺-p junction and SiO₂-liner over the trench sidewalls as well as the SU-8 [...] Read more.

The realization of 30 µm-deep trench isolation in a linear array of butt-coupled 3D CMOS silicon photodetectors is investigated by implementing the formation of a shallow n⁺-p junction and SiO₂-liner over the trench sidewalls as well as the SU-8 filling trenches for passivation. The dependency of the dark I-V curve on the trench isolation scheme is analyzed by monitoring the dynamic dark I-V measurements of four samples including the schemes of single-trench isolation with different widths and the scheme of double-trench isolation. The highest and the lowest dark currents are measured in the detectors with the widest single-trench isolation and the double-trench isolation, respectively. Full article

(This article belongs to the Proceedings of Proceedings of Eurosensors 2017, Paris, France, 3–6 September 2017)

► Show Figures

Figure 1

5 pages, 1275 KiB

Open AccessProceeding Paper

Metasurface-Based THz Dual-Band Absorber Sensor for the Measurement of Refractive Index Variations of Chemical and Biological Substances

by Mohammed Janneh, Andrea De Marcellis, Elia Palange, Ayodya T. Tenggara and Doyoung Byun

Proceedings 2017, 1(4), 558; https://doi.org/10.3390/proceedings1040558 - 16 Aug 2017

Cited by 2 | Viewed by 2160

Abstract

In this paper we report on the results of the simulations of the electromagnetic properties of a metasurface composed of a 2D-array of plasmonic nanoantennas acting as polarisation insensitive dual band THz perfect absorber able to achieve absorption coefficients and quality factors up [...] Read more.

In this paper we report on the results of the simulations of the electromagnetic properties of a metasurface composed of a 2D-array of plasmonic nanoantennas acting as polarisation insensitive dual band THz perfect absorber able to achieve absorption coefficients and quality factors up to 99.6% and 122, respectively. The 2D-array is designed on top of a polyimide flexible film separating it from an Ag ground layer. The plasmonic nanoantenna is composed of two Ag quadrangular rings and an Ag diamond-shape dot is placed at their geometrical centre. The absorption resonances show a linear frequency shift with respect to variations of the refractive index of transparent substances adsorbed on the metasurface. This allows the dual-band absorber to be employed as a sensor of the chemical/physical modifications taking place on the substance. In particular, in terms of the refractive index units, the sensor based on the dual-band absorber can achieve sensitivities up to 310 GHz/RIU. Full article

(This article belongs to the Proceedings of Proceedings of Eurosensors 2017, Paris, France, 3–6 September 2017)

► Show Figures

Figure 1

5 pages, 1014 KiB

Open AccessProceeding Paper

Integrated SiGe Detectors for Si Photonic Sensor Platforms

by Grégory Pandraud, Silvana Milosavljevic, Amir Sammak, Matteo Cherchi, Aleksandar Jovic and Pasqualina Sarro

Proceedings 2017, 1(4), 559; https://doi.org/10.3390/proceedings1040559 - 11 Aug 2017

Cited by 4 | Viewed by 2417

Abstract

In this work, we present the results of integrated Ge detectors grown on a Si photonic platform for sensing applications. The detectors are fabricated on a passive photonic circuit for maximum coupling efficiency. Measurement results at 1300 nm wavelength show a responsivity of [...] Read more.

In this work, we present the results of integrated Ge detectors grown on a Si photonic platform for sensing applications. The detectors are fabricated on a passive photonic circuit for maximum coupling efficiency. Measurement results at 1300 nm wavelength show a responsivity of 0.2 A/W and very low dark current levels. For a voltage range between 0 and −10 V, the dark current is better than 0.1 nA which is crucial for highly sensitivity devices and applications, like Optical Coherence Tomography. Full article

(This article belongs to the Proceedings of Proceedings of Eurosensors 2017, Paris, France, 3–6 September 2017)

► Show Figures

Figure 1

4 pages, 554 KiB

Open AccessProceeding Paper

SERS Active Periodic 3D Structure for Trapping and High Sensitive Molecular Analysis of Particles or Cells

by István Rigó, Miklós Veres and Péter Fürjes

Proceedings 2017, 1(4), 560; https://doi.org/10.3390/proceedings1040560 - 8 Aug 2017

Cited by 2 | Viewed by 1790

Abstract

In this work the highly sensitive molecule recognition performance of a specially designed surface enhanced Raman scattering (SERS) substrate was demonstrated. The general inverse pyramid structures were modified to be able to perform as cavities in perforated membrane applicable for particle and cell [...] Read more.

In this work the highly sensitive molecule recognition performance of a specially designed surface enhanced Raman scattering (SERS) substrate was demonstrated. The general inverse pyramid structures were modified to be able to perform as cavities in perforated membrane applicable for particle and cell filtering, sorting and trapping. In the voids of the gold covered substrate size compatible particles functionalised by different molecules were trapped, their SERS signal was detected and the different molecules were recognised. Full article

(This article belongs to the Proceedings of Proceedings of Eurosensors 2017, Paris, France, 3–6 September 2017)

► Show Figures

Figure 1

4 pages, 864 KiB

Open AccessProceeding Paper

Piezoelectrically Driven and Sensed Micromirrors with Extremely Large Scan Angles and Precise Closed-Loop Control

by Shanshan Gu-Stoppel, Thorsten Giese, Hans-Joachim Quenzer, Ulrich Hofmann and Wolfgang Benecke

Proceedings 2017, 1(4), 561; https://doi.org/10.3390/proceedings1040561 - 16 Aug 2017

Cited by 4 | Viewed by 2522

Abstract

This paper reports piezoelectrically driven and sensed micromirrors achieving extremely large total optical scan angle of 106° and high frequency of 45 kHz at 22 V. To reach such large angles, extensive FEM-simulations relating to fracture strength of poly-Si, of which these micromirrors [...] Read more.

This paper reports piezoelectrically driven and sensed micromirrors achieving extremely large total optical scan angle of 106° and high frequency of 45 kHz at 22 V. To reach such large angles, extensive FEM-simulations relating to fracture strength of poly-Si, of which these micromirrors primarily consist, have been performed. Meanwhile, high Q-factor of more than 5000 under ambient conditions and low power consumption of 10.3 mW were measured. Moreover the piezoelectric elements enable position sensing and based on the feedback signals closed-loop control has been developed. Full article

(This article belongs to the Proceedings of Proceedings of Eurosensors 2017, Paris, France, 3–6 September 2017)

► Show Figures

Figure 1

4 pages, 450 KiB

Open AccessProceeding Paper

Evanescent Waveguide Sensor for On-Chip Biomolecular Detection

by Giampiero de Cesare, Rita Asquini, Alessio Buzzin and Domenico Caputo

Proceedings 2017, 1(4), 562; https://doi.org/10.3390/proceedings1040562 - 30 Aug 2017

Viewed by 2191

Abstract

This work presents analysis and development of an evanescent waveguide sensor system, which integrates an amorphous silicon photodiode and a glass-diffused waveguide. Design of the system includes a study of thickness and refractive index of the transparent electrode of the diode, which are [...] Read more.

This work presents analysis and development of an evanescent waveguide sensor system, which integrates an amorphous silicon photodiode and a glass-diffused waveguide. Design of the system includes a study of thickness and refractive index of the transparent electrode of the diode, which are crucial parameters for the optimization of the optical coupling between the waveguide and the photodetector. Preliminary electro-optical measurements on the fabricated device show excellent system performances, and suggest its use for on-chip detection in lab-on-chip applications. Full article

(This article belongs to the Proceedings of Proceedings of Eurosensors 2017, Paris, France, 3–6 September 2017)

► Show Figures

Figure 1

4 pages, 787 KiB

Open AccessProceeding Paper

A MEMS-Controllable Fresnel Zone Plate for Miniaturized UV Spectrometer

by Elnaz Afsharipour, Pawel Glowacki and Cyrus Shafai

Proceedings 2017, 1(4), 563; https://doi.org/10.3390/proceedings1040563 - 5 Sep 2017

Cited by 1 | Viewed by 2049

Abstract

This work presents the design and simulation of a MEMS-controllable linear motion Fresnel Zone Plate (FZP). The focal length of an FZP is a function of incident wavelength. This principle can be used for separating wavelengths, enabling a spectrometer application. The FZP of [...] Read more.

This work presents the design and simulation of a MEMS-controllable linear motion Fresnel Zone Plate (FZP). The focal length of an FZP is a function of incident wavelength. This principle can be used for separating wavelengths, enabling a spectrometer application. The FZP of this work is designed on a linearly moving MEMS actuator, enabling wavelength focusing onto a fixed image plane. The FZP is designed with 400 zones, which can focus wavelengths from 150 nm to 410 nm by moving on a distance of 1 mm. Full article

(This article belongs to the Proceedings of Proceedings of Eurosensors 2017, Paris, France, 3–6 September 2017)

► Show Figures

Figure 1

4 pages, 1080 KiB

Open AccessProceeding Paper

A Laser-Machined Stainless-Steel Micro-Scanner for Confocal Microscopy

by H. A. Oyman, M. A. Icel, B. C. Efe, Y. D. Gokdel, O. Ferhanoglu and A. D. Yalcinkaya

Proceedings 2017, 1(4), 564; https://doi.org/10.3390/proceedings1040564 - 7 Aug 2017

Viewed by 2214

Abstract

A stainless-steel based micro-scanner with magnetic actuation is fabricated via laser-cutting technology targeted for confocal microscopy. Laser cutting offers low-cost and high speed fabrication of such scanners. The device is designed to establish a 2D Lissajous pattern. For a coil drive of 180 [...] Read more.

A stainless-steel based micro-scanner with magnetic actuation is fabricated via laser-cutting technology targeted for confocal microscopy. Laser cutting offers low-cost and high speed fabrication of such scanners. The device is designed to establish a 2D Lissajous pattern. For a coil drive of 180 mA, fabricated scanner is able to deliver 4 degrees of optical scan angle for both slow scan and fast scan axes at 663 Hz and 2211 Hz, respectively. Fabricated mirror is integrated into a confocal microscopy setup and tested with the United States Air Force target accomplishing a 200 μm × 200 μm field of view and sub 10 μm resolution. With further improvement, our scanner will contribute to manufacturing of low-cost and compact scanning microscopy technologies. Full article

(This article belongs to the Proceedings of Proceedings of Eurosensors 2017, Paris, France, 3–6 September 2017)

► Show Figures

Figure 1

5 pages, 1397 KiB

Open AccessProceeding Paper

Wireless Sensing System for Long-Time Assistance in the Parkinson’s Disease

by Fernanda Irrera, Ardian Kita, Rosario Rao and Antonio Suppa

Proceedings 2017, 1(4), 565; https://doi.org/10.3390/proceedings1040565 - 25 Aug 2017

Viewed by 1665

Abstract

A non-invasive wearable wireless sensing system for assisting patients affected by Parkinson’s Disease is proposed. It uses inertial sensors to recognize gait states and involuntary gait freezing. The system is designed for indoor and outdoor long-time monitoring and realizes an individual electronic diary [...] Read more.

A non-invasive wearable wireless sensing system for assisting patients affected by Parkinson’s Disease is proposed. It uses inertial sensors to recognize gait states and involuntary gait freezing. The system is designed for indoor and outdoor long-time monitoring and realizes an individual electronic diary useful for doctors for estimating better the stage of the disease and customizing the pharmacological therapy. Standard tests were performed on a noticeable number of patients. The system performances are the state-of-art in the detection of specific movement disorders of PD patients. The algorithm demonstrated its reliability and robustness respect to individual specific gait and postural behaviors. Full article

(This article belongs to the Proceedings of Proceedings of Eurosensors 2017, Paris, France, 3–6 September 2017)

► Show Figures

Figure 1

4 pages, 481 KiB

Open AccessProceeding Paper

In-Vivo Implantable Sensor System for Measuring Bladder Wall Movements

by Tristan Weydts, Luigi Brancato, Mohammad A. Soebadi, Dirk De Ridder and Robert Puers

Proceedings 2017, 1(4), 566; https://doi.org/10.3390/proceedings1040566 - 17 Aug 2017

Cited by 3 | Viewed by 1913

Abstract

The design and implementation of a medical implantable device for bladder monitoring is presented. A network of accelerometers is to be implanted in-between the outside bladder muscle and the mucous membrane. A pressure sensor is also implanted in this submucosal layer to obtain [...] Read more.

The design and implementation of a medical implantable device for bladder monitoring is presented. A network of accelerometers is to be implanted in-between the outside bladder muscle and the mucous membrane. A pressure sensor is also implanted in this submucosal layer to obtain intraluminal pressure readings. The sensor system is powered by an implanted battery and provides a wireless communication link for data and control. A smart measurement protocol allows the system to be operational for several weeks. The sensors are mounted on a flexible printed circuit board that can be elongated up to 250%, to accommodate the natural stretching of the bladder organ tissue during filling. Full article

(This article belongs to the Proceedings of Proceedings of Eurosensors 2017, Paris, France, 3–6 September 2017)

► Show Figures

Figure 1

4 pages, 2019 KiB

Open AccessProceeding Paper

DC Current Beat: Wireless and Non-Invasive DC Current Sensing Scheme

by Koichiro Ishibashi, Makoto Serizawa, Ryohei Takitoge, Shohei Ishigaki and Tsuyoshi Ishige

Proceedings 2017, 1(4), 567; https://doi.org/10.3390/proceedings1040567 - 24 Sep 2017

Cited by 8 | Viewed by 2203

Abstract

This paper presents a wireless and Non-invasive DC Current (DCC) sensing scheme as an IoT sensors. A RF module transmits only ID codes to a receiver, and the ID transmissions are called as “DCC Beat”. The interval time of DCC Beats depend on [...] Read more.

