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Advanced Materials for Gas Sensors (Volume II)
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Advanced Materials for Gas Sensors (Volume II)

A special issue of Materials (ISSN 1996-1944). This special issue belongs to the section "Advanced Nanomaterials and Nanotechnology".

Deadline for manuscript submissions: closed (20 August 2023) | Viewed by 8176

Special Issue Editor

Dr. Cristian E. Simion

E-Mail Website
Guest Editor
National Institute of Materials Physics, Atomistilor 405A, 077125 Magurele, Romania
Interests: semiconducting metal oxide-based gas sensors; gas–surface interactions; realistic modeling of the gas sensing mechanism; fundamental understanding of the functioning principles with chemoresistive gas sensors
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

Nowadays, for various types of advanced materials, the physico–chemcal properties are not solely determined by their crystalline structure, but also by their size and shape.

It has been demonstrated that metal oxide-based nanomaterials exhibit new phenomena because of their comparative distances between the size and fundamental interaction path. In this respect, the associated gas sensing properties are significantly affected. Although there is a pool of publications related to the gas sensing applications of new advanced materials, a fundamental understanding of the way in which the morphology changes are mirrored in the sensing performances (sensitivity, selectivity, response/recovery transients, and stability) are still limited now.

Seen in perspective, a step forward highlighting the functionality features can be done by involving adapted investigation techniques in such a way as to provide realistic outcomes. Thus, the “trial-and-error-approach” can be left apart.

Accordingly, you are invited to submit contributions that are related to the following topics:

  • different tuning procedures of the gas sensing performance with advanced materials;
  • gaining insights into the way in which structural and morphological aspects of different materials have influence over their sensing behavior;
  • tailoring preparation strategies towards overcoming gas sensing drawbacks, such as a low selectivity and relative humidity influence;
  • newly merged materials and their associated sensing features.

Manuscripts from industry are also well welcomed.

Dr. Cristian E. Simion
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. Materials 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

  • semiconducting metal oxide (SMOX)-based gas sensors
  • sensing and transduction principles with SMOX materials
  • environmental sensors for monitoring and control
  • 1D, 2D, and 3D nanostructured materials for gas sensing applications
  • correlation of the structural and morphological properties with the gas sensing performances
  • advanced materials and their gas sensing principles
  • new tailored materials for infield gas sensing applications

Related Special Issue

Published Papers (4 papers)

