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Applied Sciences
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Metal Oxide Gas Sensors
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Metal Oxide Gas Sensors

A special issue of Applied Sciences (ISSN 2076-3417). This special issue belongs to the section "Materials Science and Engineering".

Deadline for manuscript submissions: closed (30 April 2019) | Viewed by 3355

Special Issue Editor

Prof. Dr. Wooyoung Lee

E-Mail Website
Guest Editor
Department of Materials Science and Engineering, Yonsei University, Seoul 03722, Korea
Interests: nanomaterials; semiconducting metal oxide gas sensors; hydrogen sensors; breath analyzer; spintronic devices; thermoelectric devices

Special Issue Information

Dear Colleagues,

The field of gas sensors faces continuous evolution and further improvements are awaited, both in fundamental studies and in applications. High sensitivity and selectivity of metal oxide-based sensors, compliance with harsh environments, reproducibility for commercial applications, and the applicability of sensor arrays remain problems in the academic area. To be able to meet the needs of all, or part, of those applications, we need to improve the performance of sensors and that requires advances in both science and technology. Accordingly, you are invited to submit contributions in understanding the sensing phenomena and advances in investigation techniques; developing novel materials and sensing strategies; developing novel sensing platforms and solving applications using metal oxide-based sensors.

This Special Issue, “Metal Oxide Gas Sensors”, is intended for a wide and interdisciplinary audience, and covers recent advances in:

- innovative concepts to increase gas sensing performance

- development of synthetic methods of new gas-sensing materials

- enhanced selectivity in metal-oxide based gas sensors

- alternative gas-sensing techniques

- improved characterization methods and theoretical modeling

- optimization of sensor modules with reducing costs

- nanomaterials and nanostructures

Prof. Wooyoung Lee
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 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. Applied Sciences 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 2400 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

  • Metal oxide-based gas sensors
  • Modeling of sensing
  • Surface sensitizers and catalytic additives
  • Sensor arrays
  • Gas sensors applications
  • Experimental investigations—operando

Published Papers (1 paper)

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Research

11 pages, 3557 KiB  
Article
HMT-Controlled Synthesis of Mesoporous NiO Hierarchical Nanostructures and Their Catalytic Role towards the Thermal Decomposition of Ammonium Perchlorate
by Songzhong Ye and Xiangfeng Guan
Appl. Sci. 2019, 9(13), 2599; https://doi.org/10.3390/app9132599 - 27 Jun 2019
Cited by 21 | Viewed by 3132
Abstract
In this work, mesoporous nickel oxide (NiO) hierarchical nanostructures were synthesized by a facile approach by hydrothermal reaction and subsequent calcination. The phase structure, microstructure, element composition, surface area, and pore size distribution of the as-prepared products were characterized by X-ray diffraction (XRD), [...] Read more.
In this work, mesoporous nickel oxide (NiO) hierarchical nanostructures were synthesized by a facile approach by hydrothermal reaction and subsequent calcination. The phase structure, microstructure, element composition, surface area, and pore size distribution of the as-prepared products were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), X-ray photoelectron spectroscopy (XPS), and the Brunauer–Emmett–Teller (BET) technique. The precursor of Ni3(NO3)2(OH)4 nanosheet, Ni3(NO3)2(OH)4 microsphere, and Ni(HCO3)2 sub-microsphere was obtained by hydrothermal reaction at 160 °C for 4 h when the ratio of Ni2+/HMT (hexamethylenetetramine) was 2:1, 1:2, and 1:3, respectively. After calcination at 400 °C for 2 h, the precursors were completely transformed to mesoporous NiO hierarchical nanosheet, microsphere, and sub-microsphere. When evaluated as additives of the thermal decomposition of ammonium perchlorate (AP), these NiO nanostructures significantly reduce the decomposition temperature of AP, showing obvious catalytic activity. In particular, NiO sub-microsphere have the best catalytic role, which can reduce the high temperature decomposition (HTD) and low temperature decomposition (LTD) temperature by 75.2 and 19.1 °C, respectively. The synthetic approach can easily control the morphology and pore structure of the NiO nanostructures by adjusting the ratio of Ni2+/HMT in the reactants and subsequent calcination, which avoids using expensive templates or surfactant and could be intended to prepare other transition metal oxide. Full article
(This article belongs to the Special Issue Metal Oxide Gas Sensors)
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