This paper presents a wireless and Non-invasive DC Current (DCC) sensing scheme as an IoT sensors. A RF module transmits only ID codes to a receiver, and the ID transmissions are called as “DCC Beat”. The interval time of DCC Beats depend on the inductance of ferrite clamp which is non-invasively installed at the wire of the DC current to be measured, so that the interval time corresponds to DC Current. The ID data transmission range reaches up to 50 m with 1.2 mW operating power using a 2.4 GHz RF module. DC current from 0.2 to 4 A can be measured within error of 5.7%. Full article

(This article belongs to the Proceedings of Proceedings of Eurosensors 2017, Paris, France, 3–6 September 2017)

► Show Figures

Figure 1

4 pages, 892 KiB

Open AccessProceeding Paper

A Radio-Triggered Wireless Sensor Platform Powered by Soil Bacteria

by Davide Brunelli, Maurizio Rossi and Pietro Tosato

Proceedings 2017, 1(4), 568; https://doi.org/10.3390/proceedings1040568 - 21 Aug 2017

Cited by 1 | Viewed by 2108

Abstract

In the era of the Internet of Things (IoT), where data sensing is expected anywhere and anytime, important issues about energy autonomy of sensors and acquisition systems are still open. This work addresses the problem of powering sensors and transmitting efficiently data on [...] Read more.

In the era of the Internet of Things (IoT), where data sensing is expected anywhere and anytime, important issues about energy autonomy of sensors and acquisition systems are still open. This work addresses the problem of powering sensors and transmitting efficiently data on request in a multitude of outdoor/indoor applications, where the presence of soil is considered (e.g., smart farming, home surveillance, smart cities …). We present an ultra-low power wireless architecture, supplied directly by colony of bacteria naturally present in any kind of soil on Earth. The ultra-low power challenges limit the use of wireless communication at the minimum (receiving radio off). Nevertheless, the system is still ready to promptly start any incoming communication thanks to a radio-trigger sub-circuit capable of detecting receiving messages at nearly-zero power consumption. Full article

(This article belongs to the Proceedings of Proceedings of Eurosensors 2017, Paris, France, 3–6 September 2017)

► Show Figures

Figure 1

4 pages, 330 KiB

Open AccessProceeding Paper

Automatic Wireless Monitoring System for Real-Time Rock Fall Events

by Gianluca Barile, Giuseppe Ferri, Alfiero Leoni, Mirco Muttillo, Leonardo Pantoli, Vincenzo Stornelli and Daniele Vettori

Proceedings 2017, 1(4), 569; https://doi.org/10.3390/proceedings1040569 - 11 Aug 2017

Cited by 4 | Viewed by 1889

Abstract

In this work; we present an innovative sensing system able to recognize a rock fall event and to monitor the structural parameters of a falling rock protection barrier. The system has been conceived and optimized for any protection barrier; gabion mesh or concrete [...] Read more.

In this work; we present an innovative sensing system able to recognize a rock fall event and to monitor the structural parameters of a falling rock protection barrier. The system has been conceived and optimized for any protection barrier; gabion mesh or concrete blocks; it has a modular and flexible architecture; organized with a control unit and sensing nodes that can be arranged directly on the considered site. This architecture provides information about the vibration and the inclination of the falling rock protection barrier. The data; continuously monitored; are collected on a web server responsible to check the overall status of the barrier itself and to generate and send automatic messages for any criticisms. A web application has been also developed for system monitoring; to create summary report and to analyze the data collected. The novel system is currently working on a gabion protecting mesh installed in the south of Italy. Full article

(This article belongs to the Proceedings of Proceedings of Eurosensors 2017, Paris, France, 3–6 September 2017)

► Show Figures

Figure 1

4 pages, 1088 KiB

Open AccessProceeding Paper

Low-Power Odor-Sensing Network Based on Wake-Up Nodes

by Alvaro Ortiz Perez, Benedikt Bierer, Cem Dinc, Jürgen Wöllenstein and Stefan Palzer

Proceedings 2017, 1(4), 570; https://doi.org/10.3390/proceedings1040570 - 25 Aug 2017

Viewed by 2092

Abstract

The localization of bad odors is a long standing issue with high relevance for affected people because of the health and safety implications. In order to enable the detection and localization of bad odors we propose a wireless, low-power consuming sensor network. The [...] Read more.

The localization of bad odors is a long standing issue with high relevance for affected people because of the health and safety implications. In order to enable the detection and localization of bad odors we propose a wireless, low-power consuming sensor network. The sensor nodes are designed to wake-up upon initial detection of a bad odor to then start to measure the strength of the odor. Taking into account the spatial variation of the bad odor as well as environmental parameters the odor source may be identified. After the odor vanishes the sensor nodes return to sleep mode. Full article

(This article belongs to the Proceedings of Proceedings of Eurosensors 2017, Paris, France, 3–6 September 2017)

► Show Figures

Figure 1

4 pages, 1008 KiB

Open AccessProceeding Paper

Fabrication of Planar Copper Microcoils for Telemetric Orthodontic Applications

by Julian Hafner, Matthias Kuhl, Michael Schwaerzle, Thorsten Hehn, Daniel Rossbach and Oliver Paul

Proceedings 2017, 1(4), 571; https://doi.org/10.3390/proceedings1040571 - 9 Aug 2017

Cited by 1 | Viewed by 2629

Abstract

The fabrication of electroplated planar copper microcoils for telemetric orthodontic applications is presented. A set of microcoils with overall dimensions of 2 × 2.5 × 0.5 mm³, track widths down to 5 μm and turn numbers up to 35 were fabricated [...] Read more.

The fabrication of electroplated planar copper microcoils for telemetric orthodontic applications is presented. A set of microcoils with overall dimensions of 2 × 2.5 × 0.5 mm³, track widths down to 5 μm and turn numbers up to 35 were fabricated on glass substrates. The coils were electrically characterized and assembled via flip-chip bonding onto a stress-mapping CMOS chip for smart orthodontic brackets. The passive system was successfully read out telemetrically with a reader microcoil for a coil-coil distance of 1 mm at 13.56 MHz. The digital signal representing the measured stress values was extracted telemetrically using a commercially available RFID reader. Full article

(This article belongs to the Proceedings of Proceedings of Eurosensors 2017, Paris, France, 3–6 September 2017)

► Show Figures

Figure 1

4 pages, 748 KiB

Open AccessProceeding Paper

Magnetomotive and Tension-Based Tuning of a Micromechanical Resonator

by Mahmut Bicer, Arda D. Yalcinkaya and B. Erdem Alaca

Proceedings 2017, 1(4), 572; https://doi.org/10.3390/proceedings1040572 - 23 Aug 2017

Cited by 2 | Viewed by 1750

Abstract

Bidirectional frequency tuning in microresonators is demonstrated through the simultaneous use of both mechanical (stretching) and magnetomotive approaches. Stretching is employed to increase the resonance frequency, while the magnetomotive method provides actuation and spring softening. The fabrication process is presented for a double-clamped [...] Read more.

Bidirectional frequency tuning in microresonators is demonstrated through the simultaneous use of both mechanical (stretching) and magnetomotive approaches. Stretching is employed to increase the resonance frequency, while the magnetomotive method provides actuation and spring softening. The fabrication process is presented for a double-clamped micromechanical nickel resonator. Lorentz Force is used for excitation and flexural deformation of the resonator. A substrate bending method is utilized to introduce uniaxial tension in the resonator. As a result of flexural deformation, up to 13% decrease in the resonance frequency is achieved. An 8% increase in the resonance frequency is obtained by the stretching method. The presented study is the first demonstration of the combination of the aforementioned techniques for the bidirectional and wide-range frequency tuning up to 200 kHz. Full article

(This article belongs to the Proceedings of Proceedings of Eurosensors 2017, Paris, France, 3–6 September 2017)

► Show Figures

Figure 1

5 pages, 1631 KiB

Open AccessProceeding Paper

Urban Air Quality Monitoring with Networked Low-Cost Sensor-Systems

by Michele Penza, Domenico Suriano, Valerio Pfister, Mario Prato and Gennaro Cassano

Proceedings 2017, 1(4), 573; https://doi.org/10.3390/proceedings1040573 - 8 Aug 2017

Cited by 27 | Viewed by 4143

Abstract

A sensors network based on 11 nodes (10 stationary and 1 mobile mounted on public bus) distributed in Bari (Italy) has been deployed for urban air quality (AQ) monitoring. The low-cost sensor-systems have been installed in specific sites (buildings, offices, schools, streets, port, [...] Read more.

A sensors network based on 11 nodes (10 stationary and 1 mobile mounted on public bus) distributed in Bari (Italy) has been deployed for urban air quality (AQ) monitoring. The low-cost sensor-systems have been installed in specific sites (buildings, offices, schools, streets, port, airport) to enhance environmental awareness of the citizens and to supplement the expensive official air monitoring stations with cost-effective sensor-nodes at high spatial and temporal resolution. Continuous measurements were performed by low-cost electrochemical gas sensors (CO, NO₂, O₃, SO₂), optical particle counter (PM_1.0, PM_2.5, PM₁₀), NDIR infrared sensor (CO₂), photo-ionisation detector (total VOCs), including microsensors for temperature and relative humidity. The sensors are running to assess the performance during a campaign (June 2015–December 2017) of several months for citizen science in sustainable smart cities. The air quality index (AQI) for a given pollutant has been measured and compared to the public reference environmental data. The results of the AQ monitoring long-term campaign for selected sensor-nodes are presented. Full article

(This article belongs to the Proceedings of Proceedings of Eurosensors 2017, Paris, France, 3–6 September 2017)

► Show Figures

Figure 1

4 pages, 530 KiB

Open AccessProceeding Paper

Ultrasonic Coupled Passive Wireless Oscillating Sensor System

by Taimur Aftab, Thomas Schaechtle, Joachim Hoppe, Di Shi, Dominik Schott and Leonhard Reindl

Proceedings 2017, 1(4), 574; https://doi.org/10.3390/proceedings1040574 - 12 Aug 2017

Cited by 2 | Viewed by 2544

Abstract

This paper presents, for the first time, an instrumentation technique for passively extracting a resonance frequency of a high-Q resonator across a wireless ultrasonic channel. As a first application, passive wireless measurement of temperature is presented along with a proof of concept of [...] Read more.

This paper presents, for the first time, an instrumentation technique for passively extracting a resonance frequency of a high-Q resonator across a wireless ultrasonic channel. As a first application, passive wireless measurement of temperature is presented along with a proof of concept of the wireless and passive operation of the device. Temperature resolution of 0.17 °C and a measurement range of 350 mm has been demonstrated. Full article

(This article belongs to the Proceedings of Proceedings of Eurosensors 2017, Paris, France, 3–6 September 2017)

► Show Figures

Figure 1

4 pages, 650 KiB

Open AccessProceeding Paper

RF Powered Gas Wireless Sensor Node for Smart Applications

by Alexander M. Baranov, Andrey Somov, Denis Spirjakin, Andrey Bragar and Alexey Karelin

Proceedings 2017, 1(4), 575; https://doi.org/10.3390/proceedings1040575 - 8 Aug 2017

Cited by 3 | Viewed by 2060

Abstract

Wireless Sensor Network (WSN) paradigm has been applied to a high number of monitoring and control applications. However, the constraint of WSN energy resources imposes restrictions on its truly ubiquitous and long-term deployments. We address the problem of autonomous long-term operation of a [...] Read more.

Wireless Sensor Network (WSN) paradigm has been applied to a high number of monitoring and control applications. However, the constraint of WSN energy resources imposes restrictions on its truly ubiquitous and long-term deployments. We address the problem of autonomous long-term operation of a gas wireless sensor by employing the far-field RF energy harvesting technology at 900 MHz in the power range from −20 dBm to 10 dBm. The node takes regular CH₄ or CO measurements and communicates the data to a wireless network coordinator at 2.4 GHz. Experimental results demonstrate that the optimized energy consumption of WSN, as well as energy harvesting of at least 1 mW (0 dBm) of ambient RF signal, ensure the ‘perpetual’ operation of WSN. Full article

(This article belongs to the Proceedings of Proceedings of Eurosensors 2017, Paris, France, 3–6 September 2017)

► Show Figures

Figure 1

4 pages, 518 KiB

Open AccessProceeding Paper

The Effect of Temperature and Strain on Power Conversion Efficiency of PVDF-Based Thermal Energy Harvesters

by Francois Bernard, Leticia Gimeno, Bernard Viala and Orphee Cugat

Proceedings 2017, 1(4), 576; https://doi.org/10.3390/proceedings1040576 - 24 Aug 2017

Cited by 2 | Viewed by 1909

Abstract

There can be a significant discrepancy between predicted and measured power conversion efficiency when using piezoelectric polymers for thermal energy harvesting. The influence of temperature and strain on electrical parameters can impact overall performances. We report the temperature and strain dependence of PVDF [...] Read more.

There can be a significant discrepancy between predicted and measured power conversion efficiency when using piezoelectric polymers for thermal energy harvesting. The influence of temperature and strain on electrical parameters can impact overall performances. We report the temperature and strain dependence of PVDF dielectric constant and losses and their impact on power conversion efficiency of composite thermal SMA-PVDF energy harvesters. Full article

(This article belongs to the Proceedings of Proceedings of Eurosensors 2017, Paris, France, 3–6 September 2017)

► Show Figures

Figure 1

5 pages, 911 KiB

Open AccessProceeding Paper

Energy Harvesting for Sensors of Structural Integrity in Wind Power Stations

by Christopher Behnke and Werner Karl Schomburg

Proceedings 2017, 1(4), 577; https://doi.org/10.3390/proceedings1040577 - 8 Aug 2017

Cited by 3 | Viewed by 1806

Abstract

The structural integrity of the rotors of wind power stations can be monitored by a variety of sensors. However, the power supply of the employed sensors should not be connected by cable because lightning strikes are provoked that way. Therefore, energy harvesting systems [...] Read more.

