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Proceedings, 2019, GOSPEL 2019

The 8th GOSPEL Workshop. Gas Sensors Based on Semiconducting Metal Oxides: Basic Understanding & Application Fields

Ferrara, Italy | 20–21 June 2019

Volume Editors:
Prof. Dr. Vincenzo Guidi (Chair)
Prof. Dr. Cesare Malagù
Dr. Barbara Fabbri
Matteo Valt


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Cover Story (view full-size image) GOSPEL is an international biannual research meeting dedicated to R&D activities in the field of [...] Read more.
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Open AccessProceedings
The Influence of Temperature and Visible Light Activation on the NO2 Response of WO3 Nanofibers Prepared by Electrospinning
Published: 18 June 2019
Viewed by 315 | PDF Full-text (980 KB)
Abstract
Aim of this work is to compare the electrical responses to 100–400 ppb NO2 gas concentrations of WO3 electrospun nanofibers both activated by thermal (in the temperature range 25–100 °C) and/or visible light at different wavelengths (Red λ = 670 nm, [...] Read more.
Aim of this work is to compare the electrical responses to 100–400 ppb NO2 gas concentrations of WO3 electrospun nanofibers both activated by thermal (in the temperature range 25–100 °C) and/or visible light at different wavelengths (Red λ = 670 nm, Green λ = 550 nm, and Purple-Blue λ = 430 nm). WO3 nanofibers were prepared by mixing a W-O sol-gel transparent solution with a polymeric solution made of PVP and DMF, electospun and subsequently annealed at 450 °C. Regarding gas sensing measurements, Purple Blue light resulted the most effective light source as respect to the others. Light illumination at room temperature revealed to improve both base line recovery and response time, whereas temperature enhances relative response, with a maximum at 75 °C. Light-radiating room temperature gas detection yields a satisfactory response notwithstanding a slight reduction of sensor gas sensitivity. Light induced electrical response mechanisms is presented and discussed. Full article
Open AccessAbstract
Heterogeneous Integration of Metal Oxides—Towards a CMOS Based Multi Gas Sensor Device
Published: 19 June 2019
Viewed by 275 | PDF Full-text (345 KB)
Abstract
A worldwide unique CMOS based chemical sensor device comprising an array of 8 microhotplates (µhps) for a total of 16 chemical sensors has been fabricated (Figure 1). [...] Full article
Open AccessAbstract
Ultra-Low Power MEMS Gas Sensor Technology and Application
Published: 19 June 2019
Viewed by 188 | PDF Full-text (357 KB)
Abstract
The semiconductor type sensor developed by New Cosmos is a very unique sensor depending on its principle and structure.[...] Full article
Open AccessProceedings
SnO2-Pd as a Gate Material for the Capacitor Type Gas Sensor
Published: 19 June 2019
Viewed by 188 | PDF Full-text (499 KB)
Abstract
The article describes the result of the use SnO2-Pd thin films as a gate for structure measured ppb range of NO2 gas by the capacitive method. The technological aspects of fabrication SnO2-Pd gate and one comparison by metrological [...] Read more.
The article describes the result of the use SnO2-Pd thin films as a gate for structure measured ppb range of NO2 gas by the capacitive method. The technological aspects of fabrication SnO2-Pd gate and one comparison by metrological parameters with the classical Pd gate field effect sensor are discussed. The use of SnO2-Pd material allows improvement in sensitivity of NO2 by an order of magnitude compare the classical Pd based gate field effect sensors. Full article
Open AccessAbstract
Role of Sb and Co Doping in SnO2 Sensing Properties toward Ethanol
Published: 19 June 2019
Viewed by 194 | PDF Full-text (113 KB)
Abstract
The adsorption and desorption of oxygen molecule on the surface of oxide semiconductors are the basis for sensing reactions between the surface oxygen species and the target gases molecules. Combined with experiments and theoretical calculations, we found that antimony impurities were conducive to [...] Read more.
