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Advances in Gas Sensors and their Application

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

Deadline for manuscript submissions: closed (30 May 2025) | Viewed by 4968

Special Issue Editors


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Guest Editor
School of Optical and Electronic Information, Huazhong University of Science and Technology, Wuhan, China
Interests: gas sensor; electronic nose

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Guest Editor
Division of Advanced Materials Engineering, Jeonbuk National University, Jeonju 54896, Republic of Korea
Interests: nanostructured gas sensor
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

Gas sensors are widely used for many reasons, such as environmental monitoring, toxic gas monitoring, food analysis, exhaled human breath analysis, etc. Many methods have been used to enhance their performance, e.g., doping, nanostructures, heterojunctions, etc. Various novel materials have been adopted, such as CNT, MOF, COF, and MXene, and several new types have recently been invented, including light-activated transducers, field-effect transducers, MEMS, etc. Combining different gas sensors into an array to form an electronic nose enables the differentiation of complex odors.

This Special Issue aims to highlight the recent advances and applications of gas sensors. Therefore, authors are invited to submit work related to novel materials, sensor structures, mechanism studies, and applications. Both review articles and research papers are welcome.

Gas sensors is a classic topic within the scope of Chemosensors. This topic aims to highlight the advances and applications of semiconductor gas sensors, which may be of interest to readers.

Dr. Huayao Li
Dr. Ji-Wook Yoon
Guest Editors

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Keywords

  • gas sensors
  • Semiconductor Sensors
  • novel materials, sensor structures, mechanism studies, and applications

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Published Papers (2 papers)

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Research

11 pages, 2452 KiB  
Article
Effects of Au Addition to Porous CuO2-Added SnO2 Gas Sensors on Their VOC-Sensing Properties
by Taro Ueda, Soichiro Torai, Koki Fujita, Yasuhiro Shimizu and Takeo Hyodo
Chemosensors 2024, 12(8), 153; https://doi.org/10.3390/chemosensors12080153 - 6 Aug 2024
Cited by 2 | Viewed by 1270
Abstract
The effects of Au addition on the acetone response of Cu2O-added porous SnO2 (pr-Cu2O-SnO2) powders, which were synthesized by ultrasonic spray pyrolysis employing polymethyl methacrylate microspheres as a template, were investigated in this study. The 3.0 [...] Read more.
The effects of Au addition on the acetone response of Cu2O-added porous SnO2 (pr-Cu2O-SnO2) powders, which were synthesized by ultrasonic spray pyrolysis employing polymethyl methacrylate microspheres as a template, were investigated in this study. The 3.0 wt% Au-added pr-Cu2O-SnO2 sensor showed the largest acetone response among all sensors. In addition, the magnitude of the acetone response was much larger than those of the ethanol and toluene responses. The catalytic activities of these gases over Au-added pr-Cu2O-SnO2 powders were also examined to clarify the key factors affecting their acetone-sensing properties. The Au addition increased the complete oxidation activity of all gases, and the complete oxidation activity of acetone was much higher than those of ethanol and toluene. These results indicate that the oxidation behavior during the gas-diffusion process in the sensitive Au-added pr-Cu2O-SnO2 layer of the sensors is quite important in enhancing the acetone-sensing properties. Full article
(This article belongs to the Special Issue Advances in Gas Sensors and their Application)
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23 pages, 4831 KiB  
Article
Influence of pH on Room-Temperature Synthesis of Zinc Oxide Nanoparticles for Flexible Gas Sensor Applications
by Fazia Mechai, Ahmad Al Shboul, Mohand Outahar Bensidhoum, Hossein Anabestani, Mohsen Ketabi and Ricardo Izquierdo
Chemosensors 2024, 12(5), 83; https://doi.org/10.3390/chemosensors12050083 - 16 May 2024
Cited by 2 | Viewed by 2656
Abstract
This research contributes to work on synthesizing zinc oxide nanoparticles (ZnO NPs) at room temperature (RT) and their utilization in flexible gas sensors. RT ZnO NP synthesis with a basicity solution (pH ≈ 13) demonstrates an efficient method for synthesizing well-crystalline ZnO NPs [...] Read more.
This research contributes to work on synthesizing zinc oxide nanoparticles (ZnO NPs) at room temperature (RT) and their utilization in flexible gas sensors. RT ZnO NP synthesis with a basicity solution (pH ≈ 13) demonstrates an efficient method for synthesizing well-crystalline ZnO NPs (RT.pH13) comparable to those synthesized by the hydrothermal method (hyd.C). The RT.pH13 achieved a high thermal stability with minimal organic reside impurities (~4.2 wt%), 30–80 nm particle size distribution, and a specific surface area (14 m2 g−1). The synthesized pre- and post-calcinated RT.pH13 NPs were then incorporated into flexible sensors for gas sensing applications at ambient conditions (RT and relative humidity of 30–50%). The pre-calcinated ZnO-based sensor (RT.pH13) demonstrated superior sensitivity to styrene and acetic acid and lower sensitivity to dimethyl-6-octenal. The calcinated ZnO-based sensor (RT.pH13.C) exhibited lower sensitivity to styrene and acetic acid, but heightened sensitivity to benzene, acetone, and ethanol. This suggests a correlation between sensitivity and structural transformations following calcination. The investigation of the sensing mechanisms highlighted the role of surface properties in the sensors’ affinity for specific gas molecules and temperature and humidity variations. The study further explored the sensors’ mechanical flexibility, which is crucial for flexible Internet of Things (IoT) applications. Full article
(This article belongs to the Special Issue Advances in Gas Sensors and their Application)
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