The structural integrity of the rotors of wind power stations can be monitored by a variety of sensors. However, the power supply of the employed sensors should not be connected by cable because lightning strikes are provoked that way. Therefore, energy harvesting systems are an interesting alternative. Three concepts for electrical power generation by harvesting the energy from the movements inside of rotor blades of wind power stations are described and compared to each other. Inside of such rotor blades, large vibration amplitudes of up to 15 cm are available but only at a frequency of a few Hertz. The available space is on the order of 20 × 20 × 40 cm³. A beam equipped with piezos and repelling magnets turned out being the most promising solution. Full article

(This article belongs to the Proceedings of Proceedings of Eurosensors 2017, Paris, France, 3–6 September 2017)

► Show Figures

Figure 1

4 pages, 843 KiB

Open AccessProceeding Paper

Inkjet 3D Printed Miniature Water Turbine Energy Harvester-Flow Meter for Distributed Measurement Systems

by Krzysztof Adamski, Jarosław Adamski, Jan A. Dziuban and Rafał Walczak

Proceedings 2017, 1(4), 578; https://doi.org/10.3390/proceedings1040578 - 8 Aug 2017

Viewed by 2716

Abstract

An energy harvester fabricated by inkjet 3D printing based on miniature water flow turbine with mechanical and electrical components necessary for electrical energy generation is shown. Turbine (outside diameter 25.4 mm (1”) and 14 mm length) is able to generate electric power of [...] Read more.

An energy harvester fabricated by inkjet 3D printing based on miniature water flow turbine with mechanical and electrical components necessary for electrical energy generation is shown. Turbine (outside diameter 25.4 mm (1”) and 14 mm length) is able to generate electric power of 4 mW for 14 L/min of water flow and it gives 0.7 V for optimal load resistance (R_L = 55 Ω). The harvester itself may be used as self-suppling water-flow, zero-energetic sensor in the distributed nets of water consumption measurement. Full article

(This article belongs to the Proceedings of Proceedings of Eurosensors 2017, Paris, France, 3–6 September 2017)

► Show Figures

Figure 1

5 pages, 653 KiB

Open AccessProceeding Paper

Fabrication Methods for High-Performance Miniature Disks of Terfenol-D for Energy Harvesting

by Valentin Issindou, B. Viala, L. Gimeno, O. Cugat, C. Rado and S. Bouat

Proceedings 2017, 1(4), 579; https://doi.org/10.3390/proceedings1040579 - 8 Aug 2017

Viewed by 2133

Abstract

In this paper, we compare different techniques to manufacture high-performance miniature disks of Terfenol-D aiming at self-powered IoT sensors. To reach large in-plane magnetostriction while maintaining low driving field, microstructure engineering is essential. This work covers monocrystalline, polycrystalline and hot-pressed powder materials whose [...] Read more.

In this paper, we compare different techniques to manufacture high-performance miniature disks of Terfenol-D aiming at self-powered IoT sensors. To reach large in-plane magnetostriction while maintaining low driving field, microstructure engineering is essential. This work covers monocrystalline, polycrystalline and hot-pressed powder materials whose performances are analyzed. A “performance phase diagram per technique” is reported at the end. Full article

(This article belongs to the Proceedings of Proceedings of Eurosensors 2017, Paris, France, 3–6 September 2017)

► Show Figures

Figure 1

4 pages, 592 KiB

Open AccessProceeding Paper

3D Printed Materials Based Triboelectric Device for Energy Harvesting and Sensing

by Rubaiyet I. Haque, Pierre-André Farine and Danick Briand

Proceedings 2017, 1(4), 580; https://doi.org/10.3390/proceedings1040580 - 16 Aug 2017

Cited by 8 | Viewed by 2689

Abstract

Energy harvesting and sensing triboelectric module based on 3D-printed materials have been developed. Rapid prototyping, 3D-printing method is used to prepare sheets of triboelectric materials and simple film casting technique is employed to deposit electrically conductive carbon based elastomeric composite on these dielectrics. [...] Read more.

Energy harvesting and sensing triboelectric module based on 3D-printed materials have been developed. Rapid prototyping, 3D-printing method is used to prepare sheets of triboelectric materials and simple film casting technique is employed to deposit electrically conductive carbon based elastomeric composite on these dielectrics. The device exhibits capability to detect and harvest energy from mechanical deformation. The developed 3D printed triboelectric system, under tapping condition, provides the maximum rms power of 41.2 μW for the optimum load resistance of 6.1 MΩ that corresponds to the power density of 10.6 μW/cm². The processing set the building-block towards fully printed triboelectric devices. Full article

(This article belongs to the Proceedings of Proceedings of Eurosensors 2017, Paris, France, 3–6 September 2017)

► Show Figures

Figure 1

4 pages, 572 KiB

Open AccessProceeding Paper

A Nonlinear Energy Harvesting with Asymmetry Compensation

by Bruno Andò, Salvatore Baglio, Vincenzo Marletta, Antonio Pistorio and Adi R. Bulsara

Proceedings 2017, 1(4), 581; https://doi.org/10.3390/proceedings1040581 - 8 Aug 2017

Cited by 3 | Viewed by 2011

Abstract

A Nonlinear Energy Harvester designed to scavenge energy from wide-band mechanical vibrations is presented. The harvester exploits the advantages of a flexible beam in a Snap-Through-Buckling configuration and a novel magnetic repulsion mechanism to compensate for the asymmetric behavior of the device, in [...] Read more.

A Nonlinear Energy Harvester designed to scavenge energy from wide-band mechanical vibrations is presented. The harvester exploits the advantages of a flexible beam in a Snap-Through-Buckling configuration and a novel magnetic repulsion mechanism to compensate for the asymmetric behavior of the device, in the vertical direction, due to the effect of the proof mass load. The device is demonstrated to be capable of scavenging energy in the range 0.5–10 Hz, which is compatible with many vibration sources, and to generate power up to 120 µW in case of an impulsive input at 5 Hz. Full article

(This article belongs to the Proceedings of Proceedings of Eurosensors 2017, Paris, France, 3–6 September 2017)

► Show Figures

Figure 1

4 pages, 1551 KiB

Open AccessProceeding Paper

A MEMS EVEH-Assisted Long-Range RFID Tag System for Applications with Low-Frequency Vibrations

by Yingxian Lu, Frédéric Marty, Dimitri Galayko, Jean-Marc Laheurte and Philippe Basset

Proceedings 2017, 1(4), 582; https://doi.org/10.3390/proceedings1040582 - 18 Aug 2017

Cited by 2 | Viewed by 2090

Abstract

We report an energy-autonomous Radio Frequency IDentification (RFID) tag system which is powered by an electrostatic MEMS-based Vibration Energy Harvester (e-VEH). The VEH is designed specifically for the vibrations of low frequency around 10 Hz. An energy of 80 nJ/cycle can be delivered [...] Read more.

We report an energy-autonomous Radio Frequency IDentification (RFID) tag system which is powered by an electrostatic MEMS-based Vibration Energy Harvester (e-VEH). The VEH is designed specifically for the vibrations of low frequency around 10 Hz. An energy of 80 nJ/cycle can be delivered when the VEH is loaded with an optimal resistor and a bias of 20 V. An RFID chip is powered by the current released from a 1-μF capacitor, which is charged by the VEH through a diode rectifier. The read range of the tag is increased from 2.5 m (under batteryless mode) to 15 m when powered by the VEH working with an acceleration of 2 g_rms and 10 Hz. The energy of the VEH stored in the capacitor within 40 s can sustain up to 3 tag readings. Full article

(This article belongs to the Proceedings of Proceedings of Eurosensors 2017, Paris, France, 3–6 September 2017)

► Show Figures

Figure 1

5 pages, 772 KiB

Open AccessProceeding Paper

RF Harvesting Circuit for Batteryless Connected Sensor

by Ahcine Safraou, Patrick Bacot, Stéphane Dudret, Emmanuelle Bourdel and Bertrand Granado

Proceedings 2017, 1(4), 583; https://doi.org/10.3390/proceedings1040583 - 9 Aug 2017

Cited by 1 | Viewed by 2078

Abstract

The goal of our work is to optimise the supply chain management of industrial assets with UHF RFID system. This allows simple identification. In this work, we try to go further and enrich the identification information with information about the conditions of the [...] Read more.

The goal of our work is to optimise the supply chain management of industrial assets with UHF RFID system. This allows simple identification. In this work, we try to go further and enrich the identification information with information about the conditions of the connected assets. To avoid any maintenance operation, we realise an energy harvesting circuit to provide the needed energy to the connected sensor. In this paper, we present the conception of an autonomous connected sensor, which works in UHF RFID band. We set up the global architecture of the measurement system and we focus mainly on the energy supplier circuit and its improvement. Full article

(This article belongs to the Proceedings of Proceedings of Eurosensors 2017, Paris, France, 3–6 September 2017)

► Show Figures

Figure 1

4 pages, 685 KiB

Open AccessProceeding Paper

Bulk PZT Cantilever Based MEMS Acoustic Transducer for Cochlear Implant Applications

by Aziz Koyuncuoğlu, Bedirhan İlik, Salar Chamanian, Hasan Uluşan, Parinaz Ashrafi, Dilek Işık and Haluk Külah

Proceedings 2017, 1(4), 584; https://doi.org/10.3390/proceedings1040584 - 11 Aug 2017

Cited by 11 | Viewed by 3656

Abstract

This paper presents the first acoustic experimental results of a MEMS based bulk piezoelectric transducer for use in fully implantable cochlear implants (FICI). For this purpose, the transducer was attached onto an acoustically vibrating membrane. Sensing and energy harvesting performances were measured using [...] Read more.

This paper presents the first acoustic experimental results of a MEMS based bulk piezoelectric transducer for use in fully implantable cochlear implants (FICI). For this purpose, the transducer was attached onto an acoustically vibrating membrane. Sensing and energy harvesting performances were measured using neural stimulation and rectifier circuits, respectively. The chip has a 150 Hz bandwidth around 1800 Hz resonance frequency that is suitable for mechanical filtering as a sensor. As an energy harvester, bulk piezoelectric transducer generated a rectified power of 16.25 μW with 2.47 V_DC with 120 dB-A sound input at 1780 Hz. Among other MEMS acoustic energy harvesters in the literature, reported transducer has the highest power density (1.5 × 10⁻³ W/cm³) to our knowledge. Full article

(This article belongs to the Proceedings of Proceedings of Eurosensors 2017, Paris, France, 3–6 September 2017)

► Show Figures

Figure 1

5 pages, 999 KiB

Open AccessProceeding Paper

Energy Estimation for Electret Harvester with Nonlinear Spring

by K. Yamamoto, T. Fujita, A. Badel, F. Formosa, K. Kanda and K. Maenaka

Proceedings 2017, 1(4), 585; https://doi.org/10.3390/proceedings1040585 - 7 Aug 2017

Cited by 3 | Viewed by 1740

Abstract

A design of an electret-type vibration energy harvester using non-linear springs is described. The use of bi-stable springs enabling a snap-through behavior is a well-known technique known for improving the low-frequency performances of energy harvesters. The electrical power from our bi-stable energy harvester [...] Read more.

A design of an electret-type vibration energy harvester using non-linear springs is described. The use of bi-stable springs enabling a snap-through behavior is a well-known technique known for improving the low-frequency performances of energy harvesters. The electrical power from our bi-stable energy harvester concept is estimated using a numerical computing tool and an electrical equivalent circuit model. We conclude that our bi-stable spring harvester concept obtains larger power at lower frequencies compared to a similar linear design. Full article

(This article belongs to the Proceedings of Proceedings of Eurosensors 2017, Paris, France, 3–6 September 2017)

► Show Figures

Figure 1

4 pages, 505 KiB

Open AccessProceeding Paper

Design and Optimization of Wideband Multimode Piezoelectric MEMS Vibration Energy Harvesters

by Seyedfakhreddin Nabavi and Lihong Zhang

Proceedings 2017, 1(4), 586; https://doi.org/10.3390/proceedings1040586 - 4 Aug 2017

Cited by 19 | Viewed by 2591

Abstract

To enlarge operating frequency bandwidth of the multimode energy harvesters, nonlinearity characteristics has to be well presented by the system configuration. Therefore, the conventional optimization techniques, which are solely based on human observation, are highly difficult and somehow impossible. In this paper we [...] Read more.

To enlarge operating frequency bandwidth of the multimode energy harvesters, nonlinearity characteristics has to be well presented by the system configuration. Therefore, the conventional optimization techniques, which are solely based on human observation, are highly difficult and somehow impossible. In this paper we propose an efficient optimization technique for automating the design of nonlinear piezoelectric MEMS energy harvesters based on Genetic Algorithm (GA) with minimum human efforts. In this regard, a MEMS piezoelectric harvester with capability of operating at multimode is proposed and a GA-based optimization methodology is utilized to shift its operational modes close to each other by optimizing device physical aspects. The experiments on post-optimization resonant frequencies show that our proposed optimization methodology is able to reduce the resonant frequencies by 13%, 10% and 9.5% for the first, second and third modes, respectively. In addition, the numerical simulation shows that our optimized energy harvester with a total chip area of 16-mm² is able to maximally generate 655 mV, 80 mV and 572 mV at the first (153 Hz), second (168 Hz) and third (219 Hz) modes, respectively under 1 g vibration. Full article

(This article belongs to the Proceedings of Proceedings of Eurosensors 2017, Paris, France, 3–6 September 2017)

► Show Figures

Figure 1

4 pages, 1578 KiB

Open AccessProceeding Paper

High Sensitivity Piezogenerator Based on GaN Nanowires

by L. Lu, N. Jamond, E. Lefeuvre, P. Chrétien, F. Houzé, L. Travers, J. C. Harmand, F. Glas, N. Gogneau, F. H. Julien and M. Tchernycheva

Proceedings 2017, 1(4), 587; https://doi.org/10.3390/proceedings1040587 - 7 Aug 2017

Viewed by 1926

Abstract

We report on a prototype of piezogenerator based on vertically-aligned GaN nanowires grown by Plasma-Assisted Molecule Beam Epitaxy (PAMBE). Our device generates a peak-to-peak voltage from 20 mV to 60 mV depending on the applied force. The output power density reaches 0.76 mW/cm [...] Read more.