The adsorption and desorption of oxygen molecule on the surface of oxide semiconductors are the basis for sensing reactions between the surface oxygen species and the target gases molecules. Combined with experiments and theoretical calculations, we found that antimony impurities were conducive to the promotion of oxygen adsorption and dissociation on the surface of SnO2. However, the narrow Debye length had an adverse effect on sensing properties of Sb doped SnO2. On the contrary, the introduction of cobalt dopant will generate more oxygen vacancies and reduce the concentration of electrons and consequently the Debye length will become longer, which makes the transduction more significant. Namely, the same amount of charge transfer between surface and analyte gases can cause a larger change in resistance than pure metal oxide. The aforementioned inferences about doped metal oxides indicate that for optimizing their sensing properties, doped oxides with appropriate dopant and unique structure which can balance the recognition function and transduction function are required. Full article
Open AccessAbstract
Gas Sensors Based on Oxide Semiconductors with Porous Nanostructures
Published: 19 June 2019
Viewed by 183 | PDF Full-text (109 KB)
Abstract
Gas sensor as a device composed of sensing material coupled with signal transducer, has been acknowledged as an analytical tool for detection and quantification of inflammable, explosive or toxic gases. The gas sensors based on nanostructured oxide semiconductor endowed with excellent sensing properties [...] Read more.
Gas sensor as a device composed of sensing material coupled with signal transducer, has been acknowledged as an analytical tool for detection and quantification of inflammable, explosive or toxic gases. The gas sensors based on nanostructured oxide semiconductor endowed with excellent sensing properties have exhibited great potential application in the fields of environmental monitoring, resource exploration, medical welfare, etc. It is well known that the sensing mechanism of sensor employing oxide semiconductors is mainly that the interactions between the surface adsorbed oxygen species and target gases lead to a change in the electrical conductivity. Therefore, the gas sensing properties of oxide semiconductors are closely related with their composition, crystalline size, and microstructure. In this regard, design and preparation of oxides with novel architectures will be increasingly important in the construction of high performance gas sensors. Due to high specific surface area, low density, and good surface permeability, porous nanostructures oxide semiconductor sensing materials have attracted growing interest in recent years. In our work, we successfully prepared various porous nanostructures oxides and their composites to the construction of high performances gas sensors with enhanced sensitivity, selectivity, as well as lowered detection limit. The subsequent gas sensing measurements explicitly revealed that these oxides and composites manifested superior sensing behaviors (like much higher sensitivity and faster response speed), which can be ascribed to the porous architectures and the synergistic effects. Full article
Open AccessProceedings
Rare-Earth Based Chemoresistive CO2 Sensors and Their Operando Investigations
Published: 19 June 2019
Viewed by 215 | PDF Full-text (336 KB)
Abstract
Rare-earth oxycarbonates have been proposed as promising chemoresistive materials for CO2 sensors. In this contribution we present the results of a broad investigation focused on selecting the best candidates in the rare-earth compounds and, in the case of the best performing material, [...] Read more.
Rare-earth oxycarbonates have been proposed as promising chemoresistive materials for CO2 sensors. In this contribution we present the results of a broad investigation focused on selecting the best candidates in the rare-earth compounds and, in the case of the best performing material, preliminary results dealing with the understanding of sensing by the operando methods. Full article
Open AccessProceedings
Consideration for Oxygen Adsorption Species on SnO2 Semiconductor Gas Sensors
Published: 19 June 2019
Viewed by 194 | PDF Full-text (362 KB)
Abstract
Water vapor is the most important factor to influence on gas sensing properties. […] Full article
Open AccessProceedings
Testing the Reliability of Flexible MOX Gas Sensors under Strain
Published: 19 June 2019
Viewed by 183 | PDF Full-text (516 KB)
Abstract
We present flexible chemo-resistive sensors based on AACVD grown tungsten trioxide (WO3) nanowires. The sensor response to gases, before and after a 50-cycle bending test, is reported. Thus, proving that reliable gas sensors, able to withstand repeated bending, have been achieved. [...] Read more.
