材料科学
聚合物
芴
喹喔啉
共轭体系
荧光
铃木反应
聚合
水溶液
部分
光化学
化学工程
高分子化学
有机化学
复合材料
光学
化学
工程类
物理
烷基
芳基
作者
Seonyoung Jo,Daigeun Kim,Sang-Ho Son,Yong-Kyun Kim,Taek Seung Lee
摘要
Conjugated polymer of poly(fluorene-co-quinoxaline) was synthesized via Suzuki coupling polymerization. The emission color of the polymer can be tuned depending on the concentration of the polymer in solution. A low-energy bandgap is observed both in the concentrated solution and in the solid state, caused by aggregation of the polymer chains, resulting in long wavelength emission from the quinoxaline moiety, while short wavelength emission can be seen in diluted, well-dissolved solution. The presence of quinoxaline units enables us to demonstrate fluorescence switching and imaging. Paper-based strips containing the polymer are prepared via simple immersion of filter paper in the polymer solution for practical use in the detection of nerve agents. The emission of the paper-based strip is quenched upon exposure to diethyl chlorophosphate (DCP), a nerve agent simulant, and the initial emission intensity can be almost restored by treatment with aqueous sodium hydroxide solution, making a possible reversible paper-based sensor.
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