We report on a prototype of piezogenerator based on vertically-aligned GaN nanowires grown by Plasma-Assisted Molecule Beam Epitaxy (PAMBE). Our device generates a peak-to-peak voltage from 20 mV to 60 mV depending on the applied force. The output power density reaches 0.76 mW/cm³ which is of the same order of magnitude as the state-of-art value. Furthermore, the pressure applied to deform the nanowires is of the order of kPa, much less than that used in previous reports (which were of the order of MPa) utilizing ZnO nanowires for the power generation. Thus, an enhanced mechanic-electrical conversion efficiency has been achieved. Our GaN nanowire based devices are promising both for pressure sensing applications and for mechanic energy harvesting. Full article

(This article belongs to the Proceedings of Proceedings of Eurosensors 2017, Paris, France, 3–6 September 2017)

► Show Figures

Figure 1

5 pages, 2185 KiB

Open AccessProceeding Paper

Development of a Compact, Low-Frequency Vibration, Piezoelectric MEMS Energy Harvester

by Florenta Costache, Boscij Pawlik and Andreas Rieck

Proceedings 2017, 1(4), 588; https://doi.org/10.3390/proceedings1040588 - 8 Aug 2017

Cited by 7 | Viewed by 2450

Abstract

This paper presents the design and fabrication of a piezoelectric MEMS cantilever harvester of optimized shape able to generate a usable amount of power from low frequency vibrations for moderate cantilever deflection. The corresponding harvester design, obtained by means of FEM simulations, comprises [...] Read more.

This paper presents the design and fabrication of a piezoelectric MEMS cantilever harvester of optimized shape able to generate a usable amount of power from low frequency vibrations for moderate cantilever deflection. The corresponding harvester design, obtained by means of FEM simulations, comprises a trapezoidal unimorph silicon cantilever beam with a piezoelectric PZT film and a rectangular silicon tip mass. This device was fabricated by wafer-level micro-fabrication processes. The harvester provided 2 μW generated power at 123 Hz resonant frequency. Full article

(This article belongs to the Proceedings of Proceedings of Eurosensors 2017, Paris, France, 3–6 September 2017)

► Show Figures

Figure 1

4 pages, 1264 KiB

Open AccessProceeding Paper

Low Cost Optical Electronic Nose for Biomedical Applications

by Siavash Esfahani and James A. Covington

Proceedings 2017, 1(4), 589; https://doi.org/10.3390/proceedings1040589 - 16 Aug 2017

Cited by 9 | Viewed by 3924

Abstract

Here we report on the development of a Non-Dispersive Infrared Sensor (NDIR) optical electronic nose, which we intend to target towards healthcare applications. Our innovative electronic nose uses an array of four different tuneable infra-red detectors to analyse the gas/volatile content of a [...] Read more.

Here we report on the development of a Non-Dispersive Infrared Sensor (NDIR) optical electronic nose, which we intend to target towards healthcare applications. Our innovative electronic nose uses an array of four different tuneable infra-red detectors to analyse the gas/volatile content of a sample under test. The instrument has the facility to scan a range of wavelengths from 3.1 μm and 10.5 μm with a step size of 20 nm. The use of a tuneable filter, instead of expensive lasers, reduces the overall cost of the system. We have tested our instrument to a range of gases and vapours and our electronic nose is able to detect, for example, methane down to single figure ppm at two different wavelengths. It is also able to discriminate between complex odours, here we present the results from 6 different chemicals. In this case, fixed frequency measurements were used as “virtual sensors” and their output then analysed by (PCA), which for all but one case, showed good separation. Full article

(This article belongs to the Proceedings of Proceedings of Eurosensors 2017, Paris, France, 3–6 September 2017)

► Show Figures

Figure 1

4 pages, 1221 KiB

Open AccessProceeding Paper

Detection of Self-Mixing Interferometric Fringes of a Laser Sensor Using Matched Filter

by Muhammad Akmal, Usman Zabit, Olivier D. Bernal and Thierry Bosch

Proceedings 2017, 1(4), 590; https://doi.org/10.3390/proceedings1040590 - 18 Aug 2017

Viewed by 2094

Abstract

Self-Mixing (SM) is a promising technique for sensing vibration, distance, velocity etc. To retrieve accurate metric measurements from an acquired SM signal, it is necessary to correctly detect all interferometric fringes. Traditionally, SM fringes are detected by a derivative based threshold (DBT) scheme. [...] Read more.

Self-Mixing (SM) is a promising technique for sensing vibration, distance, velocity etc. To retrieve accurate metric measurements from an acquired SM signal, it is necessary to correctly detect all interferometric fringes. Traditionally, SM fringes are detected by a derivative based threshold (DBT) scheme. However, such a scheme gives correct results only for SM signals with high signal-to-noise ratio (SNR) and moderate optical feedback regime. So, in this paper, a better fringe detection method, based on Matched Filter (MF), is proposed which has provided correct SM fringe detection even in case of low SNR and weak optical feedback regime. The proposed approach has resulted in fringe detection accuracy of 100% for a low SNR SM signal belonging to the weak feedback regime. Full article

(This article belongs to the Proceedings of Proceedings of Eurosensors 2017, Paris, France, 3–6 September 2017)

► Show Figures

Figure 1

4 pages, 508 KiB

Open AccessProceeding Paper

RFID Integration into a Low Power Sensor Platform

by Karlheinz Kellner and Martin Brandl

Proceedings 2017, 1(4), 591; https://doi.org/10.3390/proceedings1040591 - 29 Aug 2017

Viewed by 2193

Abstract

Beyond identification purposes, RFID (Radio Frequency Identification) is an elegant way to transmit wireless sensor data. There are several RFID transponder ICs on the market, but for the data read out of the sensors, a low power microcontroller (µC) with a specific functionality [...] Read more.

Beyond identification purposes, RFID (Radio Frequency Identification) is an elegant way to transmit wireless sensor data. There are several RFID transponder ICs on the market, but for the data read out of the sensors, a low power microcontroller (µC) with a specific functionality is also often a necessary part of the system. So we present an easy way to integrate the functionality of the RFID transponder directly into the microcontroller. This reduces costs and minimizes the PCB footprint. In particular, an implementation of an RFID tag, compatible with ISO/IEC 14443-2, Type B, into a commercial low power µC is demonstrated. Full article

(This article belongs to the Proceedings of Proceedings of Eurosensors 2017, Paris, France, 3–6 September 2017)

► Show Figures

Figure 1

4 pages, 1064 KiB

Open AccessProceeding Paper

Linear Integrated Interface for Automatic Differential Capacitive Sensing

by Gianluca Barile, Giuseppe Ferri, Francesca Romana Parente, Vincenzo Stornelli, Alessandro Depari, Alessandra Flammini and Emiliano Sisinni

Proceedings 2017, 1(4), 592; https://doi.org/10.3390/proceedings1040592 - 29 Aug 2017

Cited by 2 | Viewed by 2079

Abstract

In this work, the authors introduce a new full-analog front-end for differential capacitance sensors which provides a DC output voltage, directly proportional to the measurand variations. The readout circuit architecture is based on a De Sauty bridge as core of the capacitive sensing [...] Read more.

In this work, the authors introduce a new full-analog front-end for differential capacitance sensors which provides a DC output voltage, directly proportional to the measurand variations. The readout circuit architecture is based on a De Sauty bridge as core of the capacitive sensing whereas the feedback circuitry performs the bridge autobalancing operation by means of changes in a multiplier output. The circuit is designed in a standard CMOS technology (AMS 0.35 µm) so is suitable for portable systems. Simulated results have shown a good agreement with the theoretical model being the percentage relative error less than 2.5%. Interface sensitivity is constant and values around 0.055 V/mm for the considered application. Full article

(This article belongs to the Proceedings of Proceedings of Eurosensors 2017, Paris, France, 3–6 September 2017)

► Show Figures

Figure 1

5 pages, 817 KiB

Open AccessProceeding Paper

Dual Mode Pressure Sensing for Lower-Limb Prosthetic Interface

by Maurizio Rossi, Matteo Nardello, Leandro Lorenzelli and Davide Brunelli

Proceedings 2017, 1(4), 593; https://doi.org/10.3390/proceedings1040593 - 22 Aug 2017

Cited by 3 | Viewed by 3100

Abstract

We present an electronic sensory system capable of measuring both dynamic and static normal pressure to monitor the pain and stress felt by amputees on contact points between residual limb and prosthesis’ sockets. Monitoring the contact forces is crucial to ease the prosthesis [...] Read more.

We present an electronic sensory system capable of measuring both dynamic and static normal pressure to monitor the pain and stress felt by amputees on contact points between residual limb and prosthesis’ sockets. Monitoring the contact forces is crucial to ease the prosthesis customization process and to reduce the pain for the final user. We propose a novel design of a sensing unit that exploits jointly piezoelectric and piezoresistive materials to detect and to discriminate dynamic and static stimuli, and a digitally controlled amplification circuit that permits the signal acquisition from both kind of transducers with low cost microcontroller. Results demonstrate that our design provides valuable information at 1 ksps rate with a global power consumption lower than 25 mW. Full article

(This article belongs to the Proceedings of Proceedings of Eurosensors 2017, Paris, France, 3–6 September 2017)

► Show Figures

Figure 1

4 pages, 644 KiB

Open AccessProceeding Paper

Selective Gas Detection by a Single MOX-Sensor

by Aleksei Shaposhnik, Pavel Moskalev, Alexey Zviagin, Kristina Chegereva, Stanislav Ryabtsev, Alexey Vasiliev and Polina Shaposhnik

Proceedings 2017, 1(4), 594; https://doi.org/10.3390/proceedings1040594 - 25 Aug 2017

Cited by 1 | Viewed by 1704

Abstract

Selective analysis of CO gas, hydrogen and hydrogen sulfide was carried out using single metal oxide sensor. Non-stationary sensor heating mode allowed discovering individual peculiarities of each gas in question. Resistance vs. time curves were converted into multidimensional data arrays and processed by [...] Read more.

Selective analysis of CO gas, hydrogen and hydrogen sulfide was carried out using single metal oxide sensor. Non-stationary sensor heating mode allowed discovering individual peculiarities of each gas in question. Resistance vs. time curves were converted into multidimensional data arrays and processed by chemometrics methods; as a result, qualitative and quantitative analysis of single-component gas systems was successfully carried out. Full article

(This article belongs to the Proceedings of Proceedings of Eurosensors 2017, Paris, France, 3–6 September 2017)

► Show Figures

Figure 1

4 pages, 341 KiB

Open AccessProceeding Paper

Development of Calorie Tracking Algorithm for Children and Comparison with Commercialized Product

by Yongwon Jang, Dae-Sik Lee and Seunghwan Kim

Proceedings 2017, 1(4), 595; https://doi.org/10.3390/proceedings1040595 - 17 Aug 2017

Viewed by 2191

Abstract

In this study, we developed an appropriate calorie tracking algorithm for children and compared it with the current commercial product. The results of the developed algorithm showed 94.2% accuracy in the classification of intermittent activities: sitting down, standing up, turning around and jumping; [...] Read more.

In this study, we developed an appropriate calorie tracking algorithm for children and compared it with the current commercial product. The results of the developed algorithm showed 94.2% accuracy in the classification of intermittent activities: sitting down, standing up, turning around and jumping; and 92.9% accuracy in the classification of continuous activities: walking, running, stair climbing, and jumping rope. This comparison shows that the developed algorithm outperforms the commercialized one and shows it is suitable for actual use of children. This study provides new activity monitor algorithm for children’s self-management. Full article

(This article belongs to the Proceedings of Proceedings of Eurosensors 2017, Paris, France, 3–6 September 2017)

► Show Figures

Figure 1

4 pages, 624 KiB

Open AccessProceeding Paper

Digital Multi-Probe Temperature Monitoring System for Long-Term on Field Measurements

by Leonardo Pantoli, Mirco Muttillo, Tullio De Rubeis, Iole Nardi, Vincenzo Stornelli and Giuseppe Ferri

Proceedings 2017, 1(4), 596; https://doi.org/10.3390/proceedings1040596 - 11 Aug 2017

Cited by 2 | Viewed by 1888

Abstract

In this work, we present a flexible and multi-probe temperature measurement system, suitable for real time monitoring and long-term applications. The proposed sensor system allows to investigate the thermal performance of different environments such as building areas, walls or external places. The equipment [...] Read more.

In this work, we present a flexible and multi-probe temperature measurement system, suitable for real time monitoring and long-term applications. The proposed sensor system allows to investigate the thermal performance of different environments such as building areas, walls or external places. The equipment has been characterized both at device and system levels and validated through experimental tests through a comparison with different sensors. The conceived system consists of a control unit with a microcontroller, a user interface and an internal recording section for data storage and management, and digital temperature sensors with a 12-bit resolution, whose number can be freely defined, having the system a modular architecture. The low-cost and open-source characteristics, beyond of its flexibility and capability to manage several sensors placed also very far from the control unit (up to 500 m), make the proposed solution a suitable candidate to be used for practical applications that require on-field measurements. Full article

(This article belongs to the Proceedings of Proceedings of Eurosensors 2017, Paris, France, 3–6 September 2017)

► Show Figures

Figure 1

5 pages, 395 KiB

Open AccessProceeding Paper

Chili Pepper Scent: Study and Recognition with Chemiresistors Array

by Ettore Massera, Veronica Sberveglieri, Estefania Núñez-Carmona, Saverio De Vito, Vardan Galstyan, Dario Zappa, Maria Lucia Miglietta, Brigida Alfano and Girolamo Di Francia

Proceedings 2017, 1(4), 597; https://doi.org/10.3390/proceedings1040597 - 15 Aug 2017

Viewed by 2095

Abstract

Chili peppers are spices worldwide appreciated and represent a real culinary tradition and cultural identity for several populations. Here we present an effort to evaluate whether an array of chemiresistor gas sensors is capable to distinguish different chili pepper samples by the analysis [...] Read more.

