Using Diazotization Reaction to Develop Portable Liquid-Crystal-Based Sensors for Nitrite Detection
學年 108
學期 2
出版（發表）日期 2020-05-08
作品名稱 Using Diazotization Reaction to Develop Portable Liquid-Crystal-Based Sensors for Nitrite Detection
作品名稱（其他語言）
著者 Ho, T. T.; Lan, Y.-H.; Huang, J.-W.; Chang, R.-R.; Chen, C.-H.
單位
出版者
著錄名稱、卷期、頁數 ACS Omega 5(20), 11809–11816
摘要 A liquid-crystal (LC)-based sensor for detecting nitrite in aqueous solutions was developed using a diazotization reaction as the sensing mechanism. First, tetradecyl 4-aminobenzoate (14CBA) was synthesized and doped into a nematic LC, i.e., 4-cyano-4′-pentylbiphenyl (5CB). When the LC mixture was cast on a glass substrate and then immersed into an aqueous solution without nitrite, the orientation of LC was planar and the LC image was bright. In the presence of nitrite, it reacted with alkylanilines to give corresponding diazonium ions with a positive charge, which aligned at the LC/aqueous interface to cause homeotropic orientation of LC. As a result, a bright-to-dark transition of the LC image was observed. The limit of detection (LOD) of this system for nitrite is 25 μM with high selectivity. In addition, this system can work in environmental water samples such as tap water and pond water. Finally, we demonstrated that the optical signals of LC can be measured and recorded using a built-in digital camera of a smartphone, suggesting the portability of this system for on-site applications.
關鍵字
語言 en_US
ISSN
期刊性質 國外
收錄於 SCI
產學合作
通訊作者
審稿制度 是
國別 USA
公開徵稿
出版型式 ,電子版,紙本
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機構典藏連結 ( http://tkuir.lib.tku.edu.tw:8080/dspace/handle/987654321/118707 )

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