We present flexible chemo-resistive sensors based on AACVD grown tungsten trioxide (WO3) nanowires. The sensor response to gases, before and after a 50-cycle bending test, is reported. Thus, proving that reliable gas sensors, able to withstand repeated bending, have been achieved. Moreover, their integrity and durability have been tested under harsh bending conditions until break down. Full article
Open AccessAbstract
Elaboration and Characterization of SnO2 Doped TiO2 Gas Sensors Deposited through Dip and Spin Coating Methods
Published: 19 June 2019
Viewed by 187 | PDF Full-text (1250 KB)
Abstract
Semiconductor functional materials play an increasingly important role in science and technology because of their unique optical, electrical, magnetic, catalytic and chemical properties. They are widely used in fields such as solar cell, photo-catalysts, optical coating, capacitors for large scale integrated devices, electrochromic [...] Read more.
Semiconductor functional materials play an increasingly important role in science and technology because of their unique optical, electrical, magnetic, catalytic and chemical properties. They are widely used in fields such as solar cell, photo-catalysts, optical coating, capacitors for large scale integrated devices, electrochromic systems and gas sensors. One important application for semiconductor gas sensors is the detection of pollutant gases for the control of the combustion process. Full article
Open AccessProceedings
Towards the Miniaturization of Electronic Nose as Personal Measurement Systems
Published: 19 June 2019
Viewed by 186 | PDF Full-text (1008 KB)
Abstract
This study addresses the development of a miniaturized wireless sensing module (electronic nose) for a personal use in air quality detection. [...] Full article
Open AccessProceedings
Identification of Poisonous Mushrooms by Means of a Hand-Held Electronic Nose
Published: 19 June 2019
Viewed by 224 | PDF Full-text (249 KB)
Abstract
This work presents a practical application of an electronic nose to fast and efficient discrimination of different species of Amanita mushrooms. The electronic nose instrument were utilized for investigation of discrimination capability with respect to odour profile of these fungi. The home-made prototype [...] Read more.
This work presents a practical application of an electronic nose to fast and efficient discrimination of different species of Amanita mushrooms. The electronic nose instrument were utilized for investigation of discrimination capability with respect to odour profile of these fungi. The home-made prototype was based on MOS-type chemical sensors and headspace sampling method. Samples were cut into thin sheets, placed in glass vials and maintained at a constant temperature using a thermostatic bath, the headspace of which was subjected to analysis. The data were analysed using multivariate methods: PCA, LDA and Artificial Neural Networks. The obtained results confirmed legitimacy of application of the electronic nose technique to identification and discrimination of fungi species. Results show a correct classification of the fungi species at the level of 80–100%. Full article
Open AccessProceedings
Semiconductor Gas Sensors to Analyze Fecal Exhalation as a Method for Colorectal Cancer Screening
Published: 19 June 2019
Viewed by 172 | PDF Full-text (185 KB)
Abstract
Colorectal cancer (CRC) preventive screening is fundamental to identify tumors before their possible degeneration. [...] Full article
Open AccessAbstract
Self-Heated Graphene Microchannels for Low-Power-Consumption Chemoresistive Sensor Array
Published: 19 June 2019
Viewed by 176 | PDF Full-text (301 KB)
Abstract
The Internet of Everything (IoE) refers to billions of objects having intelligent connections with processed data. Sensors hold the key to the IoE as they detect and assess the internal and external states of objects. [...] Full article
Open AccessProceedings
ZnO Nanostructures for Gas Sensing Applications: From Tetrapods-Based Chemoresistive Devices to Carbon Fiber Integration
Published: 19 June 2019
Viewed by 168 | PDF Full-text (161 KB)
Abstract
Zinc oxide (ZnO) nanostructures can be grown in different morphologies by means of a wide range of techniques. […] Full article
Open AccessProceedings
Chemically Sensitive Photoluminescence of InGaN/GaN Nanowire Heterostructure Arrays
Published: 19 June 2019
Viewed by 368 | PDF Full-text (452 KB)
Abstract
III-nitride semiconductors (AlGaN, GaN and InGaN) have received considerable attention in various fields ranging from high-frequency and high-temperature electronics [1] to LED lighting technologies [2]. [...] Full article
Open AccessProceedings
Synergistic Effect of Nanocrystalline SnO2 Sensitization by Bimetallic Au and Pd Modification via Ingle Step Flame Spray Pyrolysis Technique
Published: 19 June 2019
Viewed by 208 | PDF Full-text (525 KB)
Abstract
Convenient and scalable single step flame spray pyrolysis (FSP) synthesis of bimetal AuPd sensitized nanocrystalline SnO2 for gas sensor application is reported. The materials chemical composition, structure and morphology has been studied by XRD, XPS, HAADFSTEM, BET, ICP-MS techniques as well as [...] Read more.
