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Proceedings Paper

Highly sensitive & selective detection of organophosphate nerve agent and pesticide based on a reusable liquid-crystal optical sensor (Conference Presentation)
Author(s): Fengjie He; Xingliang Xiong; Hui Zhao; Shengjie Zhai

Paper Abstract

Organophosphates (OPs) are a class of pesticides and chemical warfare, several of which are highly toxic. Based on the newest report, there are nearly three million poisonings per year resulting in two hundred thousand deaths around the world. Inspired by the Liquid Crystals (LCs)’ extraordinary properties, we employed a customized LCs sensor to detect OPs with high sensitivity & selectivity, fast response time, and reusability. As proof of our research, four different measurements were operated in the experiments: sensitivity, response time, selectivity, and reusability. The results showed that the limit of detection (LOD) of our proposed sensing method can selectively detect OPs lower to the 10ppb concentration in 25 seconds in four different vapors (OPs, Steam, Ethyl alcohol, and Methylbenzene), which was far lower than the US EPA safety levels for OPs and also faster than the other competitors. Further, the sensor can be recovered by the nitrogen gas treatment in 30 seconds.

Paper Details

Date Published: 10 March 2020
Proc. SPIE 11251, Label-free Biomedical Imaging and Sensing (LBIS) 2020, 112510T (10 March 2020); doi: 10.1117/12.2546872
Show Author Affiliations
Fengjie He, Univ. of Nevada, Las Vegas (United States)
Xingliang Xiong, Chongqing Medical Univ. (China)
Hui Zhao, Univ. of Nevada, Las Vegas (United States)
Shengjie Zhai, Univ. of Nevada, Las Vegas (United States)

Published in SPIE Proceedings Vol. 11251:
Label-free Biomedical Imaging and Sensing (LBIS) 2020
Natan T. Shaked; Oliver Hayden, Editor(s)

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