Chili peppers are spices worldwide appreciated and represent a real culinary tradition and cultural identity for several populations. Here we present an effort to evaluate whether an array of chemiresistor gas sensors is capable to distinguish different chili pepper samples by the analysis of the emitted aroma. Our approach is based on two methods. A classical method based on GC-MS-SPME to characterize intensity and composition of chemical compounds emitted by the fruits and a novel approach on Multivariate sensors response that produces an online graphic representation of the sensor features. Full article

(This article belongs to the Proceedings of Proceedings of Eurosensors 2017, Paris, France, 3–6 September 2017)

► Show Figures

Figure 1

4 pages, 866 KiB

Open AccessProceeding Paper

Thermal Noise Limited, Scalable Multi-Piezoresistor Readout Architecture

by János Radó, Gábor Battistig, Andrea Edit Pap, Péter Fürjes and Péter Földesy

Proceedings 2017, 1(4), 598; https://doi.org/10.3390/proceedings1040598 - 11 Aug 2017

Cited by 2 | Viewed by 1871

Abstract

In this work we present a low noise, hardware efficient, and scalable read-out architecture for piezoresistive mechanical transducers containing multiple sensing elements. To reach the thermal noise limit the sensing elements are driven by modulated, differential stimuli at separated frequencies, their current are [...] Read more.

In this work we present a low noise, hardware efficient, and scalable read-out architecture for piezoresistive mechanical transducers containing multiple sensing elements. To reach the thermal noise limit the sensing elements are driven by modulated, differential stimuli at separated frequencies, their current are summed and digitalized for signal processing and response extraction. The solution decreases the complexity of the analog read-out electronics and makes it easily scalable. Besides the improved signal-to-noise ratio the principle can achieve minimised power consumption and self-heating of piezoresistors with minimal analogue hardware resources. The distinguishing features of the arrangement are the multiple frequency modulation, the current based multiple sensor integration, one AD converter, no analog multiplexing, and the need for only a half Wheatstone bridge per sensing element. Full article

(This article belongs to the Proceedings of Proceedings of Eurosensors 2017, Paris, France, 3–6 September 2017)

► Show Figures

Figure 1

5 pages, 636 KiB

Open AccessProceeding Paper

Laparoscopy’s Gestures Assessment: A Construct Study for the Validation of an Instrumented Glove

by Gaelle Thomas, Juan Diego Lemos, Georges Soto-Romero, Jean-Yves Fourniols and Alher Mauricio Hernández

Proceedings 2017, 1(4), 599; https://doi.org/10.3390/proceedings1040599 - 11 Aug 2017

Cited by 2 | Viewed by 2012

Abstract

The GIBIC research team, from UdeA, and S4M from LAAS-CNRS, designed a glove with inertial sensors (IMU) for quantifying surgeons’ dexterity. A previous study validated its capacity to accurately rank participants, compared to a video evaluation, during neurosurgery training. The objective of this [...] Read more.

The GIBIC research team, from UdeA, and S4M from LAAS-CNRS, designed a glove with inertial sensors (IMU) for quantifying surgeons’ dexterity. A previous study validated its capacity to accurately rank participants, compared to a video evaluation, during neurosurgery training. The objective of this work is to check this validity for laparoscopic surgery, compared with a “gold-standard” simulator, the LapSim (Surgical Science^®). For this purpose, the inertial basic data of the sensors were processed into quantified score comparable with the LapSim scores. A trial was designed and conducted during one month with nine students training on specific LapSim tasks. Full article

(This article belongs to the Proceedings of Proceedings of Eurosensors 2017, Paris, France, 3–6 September 2017)

► Show Figures

Figure 1

4 pages, 742 KiB

Open AccessProceeding Paper

Embedded Wearable Integrating Real-Time Processing of Electromyography Signals

by Paolo Gentile, Marco Pessione, Antonio Suppa, Alessandro Zampogna and Fernanda Irrera

Proceedings 2017, 1(4), 600; https://doi.org/10.3390/proceedings1040600 - 9 Aug 2017

Cited by 7 | Viewed by 2475

Abstract

We realized a non-invasive wearable device able to record muscle activity using patch electrodes positioned on the skin over the muscle. It is an integrated system-on-board developed for the detection of several physical and physiologic human parameters which includes specific circuits for detecting [...] Read more.

We realized a non-invasive wearable device able to record muscle activity using patch electrodes positioned on the skin over the muscle. It is an integrated system-on-board developed for the detection of several physical and physiologic human parameters which includes specific circuits for detecting the surface electromyography signal and algorithms for the real-time data processing optimized to low computational load. In real time, the proposed system dissipates only 26 mW and guarantees 20 h battery autonomy. The system exhibits performance comparable with those achieved with state-of-art wired equipment used in the hospitals, but with the advantage of being an embedded wearable wireless device. Full article

(This article belongs to the Proceedings of Proceedings of Eurosensors 2017, Paris, France, 3–6 September 2017)

► Show Figures

Figure 1

5 pages, 1796 KiB

Open AccessProceeding Paper

A Dedicated Gas Analysis System Based on Resonant MEMS Sensors for Detection of Illicit Substances in Cargo Containers

by Maira Possas, Lionel Rousseau, Farbod Ghassemi, Pedro González Losada, Julien Pagazani, Gaëlle Lissorgues, Massiel Habchi and Emmanuel Scorsone

Proceedings 2017, 1(4), 601; https://doi.org/10.3390/proceedings1040601 - 8 Aug 2017

Viewed by 2129

Abstract

In this work, a dedicated gas analysis system has been designed to interface resonant micro-cantilever sensors for the detection of illicit substances for the inspection of container and large-volumes freight. In a previous work, we have fabricated diamond micro-cantilever sensors which have been [...] Read more.

In this work, a dedicated gas analysis system has been designed to interface resonant micro-cantilever sensors for the detection of illicit substances for the inspection of container and large-volumes freight. In a previous work, we have fabricated diamond micro-cantilever sensors which have been coated with a sensitive layer. A gas analysis cell was developed to hold 8 sensors and allow them to be easily changed. A dedicated electronic read-out circuit provides low-noise detection of all sensors output signal. To complement this existing technology, we are designing a new system to accurately tune temperature and flow parameters of the analyzed gas. In parallel, micro-cantilever sensors have been optimized to increase sensor and gauge sensitivities. Full article

(This article belongs to the Proceedings of Proceedings of Eurosensors 2017, Paris, France, 3–6 September 2017)

► Show Figures

Figure 1

5 pages, 1437 KiB

Open AccessProceeding Paper

Cooperative Air Quality Sensing with Crowdfunded Mobile Chemical Multisensor Devices

by Annalisa Agresta, Saverio De Vito, Fabrizio Formisano, Ettore Massera, Elena Esposito, Maria Salvato, Grazia Fattoruso and Girolamo Di Francia

Proceedings 2017, 1(4), 602; https://doi.org/10.3390/proceedings1040602 - 24 Aug 2017

Viewed by 1836

Abstract

In this work, we describe a cooperative air quality sensor architecture based on crowdfunded, mobile, electrochemical sensor based, monitoring systems. The platform aims to produce enhanced information on personal pollutant exposure and enable cooperative reconstruction of high resolution pictures of air pollution in [...] Read more.

In this work, we describe a cooperative air quality sensor architecture based on crowdfunded, mobile, electrochemical sensor based, monitoring systems. The platform aims to produce enhanced information on personal pollutant exposure and enable cooperative reconstruction of high resolution pictures of air pollution in the urban landscape. The calibrated devices are connected to smartphones that provide georeferenced visualization of personal exposure and session based log capabilities. A cloud based interface provides a sensor fusion based mapping capability exploiting google maps APIs. An in-lab calibration by linear regression with temperature correction has been computed and preliminary results have been reported. A small set of calibrated devices will be shipped to crowdfunders for extended field tests in different italian cities. Full article

(This article belongs to the Proceedings of Proceedings of Eurosensors 2017, Paris, France, 3–6 September 2017)

► Show Figures

Figure 1

4 pages, 801 KiB

Open AccessProceeding Paper

Plug-and-Play Electronic Unit for MOS and Thermocatalytic Gas Sensors

by Alexey Vasiliev, Sergey Merzlikin, Ilia Shakhnovich, Andrey Sokolov, Oleg Shulgin and Pavel Agafonov

Proceedings 2017, 1(4), 603; https://doi.org/10.3390/proceedings1040603 - 22 Aug 2017

Viewed by 1962

Abstract

The electronic plug-and-play electronic unit for controlling the semiconductor and thermocatalytic sensors is described. This is a controller with standard UART interface, which maintain preset working temperature of the sensor, measures resistance of the sensing layer, makes linearization of the sensitivity curve, compensates [...] Read more.

The electronic plug-and-play electronic unit for controlling the semiconductor and thermocatalytic sensors is described. This is a controller with standard UART interface, which maintain preset working temperature of the sensor, measures resistance of the sensing layer, makes linearization of the sensitivity curve, compensates ambient humidity. In the case of thermocatalytic sensor, it measures power necessary to heat sensing and reference elements of the sensor, and the difference in these two values of power is proportional to the gas concentration. The digital output signal contains information about gas concentration, working parameters of the sensor, sensor type, enabling plug-and-play operation mode. Full article

(This article belongs to the Proceedings of Proceedings of Eurosensors 2017, Paris, France, 3–6 September 2017)

► Show Figures

Figure 1

4 pages, 473 KiB

Open AccessProceeding Paper

Low-Cost Impedance Measurements for Lab-on-a-Chip Architectures: Towards Potentiostat Miniaturization

by Raquel Pruna, Francisco Palacio, Abdoullatif Baraket, Joan Bausells, Abdelhamid Errachid and Manel López

Proceedings 2017, 1(4), 604; https://doi.org/10.3390/proceedings1040604 - 28 Aug 2017

Cited by 2 | Viewed by 2073

Abstract

The development of miniaturized potentiostats capable of measuring in a wide range of conditions and with full characteristics (e.g., wide bandwidth and capacitive/inductive contribution to sensor’s impedance) is still an unresolved challenge in bioelectronics. We present a simple analogue design coupled to a [...] Read more.

The development of miniaturized potentiostats capable of measuring in a wide range of conditions and with full characteristics (e.g., wide bandwidth and capacitive/inductive contribution to sensor’s impedance) is still an unresolved challenge in bioelectronics. We present a simple analogue design coupled to a digital filter based on a lock-in amplifier as an alternative to complex architectures reported hitherto. A low-cost, miniaturized and fully integrated acquisition electronic system was developed, tested for a fully integrated three-lead electrochemical biosensor and benchmarked against a commercial potentiostat. The portable potentiostat was coupled to an array of miniaturized gold working electrodes to perform complex impedance analyses for tumor necrosis factor α (TNF-α) cytokine detection. This wearable potentiostat is very promising for the development of low-cost point-of-care (POC) with low power consumption. Full article

(This article belongs to the Proceedings of Proceedings of Eurosensors 2017, Paris, France, 3–6 September 2017)

► Show Figures

Figure 1

5 pages, 1572 KiB

Open AccessProceeding Paper

Submucosal Exploration of EMG and Physiological Parameters in the Bladder Wall

by Luigi Brancato, Tristan Weydts, Mohammad A. Soebadi, Dirk De Ridder and Robert Puers

Proceedings 2017, 1(4), 605; https://doi.org/10.3390/proceedings1040605 - 18 Aug 2017

Cited by 5 | Viewed by 1931

Abstract

An implantable sensor system has been developed to explore the physiological behaviour of the bladder wall. It consists of a 3-axis digital accelerometer and a pressure sensor on the upper side of a flexible polyimide printed circuit board. On the bottom side, two [...] Read more.

An implantable sensor system has been developed to explore the physiological behaviour of the bladder wall. It consists of a 3-axis digital accelerometer and a pressure sensor on the upper side of a flexible polyimide printed circuit board. On the bottom side, two metallic hooks prevent migration of the device in the bladder wall while simultaneously acting as electrodes to record the electrical activity of the detrusor muscle. The full system is inserted at the interface between the detrusor and the mucosa, preventing exposure of the transducer to the urine. This ensures protection both for inflammation of the inner bladder, and from salts deposition on the device. Three packaging layers have been applied to ensure biocompatibility of the device: Parylene-C, medical epoxy and PDMS. The device was first tested in-vitro for water diffusion. Then, the feasibility of submucosal implant was demonstrated in a cadaver pig bladder, and in-vivo recordings were successfully acquired in a rat. Full article

(This article belongs to the Proceedings of Proceedings of Eurosensors 2017, Paris, France, 3–6 September 2017)

► Show Figures

Figure 1

4 pages, 841 KiB

Open AccessProceeding Paper

Laser-Microstructured Double-Sided Adhesive Tapes for Integration of a Disposable Biochip

by Vanessa Zamora, Sebastian Marx, Norbert Arndt-Staufenbiel, Christian Janeczka, George Havlik, Marco Queisser and Henning Schröder

Proceedings 2017, 1(4), 606; https://doi.org/10.3390/proceedings1040606 - 17 Aug 2017

Cited by 5 | Viewed by 3549

Abstract

Laser-microstructured double-sided biocompatible adhesive tapes as intermediated bonding layers are potential candidates for hybrid integration of a disposable biochip. In the EU-PHOCNOSIS project, such thin adhesive tapes are proposed to integrate the polymer microfluidic system with the optical sensor chip. Three laser-assisted structuring [...] Read more.

