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• W2989148177 abstract "We demonstrate a detection method for heavy metal (HM) ions based on whispering gallery mode (WGM) lasing in a liquid crystal (LC) microdroplet biosensor. By doping with stearic acid, nematic LC 4-cyano-4'-pentylbiphenyl (5CB) microdroplets are biochemically functionalized and used as both optical microresonators and sensing elements. Typical WGM lasing emission is observed in stearic acid-doped 5CB microdroplets under a pulse laser pump. Our results show that quantitative spectral shift of WGMs can serve as a real-time indicator of the adsorption of HM ions on the microdroplet surface. The detection limit of our sensor is as low as 40 pM for Cu(II) ions, six orders of magnitude better than the exposure threshold defined by the World Health Organization. Furthermore, this sensing system has an ability to discriminate between heavy and light metal ions. We believe that this novel biosensor has great application potential for environmental monitoring and drinking water quality testing." @default.
• W2989148177 created "2019-11-22" @default.
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• W2989148177 date "2019-11-05" @default.
• W2989148177 modified "2023-10-17" @default.
• W2989148177 title "Detection of heavy metal ions using whispering gallery mode lasing in functionalized liquid crystal microdroplets" @default.
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• W2989148177 doi "https://doi.org/10.1364/boe.10.006073" @default.
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