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Gas Sensors: Materials, Mechanisms and Applications: 2nd Edition
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Gas Sensors: Materials, Mechanisms and Applications: 2nd Edition

A special issue of Sensors (ISSN 1424-8220). This special issue belongs to the section "Chemical Sensors".

Deadline for manuscript submissions: closed (25 February 2026) | Viewed by 6814

Special Issue Editor

Dr. Tingqiang Yang

E-Mail Website
Guest Editor
Institute of Sensor and Actuator Systems, TU Wien, Gusshausstrasse 27–29, 1040 Vienna, Austria
Interests: gas sensors; semiconducting metal oxides; density functional theory; surface chemistry
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

Gas sensors with high sensitivity, excellent selectivity, good stability, low power consumption, low detection limits, and low cost are a goal of most researchers in this field. As a type of chemical sensor, sensitive materials play a key role in gas-sensing performance in most cases, except for some optical gas sensors. Deepening our understanding of gas-sensing mechanisms is necessary to improve or optimize such sensors’ performance. Only with more reliable performance will gas sensors draw increased attention and be applied to different areas.

This Special Issue aims to collect research and review papers reporting on recent progress in materials utilized in different types of gas sensors, including novel synthesis methods, morphology control, doping, and functionalization. New experimental and theoretical insights into gas-sensing mechanisms are particularly welcome. Developments in applications of gas sensors also fall within the scope of this issue.

Dr. Tingqiang Yang
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. Sensors is an international peer-reviewed open access semimonthly 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 2600 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
  • nanomaterials
  • semiconducting metal oxides
  • polymers
  • gas-sensing mechanism
  • gas absorption
  • gas sensor applications

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Published Papers (4 papers)

