Highly sensitive & selective detection of organophosphate nerve agent and pesticide based on a reusable liquid-crystal optical sensor (Conference Presentation)

Fengjie He; Xingliang Xiong; Hui Zhao; Shengjie Zhai

doi:10.1117/12.2546872

10 March 2020 Highly sensitive & selective detection of organophosphate nerve agent and pesticide based on a reusable liquid-crystal optical sensor (Conference Presentation)

Fengjie He, Xingliang Xiong, Hui Zhao, Shengjie Zhai

Author Affiliations +

Proceedings Volume 11251, Label-free Biomedical Imaging and Sensing (LBIS) 2020; 112510T (2020) https://doi.org/10.1117/12.2546872
Event: SPIE BiOS, 2020, San Francisco, California, United States

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.

Conference Presentation

Citation Download Citation

Fengjie He, Xingliang Xiong, Hui Zhao, and Shengjie Zhai "Highly sensitive & selective detection of organophosphate nerve agent and pesticide based on a reusable liquid-crystal optical sensor (Conference Presentation)", Proc. SPIE 11251, Label-free Biomedical Imaging and Sensing (LBIS) 2020, 112510T (10 March 2020); https://doi.org/10.1117/12.2546872

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KEYWORDS

Liquid crystals

Sensors

Nerve agents

Optical sensors

Copper

Chemical weapons

Molecular interactions

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