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Topical Collection "Gas Sensors"

Editor

Collection Editor
Prof. Dr. Giovanni Neri

Department of Electronic Engineering, Chemistry and Industrial Engineering, University of Messina, 98166 Messina, Italy
Website | E-Mail
Fax: +39 090 397 7464
Interests: chemical synthesis of sensing materials; oxide semiconductor-based gas sensors; nanostructures for chemical and electrochemical sensing; automotive gas sensors; biomedical sensors

Topical Collection Information

Dear Colleagues,

Gas sensors play an important role in many aspects of technology, in fields such as industrial processes, automotive technologies, environmental monitoring, or air quality assurance, to name just a few, and are increasingly becoming part of our day-to-day lives at work and home. Today’s devices exploit numerous solid-state, electrochemical, optical and other phenomena related to gas sensing. Research and development of gas sensor devices continue to be faced with numerous challenges in terms of sensitivity, selectivity, stability, and many other aspects. Thus, while the fundamental understanding of underlying sensing processes continues to improve, the discovery of novel functional sensing materials open up new opportunities, the format/architecture of gas sensors is rapidly changing. In recent decades, the evolution of sensors has been strongly influenced by ICT technologies, with integration of microcontrollers, wireless communications modules, and permanent data storage. New sensing technology platforms provide the ability to monitor, control, optimize, and provide autonomy to smart, connected devices, enabled by advances in component miniaturization, microelectromechanical systems (MEMS), low-power devices, onboard processing, and Internet-connected “cloud” computing.  

This Topical Collection on 'Gas Sensors' aims to cover the above-mentioned aspects regarding gas sensors. Key issues, such as the developments of novel gas sensing materials, new insights in gas sensing mechanisms, new devices and fabrication technologies, testing and characterization of micro- and nano-fabricated systems for gas sensing, are, therefore, collected together to give an overview of the recent fundamental and applied research carried out in this field. Topics covered are:

  • Gas sensing materials
  • Principles and phenomena of gas sensing
  • Gas-sensing mechanisms
  • Gas sensor technologies
  • Micro- and nanofabrication
  • Applications

Prof. Dr. Giovanni Neri
Collection Editor

Submission

Manuscripts should be submitted online at www.mdpi.com by registering and logging in to this website. Once you are registered, click here to go to the submission form. Papers will be published continuously (as soon as accepted) and will be listed together on the collection website. Research articles, review articles as well as communications are invited. For planned papers, a title and short abstract (about 100 words) can be sent to the Editorial Office for announcement on this website.

Submitted manuscripts should not have been published previously, nor be under consideration for publication elsewhere (except conference proceedings papers). All manuscripts are refereed through a peer-review process. A guide for authors and other relevant information for submission of manuscripts is available on the Instructions for Authors page. Sensors is an international peer-reviewed Open Access monthly journal published by MDPI.

Please visit the Instructions for Authors page before submitting a manuscript. The Article Processing Charge (APC) for publication in this open access journal is 1800 CHF (Swiss Francs).

Published Papers (3 papers)