Convenient and scalable single step flame spray pyrolysis (FSP) synthesis of bimetal AuPd sensitized nanocrystalline SnO2 for gas sensor application is reported. The materials chemical composition, structure and morphology has been studied by XRD, XPS, HAADFSTEM, BET, ICP-MS techniques as well as thermo-programmed reduction with hydrogen (TPR-H2). Superior gas sensor response of bimetal modified SnO2 towards wide concentration range of reducing (CO, CH4, C3H8, H2S, NH3) and oxidizing (NO2) gases compared to pure and monometallic modified SnO2 is reported. The observed enhanced gas sensor performance is concluded to arise from combination of facilitated oxygen molecule spillover on gold particles and electronic effect of Fermi level control by reoxidizing Pd-PdO clusters, homogeneously distributed over SnO2 particles surface. Full article
Open AccessProceedings
Selective Detection of Hydrocarbons in Real Atmospheric Conditions by Single MOX Sensor in Temperature Modulation Mode
Published: 19 June 2019
Viewed by 218 | PDF Full-text (802 KB)
Abstract
Selective detection of hydrocarbons – methane and propane – in urban air for industrial safety properties by single metal oxide semiconductor gas sensor has been demonstrated. As sensors were fabricated on the basis of nanocrystalline SnO2 and alumina micro-hotplates. Sensor working temperature [...] Read more.
Selective detection of hydrocarbons – methane and propane – in urban air for industrial safety properties by single metal oxide semiconductor gas sensor has been demonstrated. As sensors were fabricated on the basis of nanocrystalline SnO2 and alumina micro-hotplates. Sensor working temperature modulation has been applied during raw sensor data collection. Pre-processing of acquired data – scaling, baseline extraction and exclusion of non-valid data points has been demonstrated to be critical procedures before application of machine learning algorithms. The achieved accuracy of 86% for correct gas identification in 40-200 ppm range has been demonstrated. Full article
Open AccessAbstract
Sub-ppm NO2 Sensing in Temperature Cycled Mode with Ga Doped ZnO Thin Films Deposited by RF Sputtering
Published: 19 June 2019
Viewed by 195 | PDF Full-text (478 KB)
Abstract
In this work Ga doped ZnO thin films have been deposited by RF magnetron sputtering onto a silicon micro-hotplate and their structural, microstructural and gas sensing properties have been studied. ZnO:Ga thin film with a thickness of 50 nm has been deposited onto [...] Read more.
In this work Ga doped ZnO thin films have been deposited by RF magnetron sputtering onto a silicon micro-hotplate and their structural, microstructural and gas sensing properties have been studied. ZnO:Ga thin film with a thickness of 50 nm has been deposited onto a silicon based micro-hotplates without any photolithography process thanks to a low cost and reliable stencil mask process. Sub-ppm sensing (500 ppb) of NO2 gas at low temperature (50 °C) has been obtained with promising responses R/R0 up to 18. Full article
Open AccessAbstract
A Novel Modular System for Breath Analysis Using Temperature Modulated MOX Sensors
Published: 19 June 2019
Viewed by 265 | PDF Full-text (606 KB)
Abstract
In this work, a new generation of gas sensing systems specially designed for breath analysis is presented. The developed system comprises a compact modular, low volume, temperature-controlled sensing chamber with three compartments that can host different sensor types. In the presented system, one [...] Read more.
In this work, a new generation of gas sensing systems specially designed for breath analysis is presented. The developed system comprises a compact modular, low volume, temperature-controlled sensing chamber with three compartments that can host different sensor types. In the presented system, one compartment contains an array of 8 analog MOX sensors and the other two 10 digital MOX sensors each. Here, we test the system for the detection of low concentrations of several compounds. Full article
Open AccessAbstract
A Multi-MOx Sensor Approach to Measure Oxidizing and Reducing Gases
Published: 19 June 2019
Viewed by 184 | PDF Full-text (226 KB)
Abstract
This report summarizes our recent work on a p-type/n-type Multi-MOx gas sensor platform for simultaneously measuring oxidizing and reducing gases. Full article
Open AccessProceedings
Rapid Prototyping of MOX Gas Sensors in Form-Factor of SMD Packages
Published: 19 June 2019
Viewed by 202 | PDF Full-text (1155 KB)
Abstract
By laser micromilling technology it is possible to fabricate custom MEMS microhotplate platform and also SMD package for MOX sensor, that gives complete solution for integration in mobile devices-smart phones, tablets and etc. The 3D design and fabrication of MEMS microhotplates and packages [...] Read more.