Laser-microstructured double-sided biocompatible adhesive tapes as intermediated bonding layers are potential candidates for hybrid integration of a disposable biochip. In the EU-PHOCNOSIS project, such thin adhesive tapes are proposed to integrate the polymer microfluidic system with the optical sensor chip. Three laser-assisted structuring methods are investigated to efficiently transfer microchannel patterns to the adhesive tape at room temperature. The test structure design consists of a single channel with 400 µm wide, 30 mm length and two circular receivers with 2 mm radius. The best structuring results are found by using a UV picosecond laser. Full article

(This article belongs to the Proceedings of Proceedings of Eurosensors 2017, Paris, France, 3–6 September 2017)

► Show Figures

Figure 1

5 pages, 1042 KiB

Open AccessProceeding Paper

Hermetic Cavities Using Gold Wafer Level Thermocompression Bonding

by Samuel Charlot, Patrick Pons, Monique Dilhan, Isabelle Vallet and Sebastiano Brida

Proceedings 2017, 1(4), 607; https://doi.org/10.3390/proceedings1040607 - 24 Aug 2017

Cited by 3 | Viewed by 2174

Abstract

This paper presents the study of gold/gold thermocompression bonding at silicon wafer level. The first samples contains sealing rings and electrical pads, and are characterized on pull, and shear test showing bond strength similar to silicon/glass anodic bonding (10 MPa–80 MPa). A sealed [...] Read more.

This paper presents the study of gold/gold thermocompression bonding at silicon wafer level. The first samples contains sealing rings and electrical pads, and are characterized on pull, and shear test showing bond strength similar to silicon/glass anodic bonding (10 MPa–80 MPa). A sealed cavity and a piezoresistor on a 30 µm-thick silicon membrane are added in the second samples. Helium test, membrane deflection and piezoresistor signal monitoring after aging 14 days at 250 °C confirm the vacuum stability inside the cavity after bonding. Full article

(This article belongs to the Proceedings of Proceedings of Eurosensors 2017, Paris, France, 3–6 September 2017)

► Show Figures

Figure 1

5 pages, 782 KiB

Open AccessProceeding Paper

Printed Sensors for Material Integrated Sensing: Functionalization of Semi-Finished Parts

by Gerrit Dumstorff and Walter Lang

Proceedings 2017, 1(4), 608; https://doi.org/10.3390/proceedings1040608 - 8 Aug 2017

Cited by 2 | Viewed by 1693

Abstract

A new and innovative approach is presented to integrate sensors in materials and set up “smart materials”. Semi-finished parts are functionalized by printed sensors and printed interconnects. These functionalized parts are then further processed to components. This is a new and simple approach [...] Read more.

A new and innovative approach is presented to integrate sensors in materials and set up “smart materials”. Semi-finished parts are functionalized by printed sensors and printed interconnects. These functionalized parts are then further processed to components. This is a new and simple approach to integrate sensors in a material. Two examples of printed sensors and the process of integration are presented. One is a printed sensor on carbon weaves, integrated in carbon fiber reinforced plastic. The other one is a sensor structure printed on an aluminum sheet and integrated during high pressure die casting. Besides the benefits of this technological approach, challenges are focused in the paper as well. Full article

(This article belongs to the Proceedings of Proceedings of Eurosensors 2017, Paris, France, 3–6 September 2017)

► Show Figures

Figure 1

4 pages, 779 KiB

Open AccessProceeding Paper

3DInkPack—Inkjet Printing of Discrete Sensor Packages for Advanced Rapid Prototyping

by Matic Krivec, Ali Roshanghias and Alfred Binder

Proceedings 2017, 1(4), 609; https://doi.org/10.3390/proceedings1040609 - 29 Aug 2017

Viewed by 2784

Abstract

A rapid advanced packaging concept, consisting of inkjet photopolymer printing and Ag nanoparticles printing, was investigated for the construction of a pressure sensor package. Acrylate-type 3D package housing with 7 through-holes was printed with a polyjet printer and the through-vias and connection pads [...] Read more.

A rapid advanced packaging concept, consisting of inkjet photopolymer printing and Ag nanoparticles printing, was investigated for the construction of a pressure sensor package. Acrylate-type 3D package housing with 7 through-holes was printed with a polyjet printer and the through-vias and connection pads were manufactured via Ag glue dispensing and inkjet printing of Ag nanoparticle ink. The flip-chip packaging concept was pursued for the electrical connection between the package and the pressure sensor dye. Full article

(This article belongs to the Proceedings of Proceedings of Eurosensors 2017, Paris, France, 3–6 September 2017)

► Show Figures

Figure 1

4 pages, 959 KiB

Open AccessProceeding Paper

Optical Imaging of Intrinsic Neural Signals and Simultaneous MicroECoG Recording Using Polyimide Implants

by Anita Zátonyi, Zsolt Borhegyi, Dorottya Cserpán, Zoltán Somogyvári, Mohit Srivastava, Zoltán Kisvárday and Zoltán Fekete

Proceedings 2017, 1(4), 610; https://doi.org/10.3390/proceedings1040610 - 29 Aug 2017

Cited by 3 | Viewed by 2363

Abstract

This paper presents the simultaneous use of intrinsic optical signal imaging (iOS) and micro-electrocorticography (μECoG) techniques by introducing a transparent polymer based microelectrode array into the optical recording chamber used in vivo functional mapping experiments in anaesthetized cat. The robustness of its site [...] Read more.

This paper presents the simultaneous use of intrinsic optical signal imaging (iOS) and micro-electrocorticography (μECoG) techniques by introducing a transparent polymer based microelectrode array into the optical recording chamber used in vivo functional mapping experiments in anaesthetized cat. The robustness of its site impedance was proven in electrochemical impedance spectroscopy. To demonstrate the feasibility of the combined optical-electrical recording, we have run several stimulus protocols and measured the evoked optical and electrical responses of the visual cortex. Full article

(This article belongs to the Proceedings of Proceedings of Eurosensors 2017, Paris, France, 3–6 September 2017)

► Show Figures

Figure 1

4 pages, 661 KiB

Open AccessProceeding Paper

A Spray Processed Polymer-Based High Temperature Organic/Metal Thermocouple for Embedding in Organic Coatings of Steel Substrates

by Marcel Knoll, Christina Offenzeller, Bernhard Jakoby and Wolfgang Hilber

Proceedings 2017, 1(4), 611; https://doi.org/10.3390/proceedings1040611 - 28 Aug 2017

Cited by 2 | Viewed by 1894

Abstract

In this work we present the realization of a fully spray processed embedded temperature sensor. The sensing element is a thermocouple made of conductive materials which are high temperature stable polymer based paints with organic or metallic filler particles. The thermocouple is embedded [...] Read more.

In this work we present the realization of a fully spray processed embedded temperature sensor. The sensing element is a thermocouple made of conductive materials which are high temperature stable polymer based paints with organic or metallic filler particles. The thermocouple is embedded in an organic paint layer which shows, besides good high temperature properties up to 250 °C, excellent mechanical and chemical stability. The manufactured thermocouples are tested up to a junction temperature of 250 °C, first without and afterwards with an encapsulation layer. The measured output voltage for a terminal temperature of 25 °C and a junction temperature of 250 °C is in the region of 4.23 mV before and after top coating. Finally, a layer analysis of the encapsulated device is made using a cross-section polish. Full article

(This article belongs to the Proceedings of Proceedings of Eurosensors 2017, Paris, France, 3–6 September 2017)

► Show Figures

Figure 1

4 pages, 677 KiB

Open AccessProceeding Paper

Screen-Printed Interdigital Structure on Flexible RTM6 Substrate

by Maryam Kahali Moghaddam, Martina Hübner and Walter Lang

Proceedings 2017, 1(4), 612; https://doi.org/10.3390/proceedings1040612 - 16 Aug 2017

Cited by 1 | Viewed by 1739

Abstract

Ideally, for non-invasive sensor integration in fiber reinforced composites, sensors should be made of resin or fibers. For the first time, the curing degree of RTM6 resin in Glass Fiber Reinforced Polymer (GFRP) is measured with a sensor made of the identical [...] Read more.

Ideally, for non-invasive sensor integration in fiber reinforced composites, sensors should be made of resin or fibers. For the first time, the curing degree of RTM6 resin in Glass Fiber Reinforced Polymer (GFRP) is measured with a sensor made of the identical resin that reinforces the fibers. Resin Transfer Molding type RTM6 is mixed with a plasticizer to get a thin and flexible substrate. Interdigital Capacitive (IDC) sensor is screen-printed using silver filled epoxy on the flexible RTM6 substrate. The sensor is integrated into GFRP and the curing of the RTM6 resin in glass fiber reinforced polymer composite is measured successfully. Full article

(This article belongs to the Proceedings of Proceedings of Eurosensors 2017, Paris, France, 3–6 September 2017)

► Show Figures

Figure 1

5 pages, 534 KiB

Open AccessProceeding Paper

Improving the Durability of Screen Printed Conductors on Woven Fabrics for E-Textile Applications

by Abiodun Komolafe, Russel Torah, John Tudor and Steve Beeby

Proceedings 2017, 1(4), 613; https://doi.org/10.3390/proceedings1040613 - 16 Aug 2017

Cited by 3 | Viewed by 2434

Abstract

This paper reports the experimental investigation of the durability of screen printed conductor-based strain gauges on four fabrics of different stiffness by examining the change in the electrical resistances during and after bending. Emphasis is placed on improving the durability of the gauges [...] Read more.

This paper reports the experimental investigation of the durability of screen printed conductor-based strain gauges on four fabrics of different stiffness by examining the change in the electrical resistances during and after bending. Emphasis is placed on improving the durability of the gauges for both positive and negative bending e-textile applications. The electrical resistance of the printed gauges is generally shown to degrade faster from positive bending than from negative bending. Compressive strain affects the behaviour of the gauges during bending but gauges perform best when they are close to the neutral axis of the printed fabric. Full article

(This article belongs to the Proceedings of Proceedings of Eurosensors 2017, Paris, France, 3–6 September 2017)

► Show Figures

Figure 1

5 pages, 604 KiB

Open AccessProceeding Paper

Design, Fabrication and Testing of the First 3D-Printed and Wet Metallized z-Axis Accelerometer

by Caterina Credi, Valentina Zega, Roberto Bernasconi, Giacomo Langfelder, Alfredo Cigada, Luca Magagnin, Marinella Levi and Alberto Corigliano

Proceedings 2017, 1(4), 614; https://doi.org/10.3390/proceedings1040614 - 8 Aug 2017

Cited by 2 | Viewed by 2312

Abstract

In this work the design, fabrication and testing of the first 3D-printed and wet metallized capacitive z-axis accelerometer with a volume of 3.4 cm × 8 mm × 2.5 mm is presented. Preliminary results well match the modelling, both in terms of [...] Read more.

In this work the design, fabrication and testing of the first 3D-printed and wet metallized capacitive z-axis accelerometer with a volume of 3.4 cm × 8 mm × 2.5 mm is presented. Preliminary results well match the modelling, both in terms of electromechanical parameters and of measured sensitivity, thus validating the proposed concept and fabrication process. With a spring thickness of 300 µm and a gap size of 200 µm for capacitive read-out, the presented device and the shown results can be considered as the first step toward 3D-printed MEMS (Micro-Electro-Mechanical Systems) inertial sensors. Full article

(This article belongs to the Proceedings of Proceedings of Eurosensors 2017, Paris, France, 3–6 September 2017)

► Show Figures

Figure 1

4 pages, 1558 KiB

Open AccessProceeding Paper

A Flexible Pad-Printed Fluxgate Sensor

by Spyridon Schoinas, Adyl-Michaël El Guamra, Fabien Moreillon and Philippe Passeraub

Proceedings 2017, 1(4), 615; https://doi.org/10.3390/proceedings1040615 - 8 Aug 2017

Cited by 6 | Viewed by 2695

Abstract

A flexible flat micro-Fluxgate sensor with amorphous rectangular core, fabricated using a simple printing technique is presented. All materials were selected to facilitate the fabrication process and to achieve optimal sensor performance. The device’s response to an externally applied magnetic field has been [...] Read more.

A flexible flat micro-Fluxgate sensor with amorphous rectangular core, fabricated using a simple printing technique is presented. All materials were selected to facilitate the fabrication process and to achieve optimal sensor performance. The device’s response to an externally applied magnetic field has been studied. The linear measuring range of the sensor is approximately ±40 μT with a linearity error of <2% FS at 100 kHz excitation frequency, allowing the measurement of the terrestrial magnetic field. Experimental results demonstrate that the behaviour of the fabricated device corresponds to the behaviour of a Fluxgate sensor with high sensitivity. Full article

(This article belongs to the Proceedings of Proceedings of Eurosensors 2017, Paris, France, 3–6 September 2017)

► Show Figures

Figure 1

4 pages, 666 KiB

Open AccessProceeding Paper

Low-Cost Thin and Flexible Screen-Printed Pressure Sensor

by Daniel Gräbner, Marcel Tintelott, Gerrit Dumstorff and Walter Lang

Proceedings 2017, 1(4), 616; https://doi.org/10.3390/proceedings1040616 - 11 Aug 2017

Cited by 9 | Viewed by 3925

Abstract

Commercial pressure sensors are often fabricated using well-established silicon micromachining technologies. The thickness and stiffness of silicon-based sensors make them in most cases unsuitable for the integration into materials and surfaces. We present a flexible pressure sensor fabricated by printing technology. Therefore, an [...] Read more.