2017

Open AccessArticle Ratiometric Dissolved Oxygen Sensors Based on Ruthenium Complex Doped with Silver Nanoparticles
Sensors 2017, 17(3), 548; doi:10.3390/s17030548
Received: 28 December 2016 / Revised: 19 February 2017 / Accepted: 6 March 2017 / Published: 9 March 2017
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Abstract
A ratiometric optical sensor has been developed with electrospinning processing method for dissolved oxygen measurement. The sensing film is fabricated by using silver nano-particles (Ag NPs) doped with tris(4,7-diphenyl-1,10-phenanthroline) ruthenium(II) dichloride complex (Ru(DPP)3Cl2) encapsulated in plasticized polymethyl methacrylate (PMMA).
[...] Read more.
A ratiometric optical sensor has been developed with electrospinning processing method for dissolved oxygen measurement. The sensing film is fabricated by using silver nano-particles (Ag NPs) doped with tris(4,7-diphenyl-1,10-phenanthroline) ruthenium(II) dichloride complex (Ru(DPP)3Cl2) encapsulated in plasticized polymethyl methacrylate (PMMA). An insensitive 3-(2-benzothiazolyl)-7-(diethy lamino)-(6CI,7CI) (Coumarin6) is adopted as reference. The ratio of oxygenation is calculated at each image pixel of a 3CCD camera to quantify the oxygen concentration in aqueous environment. Compared to Ag-free film, the response time of Ag-containing films were improved from 1.5 s to 1.0 s upon switching from deoxygenated to air saturation and from 65 s to 45 s from air saturation to fully deoxygenated. The response times of the Ag-free film obtained by knifing was 2.0 s upon switching from deoxygenated to air saturation and 104 s from air saturation to fully deoxygenated. Results of the evaluation of accuracy, limit of detection, stability, and photostability are presented. An experiment measuring the spatiotemporal variation of oxygen distribution within the photosynthesis and respiration of Chlorella vulgaris is demonstrated. It is shown that the nanofiber-based optical sensor film could serve as a promising method for rapid oxygen monitoring in aqueous applications. Full article
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Open AccessArticle Comparative Study of Different Methods for Soot Sensing and Filter Monitoring in Diesel Exhausts
Sensors 2017, 17(2), 400; doi:10.3390/s17020400
Received: 20 November 2016 / Revised: 29 January 2017 / Accepted: 11 February 2017 / Published: 18 February 2017
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Abstract
Due to increasingly tighter emission limits for diesel and gasoline engines, especially concerning particulate matter emissions, particulate filters are becoming indispensable devices for exhaust gas after treatment. Thereby, for an efficient engine and filter control strategy and a cost-efficient filter design, reliable technologies
[...] Read more.
Due to increasingly tighter emission limits for diesel and gasoline engines, especially concerning particulate matter emissions, particulate filters are becoming indispensable devices for exhaust gas after treatment. Thereby, for an efficient engine and filter control strategy and a cost-efficient filter design, reliable technologies to determine the soot load of the filters and to measure particulate matter concentrations in the exhaust gas during vehicle operation are highly needed. In this study, different approaches for soot sensing are compared. Measurements were conducted on a dynamometer diesel engine test bench with a diesel particulate filter (DPF). The DPF was monitored by a relatively new microwave-based approach. Simultaneously, a resistive type soot sensor and a Pegasor soot sensing device as a reference system measured the soot concentration exhaust upstream of the DPF. By changing engine parameters, different engine out soot emission rates were set. It was found that the microwave-based signal may not only indicate directly the filter loading, but by a time derivative, the engine out soot emission rate can be deduced. Furthermore, by integrating the measured particulate mass in the exhaust, the soot load of the filter can be determined. In summary, all systems coincide well within certain boundaries and the filter itself can act as a soot sensor. Full article
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Open AccessArticle Highly Sensitive Sensors Based on Metal-Oxide Nanocolumns for Fire Detection
Sensors 2017, 17(2), 303; doi:10.3390/s17020303
Received: 21 November 2016 / Revised: 18 January 2017 / Accepted: 3 February 2017 / Published: 7 February 2017
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Abstract
A fire detector is the most important component in a fire alarm system. Herein, we present the feasibility of a highly sensitive and rapid response gas sensor based on metal oxides as a high performance fire detector. The glancing angle deposition (GLAD) technique
[...] Read more.
A fire detector is the most important component in a fire alarm system. Herein, we present the feasibility of a highly sensitive and rapid response gas sensor based on metal oxides as a high performance fire detector. The glancing angle deposition (GLAD) technique is used to make the highly porous structure such as nanocolumns (NCs) of various metal oxides for enhancing the gas-sensing performance. To measure the fire detection, the interface circuitry for our sensors (NiO, SnO2, WO3 and In2O3 NCs) is designed. When all the sensors with various metal-oxide NCs are exposed to fire environment, they entirely react with the target gases emitted from Poly(vinyl chlorides) (PVC) decomposed at high temperature. Before the emission of smoke from the PVC (a hot-plate temperature of 200 °C), the resistances of the metal-oxide NCs are abruptly changed and SnO2 NCs show the highest response of 2.1. However, a commercial smoke detector did not inform any warning. Interestingly, although the NiO NCs are a p-type semiconductor, they show the highest response of 577.1 after the emission of smoke from the PVC (a hot-plate temperature of 350 °C). The response time of SnO2 NCs is much faster than that of a commercial smoke detector at the hot-plate temperature of 350 °C. In addition, we investigated the selectivity of our sensors by analyzing the responses of all sensors. Our results show the high potential of a gas sensor based on metal-oxide NCs for early fire detection. Full article
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