By laser micromilling technology it is possible to fabricate custom MEMS microhotplate platform and also SMD package for MOX sensor, that gives complete solution for integration in mobile devices-smart phones, tablets and etc. The 3D design and fabrication of MEMS microhotplates and packages products occurs simultaneously that give opportunity for ultra-fast time making unique solutions for MOX sensors (number of microhotplates, hot spot size on microhotplates, diameter holes in package cap and etc.) without looking at standard solutions (primarily the package type). Full article
Open AccessAbstract
Application Runs the Show: What Can We Learn about the Future from the Past?
Published: 21 June 2019
Viewed by 334 | PDF Full-text (285 KB)
Abstract
SMOX-based sensors appeared as a response to a very serious safety issue in Japan, namely gas explosion accidents related to leakages of piped and bottled cooking gas. […] Full article
Open AccessProceedings
Elaboration and Characterization of CuO Thin Films by Spray Pyrolysis Method for Gas Sensors Applications
Published: 28 June 2019
Viewed by 219 | PDF Full-text (322 KB)
Abstract
Abstract: Metal oxide semiconductor gas sensors are used in a various applications in environmental, industrial and medical field, for instance. They are relatively inexpensive compared to other sensing technologies, robust, lightweight, long lasting and benefit from high material sensitivity and quick response [...] Read more.
Abstract: Metal oxide semiconductor gas sensors are used in a various applications in environmental, industrial and medical field, for instance. They are relatively inexpensive compared to other sensing technologies, robust, lightweight, long lasting and benefit from high material sensitivity and quick response times. Copper oxide (CuO) thin film has been promisingly proposed for chemical sensing applications. Particularly, it has been recommended as a sensitive layer for monitoring harmful and combustible gases. It is an attractive material because of nontoxic, inexpensive, abundance advantages, and its fabrication is easy. In this work, we have synthesized CuO thin films by Spray pyrolysis method. The effect of the temperature deposition is investigated:to say 350 °C, 400 °C, and 450 °C while the deposition duration was kipped to 15 min. The samples were analyzed by X-ray diffraction, Raman spectroscopy, XPS analysis, UV-visible transmission and four points probe method. Full article

Other

Jump to: Research

Open AccessExtended Abstract
Selective Detection of Hydrogen and Hydrogen Containing Gases with Metal Oxide Gas Sensor Operating in Non-Stationary Thermal Regime
Published: 18 June 2019
Viewed by 228 | PDF Full-text (541 KB)
Abstract
The main disadvantage of metal oxide (MOX) gas sensors is their insufficient selectivity leading
to the dominating application for the quantitative analysis of one-component systems with certain
composition, for example, CH4-air or H2-air. [...] Full article
Open AccessExtended Abstract
Application of a Micro-Machined Electronic Nose to Detect Escherichia Coli in Human Urine Samples
Published: 18 June 2019
Viewed by 222 | PDF Full-text (285 KB)
Abstract
The analysis of volatile organic compounds (VOCs) as disease biomarkers released by the urine [...] Full article
Open AccessExtended Abstract
Elaboration and Characterization of SnS Thin Film for Gas Sensors Application
Published: 18 June 2019
Viewed by 269 | PDF Full-text (181 KB)
Abstract
The tin sulfide (SnS) has p-type conductivity, high absorption coefficient (≥104 cm−1), […] Full article
Open AccessExtended Abstract
How the Gas Flow Affects Conductometric Sensor Performance
Published: 19 June 2019
Viewed by 180 | PDF Full-text (339 KB)
Abstract
The performance of a metal oxide gas sensor can be affected by different parameters as the fabrication process of the sensitive layer or the post-annealing treatment. [...] Full article
Open AccessExtended Abstract
Morphological Control of Metal Oxide for Semiconductor-Based Gas Sensor
Published: 19 June 2019
Viewed by 174 | PDF Full-text (758 KB)
Abstract
Morphological control of metal oxide (MO) is important for enhancement of sensing properties such as sensor response and response-recovery characteristics. [...] Full article
Open AccessExtended Abstract
Micro Light Plates for Photoactivated Micro-Power Gas Sensors
Published: 19 June 2019
Viewed by 210 | PDF Full-text (633 KB)
Abstract
In this contribution we present a highly miniaturized device that integrates a photoactive material with a highly efficient LED light source. This so-called micro light plate configuration (µLP) allows for maximizing the irradiance impinging on the photoactive material, with a minimum power consumption, [...] Read more.
