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Characterization of metal oxide gas sensors via optical techniques
Metal oxide (MOX) sensors are increasingly gaining attention in analytical applications. Their fundamental operation principle is based on conversion reactions of selected molecular species at their semiconducting surface. However, the exact turnover of analyte gas in relation to the concentration h...
Autores principales: | , , , , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
Springer Berlin Heidelberg
2020
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Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7329784/ https://www.ncbi.nlm.nih.gov/pubmed/32548766 http://dx.doi.org/10.1007/s00216-020-02705-6 |
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author | Glöckler, Johannes Jaeschke, Carsten Tütüncü, Erhan Kokoric, Vjekoslav Kocaöz, Yusuf Mizaikoff, Boris |
author_facet | Glöckler, Johannes Jaeschke, Carsten Tütüncü, Erhan Kokoric, Vjekoslav Kocaöz, Yusuf Mizaikoff, Boris |
author_sort | Glöckler, Johannes |
collection | PubMed |
description | Metal oxide (MOX) sensors are increasingly gaining attention in analytical applications. Their fundamental operation principle is based on conversion reactions of selected molecular species at their semiconducting surface. However, the exact turnover of analyte gas in relation to the concentration has not been investigated in detail to date. In the present study, two optical sensing techniques—luminescence quenching for molecular oxygen and infrared spectroscopy for carbon dioxide and methane—have been coupled for characterizing the behavior of an example semiconducting MOX methane gas sensor integrated into a recently developed low-volume gas cell. Thereby, oxygen consumption during MOX operation as well as the generation of carbon dioxide from the methane conversion reaction could be quantitatively monitored. The latter was analyzed via a direct mid-infrared gas sensor system based on substrate-integrated hollow waveguide (iHWG) technology combined with a portable Fourier transform infrared spectrometer, which has been able to not only detect the amount of generated carbon dioxide but also the consumption of methane during MOX operation. Hence, a method based entirely on direct optical detection schemes was developed for characterizing the actual signal generating processes—here for the detection of methane—via MOX sensing devices via near real-time online analysis. [Figure: see text] |
format | Online Article Text |
id | pubmed-7329784 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2020 |
publisher | Springer Berlin Heidelberg |
record_format | MEDLINE/PubMed |
spelling | pubmed-73297842020-07-07 Characterization of metal oxide gas sensors via optical techniques Glöckler, Johannes Jaeschke, Carsten Tütüncü, Erhan Kokoric, Vjekoslav Kocaöz, Yusuf Mizaikoff, Boris Anal Bioanal Chem Research Paper Metal oxide (MOX) sensors are increasingly gaining attention in analytical applications. Their fundamental operation principle is based on conversion reactions of selected molecular species at their semiconducting surface. However, the exact turnover of analyte gas in relation to the concentration has not been investigated in detail to date. In the present study, two optical sensing techniques—luminescence quenching for molecular oxygen and infrared spectroscopy for carbon dioxide and methane—have been coupled for characterizing the behavior of an example semiconducting MOX methane gas sensor integrated into a recently developed low-volume gas cell. Thereby, oxygen consumption during MOX operation as well as the generation of carbon dioxide from the methane conversion reaction could be quantitatively monitored. The latter was analyzed via a direct mid-infrared gas sensor system based on substrate-integrated hollow waveguide (iHWG) technology combined with a portable Fourier transform infrared spectrometer, which has been able to not only detect the amount of generated carbon dioxide but also the consumption of methane during MOX operation. Hence, a method based entirely on direct optical detection schemes was developed for characterizing the actual signal generating processes—here for the detection of methane—via MOX sensing devices via near real-time online analysis. [Figure: see text] Springer Berlin Heidelberg 2020-06-16 2020 /pmc/articles/PMC7329784/ /pubmed/32548766 http://dx.doi.org/10.1007/s00216-020-02705-6 Text en © The Author(s) 2020 Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if changes were made. The images or other third party material in this article are included in the article's Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article's Creative Commons licence and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this licence, visit http://creativecommons.org/licenses/by/4.0/. |
spellingShingle | Research Paper Glöckler, Johannes Jaeschke, Carsten Tütüncü, Erhan Kokoric, Vjekoslav Kocaöz, Yusuf Mizaikoff, Boris Characterization of metal oxide gas sensors via optical techniques |
title | Characterization of metal oxide gas sensors via optical techniques |
title_full | Characterization of metal oxide gas sensors via optical techniques |
title_fullStr | Characterization of metal oxide gas sensors via optical techniques |
title_full_unstemmed | Characterization of metal oxide gas sensors via optical techniques |
title_short | Characterization of metal oxide gas sensors via optical techniques |
title_sort | characterization of metal oxide gas sensors via optical techniques |
topic | Research Paper |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7329784/ https://www.ncbi.nlm.nih.gov/pubmed/32548766 http://dx.doi.org/10.1007/s00216-020-02705-6 |
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