Emerging Applications of Gas Sensors Based on Metal Oxides

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

Deadline for manuscript submissions: closed (15 May 2022) | Viewed by 2918

Special Issue Editors


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Guest Editor
College of Physics, Qingdao University, Qingdao 266071, China
Interests: metal oxide nanostructures; gas sensors; thin films; exhaled breath diagnosis; micro-device fabrication

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Guest Editor
Department of Engineering, University of Messina, 98166 Messina, Italy
Interests: sensor development and characterization; sensor- based measurement systems; microwave characterization; biomedical sensors; gas sensor for health care and environmental monitoring
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Special Issue Information

Dear Colleagues,

Gas sensors are essential devices in the sensor networks and Internet of things (IoT) applications. They also hold great promise in some emerging areas such as exhaled breath diagnosis, in addition to the detection of harmful, toxic and flammable gaseous molecules. Metal oxide semiconductor (MOx) nanostructures have been widely investigated as sensing layers in gas sensors, due to their high surface area to volume ratio, low cost, easy synthesis, and facile processing. Propelled by the advances of nanoscience and nanotechnology, a vast number of sensors have been developed from MOx such as SnO2, ZnO, WO3, In2­O3, etc. Great efforts have also been explored to develop strategies to optimize the sensing performance of MOx-based sensors towards detection in higher sensitivity, better selectivity, and lower power consumption. Currently, gas sensors are expected to be integrated into wearable and portable devices to realize more functionalities besides detection. To highlight the important progresses made in MOx sensors, the journal Chemosensors is going to publish a Special Issue on “Emerging Applications of Gas Sensors Based on Metal Oxides”. This Special Issue is seeking submission of papers focused on the synthesis and characterization of various metal oxide nanomaterials and their emerging application to gas sensors that are targeted for efficient biomarker detection, low power consumption, wireless application, or flexibility. Papers regarding the characterization and the metrological evaluation of the sensing performance, towards specific applications, are also warmly welcome.

Dr. Xianghong Liu
Prof. Dr. Nicola Donato
Guest Editors

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Keywords

  • metal oxide
  • gas sensor
  • nanostructures
  • thin films
  • sensitivity
  • exhaled breath diagnosis
  • biomarker detection
  • low-power sensors
  • selectivity
  • volatile organic compounds
  • characterization and metrological evaluation

Published Papers (1 paper)

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Research

16 pages, 4277 KiB  
Article
Insights about CO Gas-Sensing Mechanism with NiO-Based Gas Sensors—The Influence of Humidity
by Cristian E. Simion, Corneliu Ghica, Catalina G. Mihalcea, Daniela Ghica, Ionel Mercioniu, Simona Somacescu, Ovidiu G. Florea and Adelina Stanoiu
Chemosensors 2021, 9(9), 244; https://doi.org/10.3390/chemosensors9090244 - 01 Sep 2021
Cited by 12 | Viewed by 2298
Abstract
Polycrystalline NiO thick film-based gas sensors have been exposed to different test gas atmospheres at 250 °C and measured via simultaneous electrical resistance and work function investigations. Accordingly, we decoupled different features manifested toward the potential changes, i.e., work function, band-bending, and electron [...] Read more.
Polycrystalline NiO thick film-based gas sensors have been exposed to different test gas atmospheres at 250 °C and measured via simultaneous electrical resistance and work function investigations. Accordingly, we decoupled different features manifested toward the potential changes, i.e., work function, band-bending, and electron affinity. The experimental results have shown that the presence of moisture induces an unusual behavior toward carbon monoxide (CO) detection by considering different surface adsorption sites. On this basis, we derived an appropriate detection mechanism capable of explaining the lack of moisture influence over the CO detection with NiO-sensitive materials. As such, CO might have both chemical and dipolar interactions with pre-adsorbed or lattice oxygen species, thus canceling out the effect of moisture. Additionally, morphology, structure, and surface chemistry were addressed, and the results have been linked to the sensing properties envisaging the role played by the porous quasispherical–hollow structures and surface hydration. Full article
(This article belongs to the Special Issue Emerging Applications of Gas Sensors Based on Metal Oxides)
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