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Micromachines
Special Issues
Recent Advances in Chemical Gas Sensors
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Recent Advances in Chemical Gas Sensors

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

Deadline for manuscript submissions: closed (28 February 2023) | Viewed by 6250

Special Issue Editor

Dr. Aman Bhardwaj

E-Mail Website
Guest Editor
Institute of Inorganic Chemistry, University of Cologne, 50939 Cologne, Germany
Interests: nanomaterials; thin films; electrochemistry; electrocatalysis; energy conversion, storage and harvest; environmental applications; functional ceramics

Special Issue Information

Dear Colleagues,

Currently, gas sensors have become an integral necessity of numerous technological devices in a variety of applications. According the application need, variable sensing characteristics are often desired that are usually defined in terms of sensitivity, selectivity, gas concentration range, operating temperature range, and thermochemical stability. Among various sensing techniques, chemical gas sensors are a potentially competitive sensing technology that have reached the commercial market. In recent years, there has been enormous progress in the development of high-performance and miniaturized sensors, including chemoresistive, electrochemical and field-effect transistor (FET)-type gas sensors. These advancements will further widen the horizon of the sensor market in industrial, agricultural and automotive environment monitoring.

This Special Issue will provide a platform to feature recent efforts aimed toward advancing fundamental and applied research in the area of chemical gas sensors. Original research papers, short communications and review articles are expected to cover but not limit to the following domains:

  • Novel nano- and heterostructure materials;
  • Thin films, porous materials;
  • Metal oxide/semiconductor heterojunctions;
  • New sensing principles and mechanisms;
  • Automotive gas sensors;
  • Miniaturized and integrated sensors;
  • Functional sensor materials;
  • Chemoresistive gas sensors;
  • Electrochemical gas sensors;
  • Capacitive gas sensors;
  • FET/MEMS gas sensors.

Dr. Aman Bhardwaj
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. 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 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
  • electrochemical
  • mixed potential
  • chemoresistive
  • solid electrolyte
  • FET
  • MOSFET
  • capacitive
  • MEMS
  • heterostructure
  • heterojunction
  • functional
  • semiconductor
  • thin films
  • porous materials

Published Papers (3 papers)

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Research

14 pages, 4114 KiB  
Article
Sub PPM Detection of NO2 Using Strontium Doped Bismuth Ferrite Nanostructures
by David John Dmonte, Aman Bhardwaj, Michael Wilhelm, Thomas Fischer, Ivo Kuřitka and Sanjay Mathur
Micromachines 2023, 14(3), 644; https://doi.org/10.3390/mi14030644 - 12 Mar 2023
Cited by 4 | Viewed by 1633
Abstract
The present work investigates the NO2 sensing properties of acceptor-doped ferrite perovskite nanostructures. The Sr-doped BiFeO3 nanostructures were synthesized by a salt precursor-based modified pechini method and characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), and X-ray photoelectron spectroscopy (XPS). [...] Read more.
The present work investigates the NO2 sensing properties of acceptor-doped ferrite perovskite nanostructures. The Sr-doped BiFeO3 nanostructures were synthesized by a salt precursor-based modified pechini method and characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), and X-ray photoelectron spectroscopy (XPS). The synthesized materials were drop coated to fabricate chemoresistive gas sensors, delivering a maximum sensitivity of 5.2 towards 2 ppm NO2 at 260 °C. The recorded values of response and recovery time are 95 s and 280 s, respectively. The sensor based on Bi0.8Sr0.2FeO3–δ (BSFO) that was operated was shown to have a LOD (limit of detection) as low as 200 ppb. The sensor proved to be promising for repeatability and selectivity measurements, indicating that the Sr doping Bismuth ferrite could be a potentially competitive material for sensing applications. A relevant gas-sensing mechanism is also proposed based on the surface adsorption and reaction behavior of the material. Full article
(This article belongs to the Special Issue Recent Advances in Chemical Gas Sensors)
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10 pages, 1913 KiB  
Article
Monitoring Xenon Capture in a Metal Organic Framework Using Laser-Induced Breakdown Spectroscopy
by Hunter B. Andrews, Praveen K. Thallapally and Alexander J. Robinson
Micromachines 2023, 14(1), 82; https://doi.org/10.3390/mi14010082 - 29 Dec 2022
Cited by 5 | Viewed by 1758
Abstract
Molten salt reactor operation will necessitate circulation of a cover gas to remove certain evolved fission products and maintain an inert atmosphere. The cover gas leaving the reactor core is expected to contain both noble and non-noble gases, aerosols, volatile species, tritium, and [...] Read more.
Molten salt reactor operation will necessitate circulation of a cover gas to remove certain evolved fission products and maintain an inert atmosphere. The cover gas leaving the reactor core is expected to contain both noble and non-noble gases, aerosols, volatile species, tritium, and radionuclides and their daughters. To remove these radioactive gases, it is necessary to develop a robust off-gas system, along with novel sensors to monitor the gas stream and the treatment system performance. In this study, a metal organic framework (MOF) was engineered for the capture of Xe, a major contributor to the off-gas source term. The engineered MOF column was tested with a laser-induced breakdown spectroscopy (LIBS) sensor for noble gas monitoring. The LIBS sensor was used to monitor breakthrough tests with various Xe, Kr, and Ar mixtures to determine the Xe selectivity of the MOF column. This study offers an initial demonstration of the feasibility of monitoring off-gas treatment systems using a LIBS sensor to aid in the development of new capture systems for molten salt reactors. Full article
(This article belongs to the Special Issue Recent Advances in Chemical Gas Sensors)
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19 pages, 4979 KiB  
Article
Gas Selectivity Enhancement Using Serpentine Microchannel Shaped with Optimum Dimensions in Microfluidic-Based Gas Sensor
by Maryam Aghaseyedi, Alireza Salehi, Shayan Valijam and Mostafa Shooshtari
Micromachines 2022, 13(9), 1504; https://doi.org/10.3390/mi13091504 - 10 Sep 2022
Cited by 7 | Viewed by 2159
Abstract
A microfluidic-based gas sensor was chosen as an alternative method to gas chromatography and mass spectroscopy systems because of its small size, high accuracy, low cost, etc. Generally, there are some parameters, such as microchannel geometry, that affect the gas response and selectivity [...] Read more.
A microfluidic-based gas sensor was chosen as an alternative method to gas chromatography and mass spectroscopy systems because of its small size, high accuracy, low cost, etc. Generally, there are some parameters, such as microchannel geometry, that affect the gas response and selectivity of the microfluidic-based gas sensors. In this study, we simulated and compared 3D numerical models in both simple and serpentine forms using COMSOL Multiphysics 5.6 to investigate the effects of microchannel geometry on the performance of microfluidic-based gas sensors using multiphysics modeling of diffusion, surface adsorption/desorption and surface reactions. These investigations showed the simple channel has about 50% more response but less selectivity than the serpentine channel. In addition, we showed that increasing the length of the channel and decreasing its height improves the selectivity of the microfluidic-based gas sensor. According to the simulated models, a serpentine microchannel with the dimensions W = 3 mm, H = 80 µm and L = 22.5 mm is the optimal geometry with high selectivity and gas response. Further, for fabrication feasibility, a polydimethylsiloxane serpentine microfluidic channel was fabricated by a 3D printing mold and tested according to the simulation results. Full article
(This article belongs to the Special Issue Recent Advances in Chemical Gas Sensors)
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