In this contribution we present a highly miniaturized device that integrates a photoactive material with a highly efficient LED light source. This so-called micro light plate configuration (µLP) allows for maximizing the irradiance impinging on the photoactive material, with a minimum power consumption, excellent uniformity and accurate control of the illumination. We demonstrate that, with the µLP approach, very efficient low power gas sensors can be built, and provide a detailed analysis of the rationales behind such improvement, as well as a quantitative model and a set of design rules to implement it in further integrated applications. As a demonstrator, we will describe a NO2 gas sensor operating in the part per billion range (ppb) with microwatt (µW) power consumption. These are the best figures reported to date in conductometric metal-oxides (MOX) sensors operated with light (instead of heat) at room temperature. Full article
Open AccessExtended Abstract
Shining Light on Indium Oxide Gas Sensors at Work: A Combined Operando Raman/UV-Vis/FT-IR Spectroscopic Study
Published: 19 June 2019
Viewed by 188 | PDF Full-text (483 KB)
Abstract
Understanding the mode of operation of metal-oxide gas sensors (e.g., SnO2, In2O3) is of great scientific and economic interest. [...] Full article
Open AccessExtended Abstract
Influence of Oxygen Vacancies in Gas Sensors Based on Tin Dioxide Nanostructure: A First Principles Study
Published: 19 June 2019
Viewed by 194 | PDF Full-text (324 KB)
Abstract
The use of computer simulations for performance predictions has become almost essential.[...] Full article
Open AccessExtended Abstract
Realizing the Control of Fermi Level and Gas-Sensing Selectivity over Gallium-Doped In2O3 Inverse Opal Microspheres
Published: 19 June 2019
Viewed by 155 | PDF Full-text (1890 KB)
Abstract
Herein, formaldehyde sensors based on gallium-doped In2O3 inverse opal [...] Full article
Open AccessExtended Abstract
SACMI Electronic Olfactory System Based on Semiconducting Metal Oxides
Published: 19 June 2019
Viewed by 156 | PDF Full-text (549 KB)
Abstract
Electronic Olfactory Systems, also called Electronic Noses, are instruments designed to mimic the sense of smell. […] Full article
Open AccessExtended Abstract
Optical Gas Sensors Based on Localised Surface Plasmon Resonance
Published: 19 June 2019
Viewed by 170 | PDF Full-text (171 KB)
Abstract
Gas species recognition through fully optical devices is currently a raising trend over the wellestablished
conductometric approach [...] Full article
Open AccessExtended Abstract
Selective Gas Sensor Based on Metal Oxide Nanostructure
Published: 19 June 2019
Viewed by 171 | PDF Full-text (695 KB)
Abstract
Hydrogen sulfide (H2S) is a colorless, highly flammable and toxic gas. It is produced due to
industrial activities including petroleum refineries [...] Full article
Open AccessExtended Abstract
Comparative Analysis between Blood Test and Breath Analysis Using Sensors Array for Diabetic Patients
Published: 19 June 2019
Viewed by 192 | PDF Full-text (615 KB)
Abstract
Acetone was one of the volatile organic compounds present in respiration, and acetone contained in the exhalation of diabetic patients was found to be a combustion metabolite of body fat. [...] Full article
Open AccessExtended Abstract
Ultra-High Sensitive (Ppt) Gas Sensor Based on the Pulse Heating Using MEMS Technique
Published: 19 June 2019
Viewed by 194 | PDF Full-text (853 KB)
Abstract
High sensitivity and low limit of detection to volatile organic compounds (VOCs) gases are typical properties on the resistive-type semiconductor gas sensors using SnO2-based materials. […] Full article
Open AccessExtended Abstract
Surface Properties of SnO2 Nanolayers Deposited by Rheotaxial Growth and Vacuum Oxidation for Potential Gas Sensor Applications
Published: 19 June 2019
Viewed by 163 | PDF Full-text (877 KB)
Abstract
Within this work the advantages of Rheotaxial Growth and Vacuum Oxidation i.e. maximal
extension of internal surfaces, small degree of nanograins [...] Full article
Open AccessExtended Abstract