Commercial pressure sensors are often fabricated using well-established silicon micromachining technologies. The thickness and stiffness of silicon-based sensors make them in most cases unsuitable for the integration into materials and surfaces. We present a flexible pressure sensor fabricated by printing technology. Therefore, an intrinsically pressure sensitive ink is screen printed on interdigital electrodes on a thin and flexible foil substrate. The sensor shows sufficient sensitivity and is applicable in a wide pressure range from 0 to 2 MPa. The sensor can completely be fabricated using a low-cost screen printing process. It is very thin and flexible, making it possible to be applied on curved surfaces or to be integrated into materials in a minimal invasive way. Full article

(This article belongs to the Proceedings of Proceedings of Eurosensors 2017, Paris, France, 3–6 September 2017)

► Show Figures

Figure 1

5 pages, 282 KiB

Open AccessProceeding Paper

Aerosol/Ink Jet Printing Technology for High-Temperature MEMS Sensors

by Alexey A. Vasiliev, Anton V. Nisan and Nikolay N. Samotaev

Proceedings 2017, 1(4), 617; https://doi.org/10.3390/proceedings1040617 - 18 Aug 2017

Cited by 5 | Viewed by 2882

Abstract

In this work we present the results on the application of additive technology that is aerosol and ink jet technique for the fabrication of high-temperature metal oxide gas sensors. The application of thin (12 μm) alumina membrane, aerosol jet printing of Pt microheater [...] Read more.

In this work we present the results on the application of additive technology that is aerosol and ink jet technique for the fabrication of high-temperature metal oxide gas sensors. The application of thin (12 μm) alumina membrane, aerosol jet printing of Pt microheater (line width 40–60 μm), printed sensing layer made of nanocristalline tin dioxide based material, laser cutting of the membrane enabled the fabrication of full-printed cantilever-shaped high-temperature sensor with optimal power consumption (~80 mW at 450 °C) applicable in wireless instruments for the detection of combustible and toxic gases including methane. Full article

(This article belongs to the Proceedings of Proceedings of Eurosensors 2017, Paris, France, 3–6 September 2017)

► Show Figures

Figure 1

5 pages, 1650 KiB

Open AccessProceeding Paper

Temperature Dependence of Gauge Factor of Printed Piezoresistive Layers Embedded in Organic Coatings

by Pavel Kulha, Herbert Enser, Johannes K. Sell, Bernhard Strauß, Michaela Schatzl-Linder, Bernhard Jakoby and Wolfgang Hilber

Proceedings 2017, 1(4), 618; https://doi.org/10.3390/proceedings1040618 - 9 Aug 2017

Cited by 6 | Viewed by 2022

Abstract

The paper reports on temperature behavior of strain sensitivity of recently introduced screen printing technology facilitating the realization of silver and carbon black piezoresistors embedded in organic coatings. Piezoresistive layers were prepared by screen printing directly on the top of the organic coating. [...] Read more.

The paper reports on temperature behavior of strain sensitivity of recently introduced screen printing technology facilitating the realization of silver and carbon black piezoresistors embedded in organic coatings. Piezoresistive layers were prepared by screen printing directly on the top of the organic coating. Since no glue or carrying substrates are between the sensitive element and the device under test, the coupling factor is high and the strain is efficiently transferred to the sensing element. The strain induced changes in resistance (piezoresistive effect) are generally lower compared to the changes induced by temperature. The temperature dependence of the sensitivity to strain was investigated utilizing both single element piezoresistors and piezoresistors connected to a Wheatstone bridge. The study analyzes strain-gauges under longitudinal tensile and compressive strain and temperatures up to 80 °C. Screen printed strain gauges can provide reliable and robust strain measurements for coated metallic substrates, the sensor performance is comparable to the conventional solution with glued sensors. Full article

(This article belongs to the Proceedings of Proceedings of Eurosensors 2017, Paris, France, 3–6 September 2017)

► Show Figures

Figure 1

4 pages, 655 KiB

Open AccessProceeding Paper

Towards Recycled Paper Based Impedance Biosensor with Wireless Readout

by Eva Melnik, Iris Muschlin, Agnes Wildauer, Mirco Raskovic, Joerg Schotter, Michael Heilmann, Dirk Ide, Michael Borinski, Peter Lieberzeit, Nadezhda Kataeva, Giorgio C. Mutinati, Rudolf Heer and Rainer Hainberger

Proceedings 2017, 1(4), 619; https://doi.org/10.3390/proceedings1040619 - 18 Aug 2017

Cited by 2 | Viewed by 2094

Abstract

Results are presented regarding the development of recycled paper based impedance biosensors with screen printed interdigitated electrode structures (IDES). The sensors show a response to increasing salt concentrations in the range 30–100 mM NaCl. To prove the feasibility of using recycled paper, biofunctionalization [...] Read more.

Results are presented regarding the development of recycled paper based impedance biosensors with screen printed interdigitated electrode structures (IDES). The sensors show a response to increasing salt concentrations in the range 30–100 mM NaCl. To prove the feasibility of using recycled paper, biofunctionalization with a glucose sensitive enzyme mixture was performed by inkjet printing. The quantification of the glucose sensitive colour change reaction in paper was investigated and a trend is found in the range of 6–90 mg/dL. Subsequently, measurements with a wireless electronic readout system were performed on an electrochemical assay showing a decrease of the normalized sensor response dependent from the glucose concentration in the range 0–80 mg/dL. Full article

(This article belongs to the Proceedings of Proceedings of Eurosensors 2017, Paris, France, 3–6 September 2017)

► Show Figures

Figure 1

4 pages, 521 KiB

Open AccessProceeding Paper

Inkjet-Printed ON/OFF Force Sensor on Flexible Substrate for Ultra-Low Power Applications

by Evangéline Bènevent, Mariam Dème Dankoco and Marc Bendahan

Proceedings 2017, 1(4), 620; https://doi.org/10.3390/proceedings1040620 - 17 Aug 2017

Viewed by 1789

Abstract

An ON/OFF force sensor is fabricated by inkjet-printing process on flexible substrates. The goal is to obtain two distinct impedance states respectively to the applied force in order to be easily identifiable by a conditioning electronics for ultra-low power applications, and to avoid [...] Read more.

An ON/OFF force sensor is fabricated by inkjet-printing process on flexible substrates. The goal is to obtain two distinct impedance states respectively to the applied force in order to be easily identifiable by a conditioning electronics for ultra-low power applications, and to avoid the use of an analog-to-digital convertor (ADC) in particular. The sensor is composed of two electrodes separated by a spacer. The elastomer layer constituting the spacer is in polydimethylsiloxane (PDMS). An opening is created in this spacer between the two electrodes in order to define an active area. The force is applied perpendicularly to the surface of the sensor. When no force is applied, the sensor’s electrodes are not in contact, and the resistance R_OFF tends toward infinity. When a force is applied, the sensor’s electrodes are in contact, and the resistance R_ON tends toward 0. The minimal actuation force is as low as 0.01N. Full article

(This article belongs to the Proceedings of Proceedings of Eurosensors 2017, Paris, France, 3–6 September 2017)

► Show Figures

Figure 1

4 pages, 419 KiB

Open AccessProceeding Paper

All Inkjet-Printed B Field Sensor

by Bruno Andò, Salvatore Baglio, Vincenzo Marletta and Antonio Pistorio

Proceedings 2017, 1(4), 621; https://doi.org/10.3390/proceedings1040621 - 17 Aug 2017

Cited by 3 | Viewed by 1988

Abstract

This paper presents the realization and the experimental characterization of a low cost inkjet-printed DC magnetic field sensor. The device consists of a thin flexible cantilever beam operated at its first resonance frequency by the interaction between the target magnetic field and an [...] Read more.

This paper presents the realization and the experimental characterization of a low cost inkjet-printed DC magnetic field sensor. The device consists of a thin flexible cantilever beam operated at its first resonance frequency by the interaction between the target magnetic field and an AC current flowing through a coil printed on the beam. A resistive readout strategy is implemented by a printed strain gauge to measure the beam deflection strength, which is correlated to the target field strength. A dedicated electronics is used for the sake of the sensor operation. The sensor behaviour has been investigated for different values of the driving current and the target magnetic field. As an example, the sensor responsivity and resolution for a driving current of 20 mA @ 9.1 Hz (the beam resonance frequency) are 0.009 Ω/Ω/T and 1.2 mT, respectively. Full article

(This article belongs to the Proceedings of Proceedings of Eurosensors 2017, Paris, France, 3–6 September 2017)

► Show Figures

Figure 1

4 pages, 475 KiB

Open AccessProceeding Paper

Synthesis and Inkjet Printing of SnO₂ Ink on a Flexible Substrate for Gas Sensor Application

by Omar Kassem, Mohamed Saadaoui, Mathilde Rieu and Jean-Paul Viricelle

Proceedings 2017, 1(4), 622; https://doi.org/10.3390/proceedings1040622 - 8 Aug 2017

Cited by 2 | Viewed by 2371

Abstract

Sol based SnO₂ precursor was synthetized by aqueous sol-gel route, then transformed into a stable ink with appropriate viscosity and surface tension to be inkjet printed and sintered at relatively moderate temperature. Plastic foil with thickness of 50 μm was selected as [...] Read more.

Sol based SnO₂ precursor was synthetized by aqueous sol-gel route, then transformed into a stable ink with appropriate viscosity and surface tension to be inkjet printed and sintered at relatively moderate temperature. Plastic foil with thickness of 50 μm was selected as substrate for its high thermal resistance and stability (Upilex-50S). Prepared sol and formulated ink were both characterized by analytical techniques; electrical measurements were performed on the printed sensing film to characterize the response to CO gas in different concentrations, at working temperature of 300 °C. Full article

(This article belongs to the Proceedings of Proceedings of Eurosensors 2017, Paris, France, 3–6 September 2017)

► Show Figures

Figure 1

4 pages, 238 KiB

Open AccessProceeding Paper

Estimation of the Number of Volatile Compounds in Simple Mixtures

by Olivier Hotel, Jean-Philippe Poli, Christine Mer-Calfati, Emmanuel Scorsone and Samuel Saada

Proceedings 2017, 1(4), 623; https://doi.org/10.3390/proceedings1040623 - 11 Aug 2017

Viewed by 1536

Abstract

In this paper, we address the problem of simple mixtures identification using a SAW sensor based e-nose. First, we propose a linearized form of the SAW sensor’s response to mixtures. This equation is then used to set up a linear least squares problem [...] Read more.

In this paper, we address the problem of simple mixtures identification using a SAW sensor based e-nose. First, we propose a linearized form of the SAW sensor’s response to mixtures. This equation is then used to set up a linear least squares problem whose residuals are suitable to identify the number of compounds present in a mixture thanks to a supervised learning algorithm. Full article

(This article belongs to the Proceedings of Proceedings of Eurosensors 2017, Paris, France, 3–6 September 2017)

4 pages, 321 KiB

Open AccessProceeding Paper

Hysteresis and Material Effects of Printed Strain Gauges Embedded in Organic Coatings

by Herbert Enser, Johannes Kilian Sell, Michaela Schatzl-Linder, Bernhard Strauß, Wolfgang Hilber and Bernhard Jakoby

Proceedings 2017, 1(4), 624; https://doi.org/10.3390/proceedings1040624 - 17 Aug 2017

Cited by 10 | Viewed by 2624

Abstract

This work reports on the hysteresis behavior and an initial baseline drift of printed strain gauges embedded in organic coating layers on sheet steel that we recently introduced. We subsequently investigated the performance over an extended period of time, which revealed interesting and [...] Read more.

This work reports on the hysteresis behavior and an initial baseline drift of printed strain gauges embedded in organic coating layers on sheet steel that we recently introduced. We subsequently investigated the performance over an extended period of time, which revealed interesting and partially unexpected material properties of printed strain gauges made from silver and carbon. Both silver- and carbon-based strain gauges show a hysteresis behavior of the gauge factor and non-negligible nonlinear characteristics. Furthermore, the carbon-based sensors show a strong initial base line drift within the first 50–100 cycles. All three effects, namely hysteresis, nonlinear gauge factor and initial base line drift, are confirmed within their respective standard deviations. Full article

(This article belongs to the Proceedings of Proceedings of Eurosensors 2017, Paris, France, 3–6 September 2017)

► Show Figures

Figure 1

6 pages, 1171 KiB

Open AccessProceeding Paper

Realization of Flexible NMR Microcoils

by Meriam Khelifa, Nourdin Yaakoubi, Cherif Dridi, Pascal Picart and Latifa Fakri-Bouchet

Proceedings 2017, 1(4), 625; https://doi.org/10.3390/proceedings1040625 - 7 Aug 2017

Viewed by 1919

Abstract

In this paper, we describe the fabrication of miniaturized flexible Radio frequency RF microcoil for Nuclear Magnetic Resonance (NMR), which have been constructed based on Micro Electro Mechanical Systems (MEMS) technology. 3D Electromagnetic numerical simulations of the physical properties of this microcoil were [...] Read more.

In this paper, we describe the fabrication of miniaturized flexible Radio frequency RF microcoil for Nuclear Magnetic Resonance (NMR), which have been constructed based on Micro Electro Mechanical Systems (MEMS) technology. 3D Electromagnetic numerical simulations of the physical properties of this microcoil were conducted using Multiphysics software. Numerical simulation shows that the rectangular microantenna (500 × 1000 μm²) on kapton substrate has efficient results in terms of magnetic field, inductance, magnetic energy and resistive losses. This micro-coil is fabricated with three mask levels on polyimide substrate using micromoulding technology. Full article

(This article belongs to the Proceedings of Proceedings of Eurosensors 2017, Paris, France, 3–6 September 2017)

► Show Figures

Figure 1

4 pages, 651 KiB

Open AccessProceeding Paper

Integrated Sensor System for Condition Monitoring of Electromechanical Cylinders

by Nikolai Helwig, Philip Merten, Tizian Schneider and Andreas Schütze

Proceedings 2017, 1(4), 626; https://doi.org/10.3390/proceedings1040626 - 9 Aug 2017

Cited by 4 | Viewed by 2290

Abstract

In this work, a sensor system mechanically integrated in an electromechanical cylinder is presented with the goal of measuring relevant quantities for condition monitoring. The system monitors those parts of the cylinder which are mainly affected by wear processes, i.e., spindle drive and [...] Read more.

