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Gas detection using portable deep-UV absorption spectrophotometry: a review

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dc.contributor.author Khan, Sulaiman
dc.contributor.author Newport, David
dc.contributor.author Le Calvé, Stéphane
dc.date.accessioned 2020-03-23T15:32:13Z
dc.date.available 2020-03-23T15:32:13Z
dc.date.issued 2019
dc.identifier.uri http://hdl.handle.net/10344/8636
dc.description peer-reviewed en_US
dc.description.abstract 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, NO2, SO2, 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 en_US
dc.language.iso eng en_US
dc.publisher MDPPI en_US
dc.relation 643095 en_US
dc.relation.ispartofseries Sensors;19 (23), 5210
dc.relation.uri https://doi.org/10.3390/s19235210
dc.subject deep ultraviolet en_US
dc.subject absorption spectrophotometry en_US
dc.subject spectroscopy en_US
dc.subject ultraviolet light sources en_US
dc.subject LEDs en_US
dc.subject hollow core waveguides en_US
dc.subject photodiodes en_US
dc.title Gas detection using portable deep-UV absorption spectrophotometry: a review en_US
dc.type info:eu-repo/semantics/article en_US
dc.type.supercollection all_ul_research en_US
dc.type.supercollection ul_published_reviewed en_US
dc.identifier.doi 10.3390/s19235210
dc.contributor.sponsor ERC en_US
dc.relation.projectid 643095 en_US
dc.relation.projectid 687014 en_US
dc.rights.accessrights info:eu-repo/semantics/openAccess en_US
dc.internal.rssid 2938125


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