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Chemosensors
Special Issues
Recent Advances in Metal Oxide-Based Gas Sensors
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Recent Advances in Metal Oxide-Based Gas Sensors

A special issue of Chemosensors (ISSN 2227-9040). This special issue belongs to the section "Nanostructures for Chemical Sensing".

Deadline for manuscript submissions: 31 August 2024 | Viewed by 3425

Special Issue Editor

Dr. Timothy A Vincent

E-Mail Website
Guest Editor
WMG, University of Warwick, Coventry CV4 7AL, UK
Interests: smart batteries; gas sensing; battery instrumentation; metal oxide sensing

Special Issue Information

Dear Colleagues,

Metal oxide gas sensors are ideally placed for long-term, cost-effective applications and are incredibly useful in applications such as safety, environmental monitoring, and medical devices. Coupling these principles with desired low maintenance, excellent selectivity, fast response, and scalable production can present challenges to the adoption of metal oxide sensors beyond their traditional applications.

This Special Issue welcomes articles discussing all aspects of metal oxide gas sensor research. Sensing layer material research and development are fundamental to expand the possible measurand gases, while tuning selectivity and reliability. Articles detailing experimental or theoretical development of novel sensing materials are invited. Additionally, demonstration of progress overcoming sensing layer challenges such as the degradation or poisoning of the material in harsh applications is an area of great interest.

Miniaturization of these sensors and construction of multielement arrays accelerate the drive to integrate metal oxide sensors within portable devices. Selectivity and repeatability within a varied gas environment are crucial. Testing and deployment of systems in unique environments and applications are vital to secure metal oxide technology in the next generation of smart devices.

Signal processing, algorithm optimization, and electronic circuitry development facilitate enhanced sensing performance. Articles relating to data processing, such as techniques to interface sensors, extract key features from response data, or improve electronic performance are welcomed.

We invite both original research articles and review papers to be submitted for consideration.

Dr. Timothy A Vincent
Guest Editor

Manuscript Submission Information

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. Manuscripts can be submitted until the deadline. All submissions that pass pre-check are peer-reviewed. Accepted papers will be published continuously in the journal (as soon as accepted) and will be listed together on the special issue website. Research articles, review articles as well as short 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 thoroughly refereed through a single-blind peer-review process. A guide for authors and other relevant information for submission of manuscripts is available on the Instructions for Authors page. Chemosensors 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 2700 CHF (Swiss Francs). Submitted papers should be well formatted and use good English. Authors may use MDPI's English editing service prior to publication or during author revisions.

Keywords

  • materials for metal oxide gas sensors
  • signal processing techniques for sensing applications
  • novel applications of metal oxide sensors
  • air quality analysis and environmental monitoring
  • sensors for electronic noses
  • VOC sensing
  • sensor signal analysis
  • information processing and algorithm development
  • machine learning with mox sensors
  • sensor array optimization
  • remote sensing and wireless technologies
  • gas plume mapping and tracking
  • gas sensing for automotive and energy storage applications

Published Papers (2 papers)

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Research

21 pages, 12863 KiB  
Article
Gas Sensing Properties of CuWO4@WO3 n-n Heterojunction Prepared by Direct Hydrolysis of Mesitylcopper (I) on WO3·2H2O Nanoleaves
by Justyna Jońca, Kevin Castello-Lux, Katia Fajerwerg, Myrtil L. Kahn, Vincent Collière, Philippe Menini, Izabela Sówka and Pierre Fau
Chemosensors 2023, 11(9), 495; https://doi.org/10.3390/chemosensors11090495 - 9 Sep 2023
Viewed by 1088
Abstract
The nanometer size Cu2O@WO3·H2O composite material has been prepared by the direct hydrolysis of mesitylcopper (I) on WO3·2H2O nanoleaves. The synthesis has been performed in toluene without the addition of any ancillary ligands. [...] Read more.
The nanometer size Cu2O@WO3·H2O composite material has been prepared by the direct hydrolysis of mesitylcopper (I) on WO3·2H2O nanoleaves. The synthesis has been performed in toluene without the addition of any ancillary ligands. The prepared nanocomposite has been deposited as a gas-sensitive layer on miniaturized silicon devices and heated up gradually to 500 °C in the ambient air. During the heating, the CuWO4 phase is formed upon the reaction of Cu2O with the WO3 support as revealed by the XRD analyses. The as-prepared CuWO4@WO3 sensors have been exposed to 10 ppm of CO or 0.4 ppm of NO2 (RH = 50%). At the operating temperature of 445 °C, a normalized response of 620% towards NO2 is obtained whereas the response to CO is significantly lower (S = 30%). Under these conditions, the sensors prepared either with pristine CuO or WO3 nanostructures are sensitive to only one of the two investigated gases, i.e., CO and NO2, respectively. Interestingly, when the CuWO4@WO3 sensitive layer is exposed to UV light emitted from a 365 nm Schottky diode, its sensitivity towards CO vanishes whereas the response towards NO2 remains high. Thus, the application of UV illumination allowed us to modify the selectivity of the device. This new nanocomposite sensor is a versatile sensitive layer that will be integrated into a gas sensor array dedicated to electronic nose platforms. Full article
(This article belongs to the Special Issue Recent Advances in Metal Oxide-Based Gas Sensors)
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18 pages, 8940 KiB  
Article
An Alternative Approach for the Synthesis of Zinc Aluminate Nanoparticles for CO and Propane Sensing Applications
by Lorenzo Gildo-Ortiz, Verónica-María Rodríguez-Betancourtt, Jorge Alberto Ramírez Ortega and Oscar Blanco-Alonso
Chemosensors 2023, 11(2), 105; https://doi.org/10.3390/chemosensors11020105 - 2 Feb 2023
Cited by 2 | Viewed by 1746
Abstract
We implemented a simple and inexpensive aqueous sol-gel process to synthesize ZnAl2O4 nanoparticles to study its potential application as a gas sensor. Compared to traditional ceramic methods, the synthesis was conducted at lower temperatures and reaction times (5 h from [...] Read more.
We implemented a simple and inexpensive aqueous sol-gel process to synthesize ZnAl2O4 nanoparticles to study its potential application as a gas sensor. Compared to traditional ceramic methods, the synthesis was conducted at lower temperatures and reaction times (5 h from 200 °C). The crystalline evolution of the oxide was investigated. The effect of the calcination temperature (200–1000 °C) on the crystallites’ size (16–29 nm) and the ZnAl2O4 powder’s surface morphology was also analyzed. Measurements confirmed the formation of bar-shaped granules (~0.35 μm) made up of nanoparticles (~23 nm). The surface area of the powders was 60 m2/g. Pellets were made from the powders and tested in sensing carbon monoxide and propane gases, showing a high sensitivity to such gases. The sensor’s response increased with increasing temperature (25–300 °C) and gas concentration (0–300 ppm). The oxide showed a higher response in propane than in carbon monoxide. We concluded that the ZnAl2O4 is a good candidate for gas sensing applications. Full article
(This article belongs to the Special Issue Recent Advances in Metal Oxide-Based Gas Sensors)
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