In this work, a sensor system mechanically integrated in an electromechanical cylinder is presented with the goal of measuring relevant quantities for condition monitoring. The system monitors those parts of the cylinder which are mainly affected by wear processes, i.e., spindle drive and ball bearings. Primarily low-cost MEMS sensors, e.g., for acceleration/vibration, IR emission, and position, are integrated on specially designed ring PCBs which are mounted at the front of the spindle ball screw nut allowing, e.g., the detection of spindle defects. Full article

(This article belongs to the Proceedings of Proceedings of Eurosensors 2017, Paris, France, 3–6 September 2017)

► Show Figures

Figure 1

4 pages, 686 KiB

Open AccessProceeding Paper

Online Monitoring of Composites with a Miniaturized Flexible Combined Dielectric and Temperature Sensor

by Martina Hübner and Walter Lang

Proceedings 2017, 1(4), 627; https://doi.org/10.3390/proceedings1040627 - 11 Aug 2017

Cited by 7 | Viewed by 2292

Abstract

We present a foil based miniaturized impedance sensor combined with a temperature sensitive structure to be integrated in Carbon-Fiber-Reinforced-Polymer (CFRP). Commercially available sensors are too big and they weaken the CFRP. In contrast the influence of our miniaturized flexible sensor can be neglected [...] Read more.

We present a foil based miniaturized impedance sensor combined with a temperature sensitive structure to be integrated in Carbon-Fiber-Reinforced-Polymer (CFRP). Commercially available sensors are too big and they weaken the CFRP. In contrast the influence of our miniaturized flexible sensor can be neglected due to its size (5 µm thick); it is in the range of the fibers’ diameter. The sensor can remain in the produced part without disruption and even be used for structural health monitoring. Our sensor will enable automated control of the curing process and improve the fabrication. This is the first time impedance and temperature sensing is combined in such a small size. Full article

(This article belongs to the Proceedings of Proceedings of Eurosensors 2017, Paris, France, 3–6 September 2017)

► Show Figures

Figure 1

4 pages, 814 KiB

Open AccessProceeding Paper

Strangers in the Night—Smart Process Sensors in Our Current Automation Landscape

by Michael Maiwald, Patrick Gräßer, Lukas Wander, Nicolai Zientek, Svetlana Guhl, Klas Meyer and Simon Kern

Proceedings 2017, 1(4), 628; https://doi.org/10.3390/proceedings1040628 - 21 Aug 2017

Cited by 6 | Viewed by 2801

Abstract

The departure from the current automation landscape to next generation automation concepts for the process industry has already begun. Smart functions of sensors simplify their use and enable plug-and-play integration, even though they may appear to be more complex at first sight. Smart [...] Read more.

The departure from the current automation landscape to next generation automation concepts for the process industry has already begun. Smart functions of sensors simplify their use and enable plug-and-play integration, even though they may appear to be more complex at first sight. Smart sensors enable concepts like self-diagnostics, self-calibration, and self-configuration/parameterization whenever our current automation landscape allows it. Here we summarize the currently discussed general requirements for process sensors 4.0 and introduce a smart online NMR sensor module as example, which was developed for an intensified industrial process funded by the EU’s Horizon 2020 research and innovation programme (www.consens-spire.eu). Full article

(This article belongs to the Proceedings of Proceedings of Eurosensors 2017, Paris, France, 3–6 September 2017)

► Show Figures

Figure 1

5 pages, 1232 KiB

Open AccessProceeding Paper

Passive and Chipless Packaged Sensor for the Wireless Pressure Monitoring in Harsh Environment

by Julien Philippe, Cristina Arenas, Dominique Henry, Anthony Coustou, Alexandre Rumeau, Hervé Aubert and Patrick Pons

Proceedings 2017, 1(4), 629; https://doi.org/10.3390/proceedings1040629 - 8 Aug 2017

Cited by 3 | Viewed by 2133

Abstract

A new millimetre-wave passive and chipless packaged sensor for wireless pressure monitoring in harsh environment is proposed. This sensor uses a planar microstrip resonator coupled with a high resistivity silicon membrane. The remote interrogation of this sensor is performed from a Frequency-Modulated Continuous-Wave [...] Read more.

A new millimetre-wave passive and chipless packaged sensor for wireless pressure monitoring in harsh environment is proposed. This sensor uses a planar microstrip resonator coupled with a high resistivity silicon membrane. The remote interrogation of this sensor is performed from a Frequency-Modulated Continuous-Wave (FMCW) radar. Prototypes have been designed and fabricated using photoresist intermediate layer for the silicon membrane bonding. Pressure characterization of packaged sensor validate the transducer and packaging hermeticity. The sensor sensitivity is close to 2% per bar for the resonant frequency and the radar response is evaluated at 2 dB per bar. Full article

(This article belongs to the Proceedings of Proceedings of Eurosensors 2017, Paris, France, 3–6 September 2017)

► Show Figures

Figure 1

4 pages, 1661 KiB

Open AccessProceeding Paper

Electrochemical Multisensor System for Monitoring the Hydrogen Peroxide Direct Synthesis in Microreactors

by Sebastian Urban, Andreas Weltin, Hubert Flamm, Jochen Kieninger, Benedikt J. Deschner, Manfred Kraut, Roland Dittmeyer and Gerald A. Urban

Proceedings 2017, 1(4), 630; https://doi.org/10.3390/proceedings1040630 - 8 Aug 2017

Cited by 1 | Viewed by 2216

Abstract

We present an electrochemical sensor system for the detection of hydrogen peroxide inside a direct synthesis microreactor. The setup allows the online, in situ measurement of high reactant concentrations by amperometric detection across the micro channel width and length. The robust integration of [...] Read more.

We present an electrochemical sensor system for the detection of hydrogen peroxide inside a direct synthesis microreactor. The setup allows the online, in situ measurement of high reactant concentrations by amperometric detection across the micro channel width and length. The robust integration of the electrochemical cell in the microreactor was demonstrated. Hydrogen peroxide was detected under reaction conditions (pH 3–4, presence of bromide) showing linear behaviour up to 2 mM with high sensitivity and excellent stability. The linear range was increased up to 10 mM by applying a diffusion limiting pHEMA layer to the electrode surface. Full article

(This article belongs to the Proceedings of Proceedings of Eurosensors 2017, Paris, France, 3–6 September 2017)

► Show Figures

Figure 1

4 pages, 413 KiB

Open AccessProceeding Paper

Surface Integrated Printed Interdigital Structure for Process Monitoring the Curing of an Adhesive Joint

by Martina Hübner, Walter Lang and Gerrit Dumstorff

Proceedings 2017, 1(4), 631; https://doi.org/10.3390/proceedings1040631 - 11 Aug 2017

Cited by 1 | Viewed by 1686

Abstract

We present a printable interdigital structure, integrated into the surface of a component, to monitor the curing of two adhesively joint components during the fabrication process. In the factory of the future there is a need of new sensor concepts beside the information [...] Read more.

We present a printable interdigital structure, integrated into the surface of a component, to monitor the curing of two adhesively joint components during the fabrication process. In the factory of the future there is a need of new sensor concepts beside the information technological infrastructure. Monitoring of the fabrication enables automated control of the process which improves the quality of adhesive joints. In addition, the cost can be reduced by individually adapted curing times. We demonstrate that cure monitoring with the printed interdigital structure is possible. Two adhesives, a fast and a slow curing one, are analyzed to show the high potential of this process monitoring method. Full article

(This article belongs to the Proceedings of Proceedings of Eurosensors 2017, Paris, France, 3–6 September 2017)

► Show Figures

Figure 1

4 pages, 762 KiB

Open AccessProceeding Paper

Intelligent Machine Parts: Challenges in the Condition Monitoring of Elastomer Gaskets with Integrated Sensors

by Daniel Gräbner, Robert Zahn, Ulrich Giese and Walter Lang

Proceedings 2017, 1(4), 632; https://doi.org/10.3390/proceedings1040632 - 18 Aug 2017

Cited by 1 | Viewed by 2361

Abstract

Smart factories are supposed to provide an overview on the current status of installed production machines. In order to collect data, intelligent machine parts have to be designed. We present a method to monitor the condition of elastomer gaskets, which are crucial parts [...] Read more.

Smart factories are supposed to provide an overview on the current status of installed production machines. In order to collect data, intelligent machine parts have to be designed. We present a method to monitor the condition of elastomer gaskets, which are crucial parts of many machines. The monitoring is done by a strain gauge, which is integrated into the gasket. This paper describes the overall concept of the monitoring system as well as the challenges by varying temperature and pressure of the sealed fluid on the sensors signal. Full article

(This article belongs to the Proceedings of Proceedings of Eurosensors 2017, Paris, France, 3–6 September 2017)

► Show Figures

Figure 1

4 pages, 641 KiB

Open AccessProceeding Paper

Microscale Gas Chromatography with Microsensor Array Detection: Challenges and Prospects

by Junqi Wang, Nicolas Nuñovero, Changhua Zhan, Robert Nidetz, William H. Steinecker, Seth J. Peterson, Bryan M. Brookover and Edward T. Zellers

Proceedings 2017, 1(4), 633; https://doi.org/10.3390/proceedings1040633 - 16 Aug 2017

Cited by 2 | Viewed by 2405

Abstract

The capability to analyze complex mixtures of airborne volatile organic compounds (VOCs) at low concentrations; in situ; has implications for environmental monitoring; worker exposure assessment; biomedical diagnostics; and population security. Since standalone microsensor arrays lack this capability; upstream separation of mixture components; often [...] Read more.

The capability to analyze complex mixtures of airborne volatile organic compounds (VOCs) at low concentrations; in situ; has implications for environmental monitoring; worker exposure assessment; biomedical diagnostics; and population security. Since standalone microsensor arrays lack this capability; upstream separation of mixture components; often preceded by preconcentration; is required. Although significant advances have been made via MEMS technologies in the development of microscale gas chromatographic (μGC) systems; many challenges remain. This presentation will review selected aspects of the state-of-the-art in μGC for VOC mixture analysis. Here; we emphasize our progress toward a wearable μGC prototype. Full article

(This article belongs to the Proceedings of Proceedings of Eurosensors 2017, Paris, France, 3–6 September 2017)

► Show Figures

Figure 1

4 pages, 1420 KiB

Open AccessProceeding Paper

Optical and Electrical Characterizations of Uncooled Bolometers Based on LSMO Thin Films

by Vanuza M. Nascimento, Mario E. B. G. N. Silva, Shuang Liu, Leandro Manera, Laurence Méchin and Bruno Guillet

Proceedings 2017, 1(4), 634; https://doi.org/10.3390/proceedings1040634 - 18 Sep 2017

Viewed by 2302

Abstract

In this paper the optical and electrical characterization of a 75 × 75 µm² uncooled bolometers based on free-standing La_0.7Sr_0.3MnO₃ /CaTiO₃ (LSMO/CTO) thin films fabricated by micromachining of the silicon substrates is presented. R(T) curves have [...] Read more.

In this paper the optical and electrical characterization of a 75 × 75 µm² uncooled bolometers based on free-standing La_0.7Sr_0.3MnO₃ /CaTiO₃ (LSMO/CTO) thin films fabricated by micromachining of the silicon substrates is presented. R(T) curves have been compared to electro thermal simulations. Its thermal conductance was measured to be 9 × 10⁻⁶ W·K⁻¹ around 300 K. The optical characterization was performed by modulating the power of a 635 nm laser diode and was carried out at different bias currents and temperatures. Finally, the frequency dependence of the bolometer presented at different temperatures and at optimal current shows that both sensitive and fast uncooled bolometers can be fabricated using suspended LSMO thin films. Full article

(This article belongs to the Proceedings of Proceedings of Eurosensors 2017, Paris, France, 3–6 September 2017)

► Show Figures

Figure 1

3 pages, 465 KiB

Open AccessProceeding Paper

Magnetic Sensors Based on AMR Effect in LSMO Thin Films

by Olivier Rousseau, Stéphane Flament, Bruno Guillet, Marc Lam Chok Sing and Laurence Méchin

Proceedings 2017, 1(4), 635; https://doi.org/10.3390/proceedings1040635 - 14 Sep 2017

Cited by 7 | Viewed by 3026

Abstract

In this paper, the potentialities of the manganese oxide compound La_0.7Sr_0.3MnO₃(LSMO) for the realization of sensitive room temperature magnetoresistive sensors are discussed. LSMO films deposited on various types of substrates having different magnetic anisotropies were patterned to [...] Read more.

In this paper, the potentialities of the manganese oxide compound La_0.7Sr_0.3MnO₃(LSMO) for the realization of sensitive room temperature magnetoresistive sensors are discussed. LSMO films deposited on various types of substrates having different magnetic anisotropies were patterned to form rectangular stripes of width 100 µm and length 300 µm. It is shown that, apart from the well-known colossal magnetoresistance contribution, the anisotropic magnetoresistance effects can be used to exhibit competitive performance at room temperature benefiting from the very low noise of LSMO thin films. Full article

(This article belongs to the Proceedings of Proceedings of Eurosensors 2017, Paris, France, 3–6 September 2017)

► Show Figures

Figure 1

Journal Menu

Journal Browser

Proceedings, 2017, Eurosensors 2017

Eurosensors 2017

Editorial

Other

Further Information

Guidelines

MDPI Initiatives

Follow MDPI