H2S Sensing Properties of a Diode-Type Device Using ZnO Nanorods Coupled with CuO Nanocrystals
Published: 19 June 2019
Viewed by 166 | PDF Full-text (703 KB)
Abstract
Hydrogen sulfide (H2S) is known as a colorless, flammable and highly toxic gas with strong odor. […] Full article
Open AccessExtended Abstract
Monitoring Surface Stoichiometry, Work Function and Valance Band of Tungsten Oxide (WO3), Molybdenum Oxide (MoO3) and Tin Oxide (SnO2) Thin Films as a Function of Temperature and Oxygen Partial Pressure with Advanced Surface Sensitive Techniques for Chemical Sensing Applications
Published: 19 June 2019
Viewed by 223 | PDF Full-text (919 KB)
Abstract
Atomic layer deposition (ALD) is a chemical vapor deposition (CVD) deposition method in
which high-quality [...] Full article
Open AccessExtended Abstract
Gas Sensing with Porphyrin Functionalized Metal Oxide Nanostructures
Published: 19 June 2019
Viewed by 195 | PDF Full-text (385 KB)
Abstract
In the last years we have been interested to study the interplay of light and gas sensitivity in hybrid materials formed by porphyrins grafted onto ZnO nanostructures. [...] Full article
Open AccessExtended Abstract
Chemoresistive Nanostructured Sensors for Tumor Pre-Screening
Published: 19 June 2019
Viewed by 187 | PDF Full-text (312 KB)
Abstract
One of the greatest goals in medicine is early-stage detection of tumors, to allow physicians and surgeons to apply the available therapies, which are usually successful on small volume cancers only. [...] Full article
Open AccessExtended Abstract
Metal Oxide Sensors Applied to Industrial and Consumer Applications: Examples and Requirements for Successful Implementation
Published: 19 June 2019
Viewed by 165 | PDF Full-text (135 KB)
Abstract
Metal Oxide (MOx) sensors have been the subject of intense research and development over the
years, and are widely used in industrial and commercial sensing applications [...] Full article
Open AccessExtended Abstract
SnO2-Based Gas Sensor for Detection of Refrigerant Gases
Published: 19 June 2019
Viewed by 168 | PDF Full-text (274 KB)
Abstract
The Montreal Protocol on Substances that Deplete the Ozone Layer entered into force in 1989. […] Full article
Open AccessExtended Abstract
Nanostructured Chemoresistive Sensors for Oncological Screening: Preliminary Study with Single Sensor Approach on Human Blood Samples
Published: 19 June 2019
Viewed by 163 | PDF Full-text (620 KB)
Abstract
The demand for reliable devices to detect tumor biomarkers in human body is constantly
increasing [...] Full article
Open AccessExtended Abstract
High Temperature Resistive Gas Sensors Based on ZnO/SiC Nanocomposites
Published: 19 June 2019
Viewed by 174 | PDF Full-text (405 KB)
Abstract
The work is aimed at creating ZnO/SiC composites for resistive type gas sensors towards main
components of exhaust gases [...] Full article
Open AccessExtended Abstract
Light—Assisted Low Temperature Formaldehyde Detection at Sub-ppm Level Using Metal Oxide Semiconductor Gas Sensors
Published: 19 June 2019
Viewed by 176 | PDF Full-text (1326 KB)
Abstract
Formaldehyde HCOH is a toxic compound that, in trace concentrations, causes serious diseases
of the respiratory tract, gastrointestinal tract and eyes [...] Full article
Open AccessExtended Abstract
MOX Sensors to Ensure Suitable Parameters of Grated Parmigiano Reggiano Cheese
Published: 19 June 2019
Viewed by 170 | PDF Full-text (200 KB)
Abstract
Parmigiano Reggiano (PR) cheese is a long-ripened hard cheese made in Northern Italy registered as a Protected Designation of Origin (PDO) in the European Union. [...] Full article
Open AccessExtended Abstract
Sensing Performance of Al and Sn Doped ZnO for Hydrogen Detection
Published: 19 June 2019
Viewed by 191 | PDF Full-text (161 KB)
Abstract
Chemical gas sensors were studied long ago and nowadays, for the advantageous role they provide to the environment, health condition monitoring and protection. The recent studies focus on the semiconductors sensing abilities, especially of non toxic and low cost compounds. The present work [...] Read more.
