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Inorganics
Special Issues
Gas Sensors Based on Inorganic Materials
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Gas Sensors Based on Inorganic Materials

A special issue of Inorganics (ISSN 2304-6740).

Deadline for manuscript submissions: closed (25 August 2023) | Viewed by 3455

Special Issue Editors

Dr. Wenjun Yan

E-Mail Website
Guest Editor
Department of Chemical and Biological Engineering, Zhejiang University, Hangzhou 310027, China
Interests: semiconductor gas sensor; integrated system
Dr. Yuxiang Qin

E-Mail Website
Guest Editor
School of Microelectronics, Tianjin University, Tianjin 300072, China
Interests: silicon-based gas sensor; low-temperature gas sensor; sensing material
Special Issues, Collections and Topics in MDPI journals
Dr. Wenpeng Liu

E-Mail Website
Guest Editor
Department of Medicine, Brigham and Women's Hospital, Harvard Medical School, Boston, MA 02115, USA
Interests: nanophotonics; nanomaterials; acoustofluidics; biosensing; biochemistry

Special Issue Information

Dear Colleagues,

Gas sensors play an important role in various fields, such as environmental monitoring, personal safety, medical diagnosis, and industrial control. Semiconductor gas sensors based on inorganic materials, such as metal oxides, carbon nanotubes, graphene, metal sulfides and MXene, have been widely studied and applied. Nevertheless, the high operating temperatures, poor selectivity, compliance to harsh environments, reproducibility for real applications, and intelligentization remain issues for semiconductor gas sensors. Inorganics created this Special Issue to collect the latest research works in the field of inorganic material-based gas sensors concerning the improvement of humidity tolerances, stability, low operating temperatures, quick response/recovery processes, low detection limits and intelligentization. All analytical works on gas sensing mechanisms are also welcome. Both original research papers and review articles will be considered for publication.

The areas of particular interest in this Special Issue include, but are not limited to:

  • Inorganic materials for gas sensors;
  • Nanocomposites based on inorganic materials for gas sensors;
  • Semiconductor gas sensors;
  • Intelligent gas sensors.

Dr. Wenjun Yan
Dr. Yuxiang Qin
Dr. Wenpeng Liu
Guest Editors

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. Inorganics 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

  • inorganic materials
  • gas sensors
  • gas sensing mechanism
  • electronic nose
  • intelligent gas sensor

Published Papers (2 papers)

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Research

12 pages, 4518 KiB  
Article
Room-Temperature Hydrogen-Sensitive Pt-SnO2 Composite Nanoceramics: Contrasting Roles of Pt Nano-Catalysts Loaded via Two Different Methods
by Jieting Zhao, Jiannan Song, Xilai Lu, Menghan Wu, Zhiqiao Yan, Feng Chen and Wanping Chen
Inorganics 2023, 11(9), 366; https://doi.org/10.3390/inorganics11090366 - 9 Sep 2023
Cited by 2 | Viewed by 1063
Abstract
Soluble noble metal salts are widely used for loading noble metals as nano-catalysts in many applications. In this paper, Pt-SnO2 composite nanoceramics were prepared from SnO2 nanoparticles and H2PtCl6 using two Pt loading methods separately: for the solution [...] Read more.
Soluble noble metal salts are widely used for loading noble metals as nano-catalysts in many applications. In this paper, Pt-SnO2 composite nanoceramics were prepared from SnO2 nanoparticles and H2PtCl6 using two Pt loading methods separately: for the solution reduction method, a H2PtCl6 solution was added to a suspension of SnO2 and zinc powder to form Pt on SnO2 nanoparticles, and for the impregnation method, Pt was formed from H2PtCl6 in the course of sintering. Although a series of samples prepared using both Pt loading methods showed a solid response to H2 at room temperature, the ones prepared using the solution reduction method exhibited much better room-temperature hydrogen-sensing characteristics. For two samples of 0.5 wt% Pt and sintered at 825 °C, the response value for the sample prepared using the solution reduction method was 9700 to 1% H2–20% O2-N2, which was much larger than the value of 145 for the sample prepared using the impregnation method. Samples prepared using the two Pt loading methods have similar microstructures characterized via XRD, FESEM, EDS, TEM, and HRTEM. However, the residual chlorine content in those using the impregnation method was higher than those using the solution reduction method according to the analysis. It is proposed that the striking difference in room-temperature hydrogen sensing characteristics among samples prepared using these two different Pt loading methods separately resulted from their different chlorine removal processes. This study demonstrates the importance of a proper method for loading noble metals from their soluble salts as nano-catalysts in many applications. Full article
(This article belongs to the Special Issue Gas Sensors Based on Inorganic Materials)
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7 pages, 1318 KiB  
Communication
NH3 Sensor Based on ZIF-8/CNT Operating at Room Temperature with Immunity to Humidity
by Wenjun Yan, Shiyu Zhou, Min Ling, XinSheng Peng and Houpan Zhou
Inorganics 2022, 10(11), 193; https://doi.org/10.3390/inorganics10110193 - 31 Oct 2022
Cited by 2 | Viewed by 1659
Abstract
Humidity effects on resistive gas sensors operating at room temperature remain a serious bottleneck. In this work, we introduce a resistive gas sensor based on a zeolitic imidazolate framework-8/carbon nanotube (ZIF-8/CNT) composite for the detection of ammonia gas at room temperature. The composite [...] Read more.
Humidity effects on resistive gas sensors operating at room temperature remain a serious bottleneck. In this work, we introduce a resistive gas sensor based on a zeolitic imidazolate framework-8/carbon nanotube (ZIF-8/CNT) composite for the detection of ammonia gas at room temperature. The composite was prepared using a facile solution method. In this sensor, the basic mechanism was the charge transfer between ammonia molecules and CNTs; meanwhile, the ZIF-8 facilitated the adsorption of ammonia molecules as a preconcentrator, and prevented the adsorption of H2O molecules due to its hydrophobicity; CNTs were threaded through the ZIF-8 to form a great conductive network for charge transfer. The obtained sensor showed good ammonia sensing, especially at room temperature, with great selectivity and immunity to humidity under moderately humid conditions (45–70 % RH). However, the ammonia response was reduced at very high humidity (90% RH) due to the competitive adsorption of H2O molecules. This proved that the NH3 sensor based on ZIF-8/CNT could be suitable for practical applications under moderately humid conditions. Full article
(This article belongs to the Special Issue Gas Sensors Based on Inorganic Materials)
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