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• W2990249025 endingPage "5210" @default.
• W2990249025 startingPage "5210" @default.
• W2990249025 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." @default.
• W2990249025 created "2019-12-05" @default.
• W2990249025 creator A5029356068 @default.
• W2990249025 creator A5030867937 @default.
• W2990249025 creator A5036270123 @default.
• W2990249025 date "2019-11-28" @default.
• W2990249025 modified "2023-10-17" @default.
• W2990249025 title "Gas Detection Using Portable Deep-UV Absorption Spectrophotometry: A Review" @default.
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• W2990249025 doi "https://doi.org/10.3390/s19235210" @default.
• W2990249025 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/6929016" @default.
• W2990249025 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/31795069" @default.
• W2990249025 hasPublicationYear "2019" @default.

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