Chemical gas sensors were studied long ago and nowadays, for the advantageous role they provide to the environment, health condition monitoring and protection. The recent studies focus on the semiconductors sensing abilities, especially of non toxic and low cost compounds. The present work describes the steps to elaborate and perform a chemical sensor using intrinsic and doped semiconductor zinc oxide. First, we synthesized pure oxide using zinc powder, then, two other samples were established where we introduced the same doping percentage of Al and Sn respectively. Using low cost spray pyrolysis, and respecting the same conditions of preparation. The obtained samples were then characterized by X Ray Diffraction (XRD) that revealed the hexagonal wurzite structure and higher crystallite density towards the direction (002), besides the appearance of the vibration modes related to zinc oxide, confirmed by Raman spectroscopy. SEM spectroscopy showed that the surface morphology is ideal for oxidizing/reduction reactions, due to the porous structure and the low grain sizes, especially observed for the sample Sn doped ZnO. The gas testing confirms these predictions showing that the highest response is related to Sn doped ZnO compared to ZnO and followed by Al doped ZnO. The films exhibited responses towards: CO, acetone, methanol, H2, ammonia and NO2. The concentrations were varied from 10 to 500 ppm and the working temperatures from 250 to 500°C, the optimal working temperatures were 350 and 400 °C. Sn doped ZnO showed a high response towards H2 gas target, with a sensitivity reaching 200 at 500 ppm, for 400 °C. Full article
Open AccessExtended Abstract
Flexible Gas Sensor Printed on Polymer Substrate for Acetone Detection in Portable Exhaled Breath Analyzers
Published: 19 June 2019
Viewed by 182 | PDF Full-text (629 KB)
Abstract
Gas detectors have constantly been developed over the few last decades as a result of
industrial demands: for monitoring air quality [...] Full article
Open AccessExtended Abstract
Nanocrystalline LaCoO3 Modified by Ag Nanoparticles with Improved Sensitivity to H2S
Published: 19 June 2019
Viewed by 171 | PDF Full-text (330 KB)
Abstract
Nanocrystalline LaCoO3 was synthesized by sol-gel method and functionalized by Ag
nanoparticles via impregnation [...] Full article
Open AccessExtended Abstract
Investigation of the Film Thickness Influence on the Sensor Response of In2O3-Based Sensors for O3 Detection at Low Temperature and Operando DRIFT Study
Published: 19 June 2019
Viewed by 207 | PDF Full-text (268 KB)
Abstract
Industrial pollution and traffic emissions emit dangerous amounts of O3, NO2, VOCs and PM into environment, bringing higher incidence of morbidity and mortality in respiratory sicknesses [1]. [...] Full article
Open AccessExtended Abstract
Gas Sensing Mechanism Investigation of LaFeO3 Perovskite-Type Oxides via Operando Technique
Published: 19 June 2019
Viewed by 193 | PDF Full-text (565 KB)
Abstract
Gas sensor based on perovskites, such as LaFeO3 (LFO), have been used successfully to detect various target gases [1,2]. […] Full article
Open AccessExtended Abstract
Work Function Measurements in Single-Crystalline In2O3 for Conduction Modelling
Published: 23 June 2019
Viewed by 279 | PDF Full-text (478 KB)
Abstract
To date, there are only a few studies on the gas sensing properties of single crystalline sensors. […] Full article
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