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Micromachines
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Gas Sensors: From Fundamental Research to Applications, 2nd Edition
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Gas Sensors: From Fundamental Research to Applications, 2nd Edition

A special issue of Micromachines (ISSN 2072-666X). This special issue belongs to the section "C：Chemistry".

Deadline for manuscript submissions: 31 May 2026 | Viewed by 4123

Special Issue Editor

Dr. Pengfei Cheng

E-Mail Website
Guest Editor
School of Aerospace Science and Technology, Xidian University, Xi’an 710126, China
Interests: gas micro-nano sensors; semiconductor oxide gas sensors; health monitoring; atmospheric monitoring; portable devices; IoT applications
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

Gas sensors are devices that can detect the composition of gases in the air, and they are widely used in fields such as environmental monitoring, safety monitoring, healthcare and industrial control. Gas sensors work on a variety of principles, and some of the most common include electrochemical, semiconductor and infrared sensors. Electrochemical sensors use the principle of electrochemical reaction to react gas with electrodes to generate current signals. Semiconductor sensors detect fluctuations in semiconductor conductivity with changing gas concentrations. Infrared sensors, on the other hand, determine the gas concentration by measuring the infrared radiation generated through the vibration of gas molecules.

Gas sensors have high sensitivity and accuracy and are capable of detecting very low concentrations of gases. Moreover, gas sensors have a fast response time and can monitor changes in gas concentration in real time. In addition, gas sensors have good selectivity and stability, enabling the accurate detection of specific gases in complex environments.

However, gas sensors have some limitations. For example, they are susceptible to environmental factors such as temperature and humidity and may exhibit cross-talk for certain gases, resulting in inaccurate detection results.

In conclusion, gas sensors are important and practical detection devices that can help us to better understand and control the gas composition in the air, protect human health and safety and improve industrial production. With the development of science and technology, the performance of gas sensors in terms of factors such as sensitivity, accuracy and response speed will continue to improve and their field of application will continue to expand.

We look forward to receiving your submissions.

Dr. Pengfei Cheng
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 250 words) can be sent to the Editorial Office for assessment.

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. Micromachines 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 2100 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

  • gas sensors
  • MEMS sensor arrays
  • gas sensors device applications
  • electronic nose system
  • micro- and nano-preparation
  • micro-control
  • semiconductor crystal structure

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Published Papers (2 papers)

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26 pages, 38465 KB  
Article
High-Resolution Snapshot Multispectral Imaging System for Hazardous Gas Classification and Dispersion Quantification
by Zhi Li, Hanyuan Zhang, Qiang Li, Yuxin Song, Mengyuan Chen, Shijie Liu, Dongjing Li, Chunlai Li, Jianyu Wang and Renbiao Xie
Micromachines 2026, 17(1), 112; https://doi.org/10.3390/mi17010112 - 14 Jan 2026
Viewed by 435
Abstract
Real-time monitoring of hazardous gas emissions in open environments remains a critical challenge. Conventional spectrometers and filter wheel systems acquire spectral and spatial information sequentially, which limits their ability to capture multiple gas species and dynamic dispersion patterns rapidly. A High-Resolution Snapshot Multispectral [...] Read more.
Real-time monitoring of hazardous gas emissions in open environments remains a critical challenge. Conventional spectrometers and filter wheel systems acquire spectral and spatial information sequentially, which limits their ability to capture multiple gas species and dynamic dispersion patterns rapidly. A High-Resolution Snapshot Multispectral Imaging System (HRSMIS) is proposed to integrate high spatial fidelity with multispectral capability for near real-time plume visualization, gas species identification, and concentration retrieval. Operating across the 7–14 μm spectral range, the system employs a dual-path optical configuration in which a high-resolution imaging path and a multispectral snapshot path share a common telescope, allowing for the simultaneous acquisition of fine two-dimensional spatial morphology and comprehensive spectral fingerprint information. Within the multispectral path, two 5×5 microlens arrays (MLAs) combined with a corresponding narrowband filter array generate 25 distinct spectral channels, allowing concurrent detection of up to 25 gas species in a single snapshot. The high-resolution imaging path provides detailed spatial information, facilitating spatio-spectral super-resolution fusion for multispectral data without complex image registration. The HRSMIS demonstrates modulation transfer function (MTF) values of at least 0.40 in the high-resolution channel and 0.29 in the multispectral channel. Monte Carlo tolerance analysis confirms imaging stability, enabling the real-time visualization of gas plumes and the accurate quantification of dispersion dynamics and temporal concentration variations. Full article
(This article belongs to the Special Issue Gas Sensors: From Fundamental Research to Applications, 2nd Edition)
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15 pages, 4979 KB  
Article
Etched Tungsten Oxide Modified with Au for Quick Xylene Detection
by Yinglin Wang, Zhaohui Lei, Xu Li, Yantong Meng, Wanting Cui, Yiyang Xu, Xidong Hao, Shanfu Sun and Pengfei Cheng
Micromachines 2025, 16(6), 646; https://doi.org/10.3390/mi16060646 - 28 May 2025
Viewed by 944
Abstract
Due to its widespread distribution in industrial, commercial, and residential settings, xylene detection is crucial. In this study, carbon sphere templates and NaHCO3 etching were used to synergistically prepare WO3 with uniform macropores, which was then decorated with Au elements. The [...] Read more.
Due to its widespread distribution in industrial, commercial, and residential settings, xylene detection is crucial. In this study, carbon sphere templates and NaHCO3 etching were used to synergistically prepare WO3 with uniform macropores, which was then decorated with Au elements. The findings demonstrated that the Au-decorated WO3-etched sample (WO3-1%E+Au) had the best sensing performance for 100 ppm xylene (response value: 21.3, optimal operating temperature: 360 °C) and short response/recovery time (1 s/11 s). The etching of NaHCO3 and the synergistic carbon sphere templates were responsible for the sensing performance, as they enhanced the sample surface’s specific surface area and roughness while also supplying additional active sites. Furthermore, the sensor’s sensitivity and selectivity to xylene were enhanced by the coupling effect and dehydrogenation catalysis of the noble metal Au. The results of this work advance our knowledge of gas-sensing mechanisms and offer guidance for the creation of extremely sensitive and selective xylene gas sensors. Full article
(This article belongs to the Special Issue Gas Sensors: From Fundamental Research to Applications, 2nd Edition)
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