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Gas Detection Using Portable Deep-UV Absorption Spectrophotometry: A Review
Several gas molecules of environmental and domestic significance exhibit a strong deep-UV absorption. Therefore, a sensitive and a selective gas detector based on this unique molecular property (i.e., absorption at a specific wavelength) can be developed using deep-UV absorption spectrophotometry. U...
Autores principales: | , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
MDPI
2019
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Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6929016/ https://www.ncbi.nlm.nih.gov/pubmed/31795069 http://dx.doi.org/10.3390/s19235210 |
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author | Khan, Sulaiman Newport, David Le Calvé, Stéphane |
author_facet | Khan, Sulaiman Newport, David Le Calvé, Stéphane |
author_sort | Khan, Sulaiman |
collection | PubMed |
description | Several gas molecules of environmental and domestic significance exhibit a strong deep-UV absorption. Therefore, a sensitive and a selective gas detector based on this unique molecular property (i.e., absorption at a specific wavelength) can be developed using deep-UV absorption spectrophotometry. UV absorption spectrometry provides a highly sensitive, reliable, self-referenced, and selective approach for gas sensing. This review article addresses the recent progress in the application of deep-UV absorption for gas sensing owing to its inherent features and tremendous potentials. Applications, advancements, and challenges related to UV emission sources, gas cells, and UV photodetectors are assessed and compared. We present the relevant theoretical aspects and challenges associated with the development of portable sensitive spectrophotometer. Finally, the applications of UV absorption spectrometry for ozone, NO(2), SO(2), and aromatic organic compounds during the last decades are discussed and compared. A portable UV absorption spectrophotometer can be developed by using LEDs, hollow core waveguides (HCW), and UV photodetectors (i.e., photodiodes). LED provides a portable UV emission source with low power input, low-intensity drifts, low cost, and ease of alignment. It is a quasi-chromatic UV source and covers the absorption band of molecules without optical filters for absorbance measurement of a target analyte. HCWs can be applied as a miniature gas cell for guiding UV radiation for measurement of low gas concentrations. Photodiodes, on the other hand, offer a portable UV photodetector with excellent spectral selectivity with visible rejection, minimal dark current, linearity, and resistance against UV-aging. |
format | Online Article Text |
id | pubmed-6929016 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2019 |
publisher | MDPI |
record_format | MEDLINE/PubMed |
spelling | pubmed-69290162019-12-26 Gas Detection Using Portable Deep-UV Absorption Spectrophotometry: A Review Khan, Sulaiman Newport, David Le Calvé, Stéphane Sensors (Basel) Review Several gas molecules of environmental and domestic significance exhibit a strong deep-UV absorption. Therefore, a sensitive and a selective gas detector based on this unique molecular property (i.e., absorption at a specific wavelength) can be developed using deep-UV absorption spectrophotometry. UV absorption spectrometry provides a highly sensitive, reliable, self-referenced, and selective approach for gas sensing. This review article addresses the recent progress in the application of deep-UV absorption for gas sensing owing to its inherent features and tremendous potentials. Applications, advancements, and challenges related to UV emission sources, gas cells, and UV photodetectors are assessed and compared. We present the relevant theoretical aspects and challenges associated with the development of portable sensitive spectrophotometer. Finally, the applications of UV absorption spectrometry for ozone, NO(2), SO(2), and aromatic organic compounds during the last decades are discussed and compared. A portable UV absorption spectrophotometer can be developed by using LEDs, hollow core waveguides (HCW), and UV photodetectors (i.e., photodiodes). LED provides a portable UV emission source with low power input, low-intensity drifts, low cost, and ease of alignment. It is a quasi-chromatic UV source and covers the absorption band of molecules without optical filters for absorbance measurement of a target analyte. HCWs can be applied as a miniature gas cell for guiding UV radiation for measurement of low gas concentrations. Photodiodes, on the other hand, offer a portable UV photodetector with excellent spectral selectivity with visible rejection, minimal dark current, linearity, and resistance against UV-aging. MDPI 2019-11-28 /pmc/articles/PMC6929016/ /pubmed/31795069 http://dx.doi.org/10.3390/s19235210 Text en © 2019 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/). |
spellingShingle | Review Khan, Sulaiman Newport, David Le Calvé, Stéphane Gas Detection Using Portable Deep-UV Absorption Spectrophotometry: A Review |
title | Gas Detection Using Portable Deep-UV Absorption Spectrophotometry: A Review |
title_full | Gas Detection Using Portable Deep-UV Absorption Spectrophotometry: A Review |
title_fullStr | Gas Detection Using Portable Deep-UV Absorption Spectrophotometry: A Review |
title_full_unstemmed | Gas Detection Using Portable Deep-UV Absorption Spectrophotometry: A Review |
title_short | Gas Detection Using Portable Deep-UV Absorption Spectrophotometry: A Review |
title_sort | gas detection using portable deep-uv absorption spectrophotometry: a review |
topic | Review |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6929016/ https://www.ncbi.nlm.nih.gov/pubmed/31795069 http://dx.doi.org/10.3390/s19235210 |
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