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Research

13 pages, 3719 KB  
Article
Low-Temperature Ethanol Gas Sensor Based on MoO3/Nb2C MXene Composite via Crystal Engineering and Facet Release
by Baohui Zhang, Haoyu Zhou, Xiaowu Zhu, Haoxiang Chen and Yang Yang
Sensors 2026, 26(11), 3450; https://doi.org/10.3390/s26113450 - 29 May 2026
Abstract
High-performance ethanol sensors with low power consumption show critical applications in environmental monitoring, personal health diagnosis, industry and traffic safety. Herein, MoO3/Nb2C MXene heterojunction gas-sensing materials were constructed via a one-step hydrothermal method for MoO3 nanotube synthesis. The [...] Read more.
High-performance ethanol sensors with low power consumption show critical applications in environmental monitoring, personal health diagnosis, industry and traffic safety. Herein, MoO3/Nb2C MXene heterojunction gas-sensing materials were constructed via a one-step hydrothermal method for MoO3 nanotube synthesis. The dominant facets of MoO3 were shifted from the (040) orientation in MoO3 nanotubes to the (110) and (021) orientations in the MoO3/Nb2C MXene composite. Nb2C nanosheets provide a large number of crystallization sites, preventing the growth of MoO3 nanotubes during synthesis, inducing a strategic facet release. The sensing performance shows MoO3/Nb2C MXene composite reduces the operating temperature down to 120 °C. The 15 wt% Nb2C MXene-precursor-mixed MoO3 sensor exhibits an enhanced response of 6.1 toward 100 ppm ethanol, which is higher than that of pristine MoO3 nanotubes at 120 °C, with response and recovery times of 19 s and 72 s, respectively. The sensors show high selectivity toward ethanol over other VOC gases and good long-term stability over 30 days. This work confirms that crystal engineering is an effective method for reducing operating temperature and enhancing gas-sensing performance, and the sensor shows potential application for ethanol sensing. Full article
(This article belongs to the Special Issue Gas Sensors: Materials, Mechanisms and Applications: 2nd Edition)
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17 pages, 4194 KB  
Article
Adsorptive Gas Sensor Response Forecasting to Enable Breath-by-Breath Analysis
by Samuel Bellaire, Samir Rawashdeh, Kirby P. Mayer and Jamie L. Sturgill
Sensors 2026, 26(7), 2234; https://doi.org/10.3390/s26072234 - 4 Apr 2026
Viewed by 557
Abstract
MOS gas sensors have proven to be useful in electronic noses, which utilize these sensors to detect volatile organic compounds in human breath to detect various lung diseases. Unfortunately, the long settling time of MOS gas sensors is ill-suited to measuring human breath, [...] Read more.
MOS gas sensors have proven to be useful in electronic noses, which utilize these sensors to detect volatile organic compounds in human breath to detect various lung diseases. Unfortunately, the long settling time of MOS gas sensors is ill-suited to measuring human breath, where complete breathing cycles are often shorter than 5 s. Existing studies circumvent this limitation by collecting gas samples and injecting them into a sealed chamber to react with the sensors. However, it would be convenient if breath-by-breath analysis could be conducted without the need to store breath samples. To accomplish this, we present a novel forecasting methodology to predict the final value t∞ of a gas sensor’s response based on its initial transient behavior. To do this, we present and validate a second-order mathematical model of the sensors’ response characteristics, which we then use in our preliminary work using neural networks to predict the final sensor value. Although some challenges were encountered, the initial results are encouraging, and we plan to extend our study in the future to collect a more expansive dataset and explore the use of other types of machine learning algorithms for this application. Full article
(This article belongs to the Special Issue Gas Sensors: Materials, Mechanisms and Applications: 2nd Edition)
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16 pages, 2613 KB  
Article
Electrospun Amorphous Indium Gallium Zinc Oxide (IGZO) Nanofibers for Highly Selective H2S Gas Sensing
by Anh-Duy Nguyen, Sung Tae Lim, Jong Heon Kim, Yujin Kim, Gayoung Yoon, Ali Mirzaei, Hyoun Woo Kim and Sang Sub Kim
Sensors 2026, 26(6), 1936; https://doi.org/10.3390/s26061936 - 19 Mar 2026
Viewed by 573
Abstract
As a ternary metal oxide, indium gallium zinc oxide (IGZO) has gathered much attention for various applications, including gas sensors, due to its remarkable semiconducting properties, even in amorphous phases and at a low process temperature. For gas sensing applications, as surface area [...] Read more.
As a ternary metal oxide, indium gallium zinc oxide (IGZO) has gathered much attention for various applications, including gas sensors, due to its remarkable semiconducting properties, even in amorphous phases and at a low process temperature. For gas sensing applications, as surface area is an important factor affecting the response and performance of a gas sensor, nanofibers (NFs) with 1D morphology are expected to have good sensing performance. In this research, IGZO NFs were synthesized using an electrospinning process, which is a suitable technique for the large-scale and low-cost fabrication of NFs. Various characterizations were performed on the synthesized IGZO NFs, and the desired NF morphology and chemical composition were confirmed. Gas sensing experiments showed that the sensor was sensitive and selective to H2S gas at 250 °C with a response of 40.5 to 100 ppm gas. This study demonstrates the strong potential of IGZO for use in sensitive and selective H2S gas sensors. Full article
(This article belongs to the Special Issue Gas Sensors: Materials, Mechanisms and Applications: 2nd Edition)
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12 pages, 8634 KB  
Article
Industrial Potential of Formaldehyde Gas Sensor Based on PdPt Bimetallic Loaded SnO2 Nanoparticles
by Bing Shen, Tongwei Yuan, Wenshuang Zhang, Xian Tan, Yang Chen and Jiaqiang Xu
Sensors 2025, 25(5), 1627; https://doi.org/10.3390/s25051627 - 6 Mar 2025
Cited by 6 | Viewed by 3728
Abstract
SnO2-based semiconductor gas-sensing materials are regarded as some of the most crucial sensing materials, owing to their extremely high electron mobility, high sensitivity, and excellent stability. To bridge the gap between laboratory-scale SnO2 and its industrial applications, low-cost and high-efficiency [...] Read more.
SnO2-based semiconductor gas-sensing materials are regarded as some of the most crucial sensing materials, owing to their extremely high electron mobility, high sensitivity, and excellent stability. To bridge the gap between laboratory-scale SnO2 and its industrial applications, low-cost and high-efficiency requirements must be met. This implies the need for simple synthesis techniques, reduced energy consumption, and satisfactory gas-sensing performances. In this study, we utilized a surfactant-free simple method to modify SnO2 nanoparticles with PdPt noble metals, ensuring the stable state of the material. Under the synergistic catalytic effect of Pd and Pt, the composite material (1.0 wt%-PdPt-SnO2) significantly enhanced its response to HCHO. This modification decreased the optimal working temperature to as low as 180 °C to achieve a response value (Ra/Rg = 8.2) and showcased lower operating temperatures, higher sensitivity, and better selectivity to detect 10 ppm of HCHO when compared with pristine SnO2 or single noble metal-decorated SnO2 sensors. Stability tests verified that the gas sensor signals based on PdPt-SnO2 nanoparticles exhibit good reliability. Furthermore, a portable HCHO detector was designed for practical applications, such as in newly purchased cushions, indicating its potential for industrialization beyond the laboratory. Full article
(This article belongs to the Special Issue Gas Sensors: Materials, Mechanisms and Applications: 2nd Edition)
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