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Research

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14 pages, 9506 KiB  
Article
Photocatalytic Evaluation and Application as a Sensor for the Toxic Atmospheres (Propane and Carbon Monoxide) of Nickel Antimonate (NiSb2O6) Powders
by Jacob Morales-Bautista, Héctor Guillén-Bonilla, Alex Guillén-Bonilla, Verónica-María Rodríguez-Betancourtt, Jorge Alberto Ramírez-Ortega and José Trinidad Guillén-Bonilla
Materials 2023, 16(14), 5024; https://0-doi-org.brum.beds.ac.uk/10.3390/ma16145024 - 16 Jul 2023
Viewed by 1229
Abstract
Nickel antimonate (NiSb2O6) powders were synthesized using a wet chemistry process assisted by microwave radiation and calcination from 600 to 700 °C to evaluate their photocatalytic and gas-sensing properties. The crystalline phase obtained at 800 °C of trirutile-type nickel [...] Read more.
Nickel antimonate (NiSb2O6) powders were synthesized using a wet chemistry process assisted by microwave radiation and calcination from 600 to 700 °C to evaluate their photocatalytic and gas-sensing properties. The crystalline phase obtained at 800 °C of trirutile-type nickel antimonate was confirmed with powder X-ray diffraction. The morphology and size of the nanostructures were analyzed employing electron microscopy (SEM and TEM), identifying irregular particles and microrods (~277 nm, made up of polyhedral shapes of size ~65 nm), nanorods with an average length of ~77 nm, and nanostructures of polyhedral type of different sizes. UV-vis analysis determined that the bandgap of the powders obtained at 800 °C was ~3.2 eV. The gas sensing tests obtained a maximum response of ~5 for CO (300 ppm) at 300 °C and ~10 for C3H8 (500 ppm) at 300 °C. According to these results, we consider that NiSb2O6 can be applied as a gas sensor. On the other hand, the photocatalytic properties of the antimonate were examined by monitoring the discoloration of malachite green (MG) at five ppm. MG concentration monitoring was carried out using UV-visible spectroscopy, and 85% discoloration was achieved after 200 min of photocatalytic reaction. Full article
(This article belongs to the Special Issue Advanced Materials for Gas Sensors (Volume II))
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11 pages, 4400 KiB  
Article
Preparation of MoS2 Nanospheres using a Hydrothermal Method and Their Application as Ammonia Gas Sensors Based on Delay Line Surface Acoustic Wave Devices
by Chan-Yu Chung, Ying-Chung Chen, Feng-Renn Juang, Kuo-Sheng Kao and En-I Lee
Materials 2023, 16(13), 4703; https://0-doi-org.brum.beds.ac.uk/10.3390/ma16134703 - 29 Jun 2023
Cited by 1 | Viewed by 1338
Abstract
An ammonia sensor based on a delay-line surface acoustic wave (SAW) device is developed in this study by coating the delay line area of the device with a nano-structured molybdenum disulfide (MoS2) sensitive material. A SAW device of 122 MHz was [...] Read more.
An ammonia sensor based on a delay-line surface acoustic wave (SAW) device is developed in this study by coating the delay line area of the device with a nano-structured molybdenum disulfide (MoS2) sensitive material. A SAW device of 122 MHz was designed and fabricated with a pair of interdigital transducers (IDTs) defined on a 128° y-cut LiNbO3 substrate using photolithography technologies, and the aluminum IDT electrodes were deposited by a DC magnetron sputtering system. By adjusting the pH values of precursor solutions, molybdenum disulfide (MoS2) nanospheres were prepared with various structures using a hydrothermal method. Finally, an NH3 gas sensor with high sensitivity of 4878 Hz/ppm, operating at room temperature, was successfully obtained. The excellent sensitivity performance may be due to the efficient adsorption of NH3 gas molecules on the surfaces of the nanoflower-like MoS2, which has a larger specific surface area and provides more active sites, and results in a larger change in the resonant frequency of the device due to the mass loading effect. Full article
(This article belongs to the Special Issue Advanced Materials for Gas Sensors (Volume II))
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14 pages, 2756 KiB  
Article
Study on the Dynamic Characteristics of a SiC-Based Capacitive Micro-Accelerometer in Rarefied Air
by Xiang Tian and Wei Sheng
Materials 2022, 15(13), 4692; https://0-doi-org.brum.beds.ac.uk/10.3390/ma15134692 - 04 Jul 2022
Cited by 1 | Viewed by 1162
Abstract
In this study, we investigated the viscosity, squeeze-film damping, and a SiC-based capacitive micro-accelerometer in rarefied air. A specific expression for the effective viscosity coefficient of the air was derived, and when the air pressure drops from the standard atmospheric pressure, the viscosity [...] Read more.
In this study, we investigated the viscosity, squeeze-film damping, and a SiC-based capacitive micro-accelerometer in rarefied air. A specific expression for the effective viscosity coefficient of the air was derived, and when the air pressure drops from the standard atmospheric pressure, the viscosity of the air will decrease accordingly. Decreases in the air pressure and the viscosity of the air lead to the change in the squeeze-film air damping in the micro-accelerometer, and both the viscous damping force and the elastic damping force of the air film between the moving electrode plate and the fixed electrode plate will also decrease. The damping coefficient and relative damping ratio of the micro-accelerometer in rarefied air were calculated, which was also confirmed by simulations. The changes of the damping coefficient and the relative damping ratio of the system will directly affect the dynamic characteristics of the micro-accelerometer. When the air pressure in the working environment is below the standard atmospheric pressure, the micro-accelerometer will be in an underdamping state. With the decrease in the air pressure, the working bandwidth of the micro-accelerometer will decrease significantly, and the resonant phenomenon may appear. However, the decrease in the air pressure will not have a notable impact on the response time of the micro-accelerometer. Therefore, this work provides a theoretical basis for the study of the performance characteristics of a SiC-based capacitive accelerometer in rarefied air. Full article
(This article belongs to the Special Issue Advanced Materials for Gas Sensors (Volume II))
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Review

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27 pages, 5047 KiB  
Review
Recent Advances in Ethylene Gas Detection
by Xiaohu Chen, Ryan Wreyford and Noushin Nasiri
Materials 2022, 15(17), 5813; https://0-doi-org.brum.beds.ac.uk/10.3390/ma15175813 - 23 Aug 2022
Cited by 10 | Viewed by 3797
Abstract
The real-time detecting and monitoring of ethylene gas molecules could benefit the agricultural, horticultural and healthcare industries. In this regard, we comprehensively review the current state-of-the-art ethylene gas sensors and detecting technologies, covering from preconcentrator-equipped gas chromatographic systems, Fourier transform infrared technology, photonic [...] Read more.
The real-time detecting and monitoring of ethylene gas molecules could benefit the agricultural, horticultural and healthcare industries. In this regard, we comprehensively review the current state-of-the-art ethylene gas sensors and detecting technologies, covering from preconcentrator-equipped gas chromatographic systems, Fourier transform infrared technology, photonic crystal fiber-enhanced Raman spectroscopy, surface acoustic wave and photoacoustic sensors, printable optically colorimetric sensor arrays to a wide range of nanostructured chemiresistive gas sensors (including the potentiometric and amperometric-type FET-, CNT- and metal oxide-based sensors). The nanofabrication approaches, working conditions and sensing performance of these sensors/technologies are carefully discussed, and a possible roadmap for the development of ethylene detection in the near future is proposed. Full article
(This article belongs to the Special Issue Advanced Materials for Gas Sensors (Volume II))
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