Zhang Mingxing, Chen Junchang, Wang Minglei, Yuan Mengjia, Li Rong, Feng Xinxin, He Yulong, Mao Xuanzhi, Li Yulong, Xiong Zhi, Xing Zhe, Hu Jiangtao, Wu Guozhong
Shanghai Institute of Applied Physics, Chinese Academy of Sciences, No. 2019 Jialuo Road, Jiading District Shanghai 201800, China.
University of Chinese Academy of Sciences, Beijing 100049, China.
ACS Appl Mater Interfaces. 2021 Feb 24;13(7):9036-9042. doi: 10.1021/acsami.0c23132. Epub 2021 Feb 15.
Conventional aromatic compounds tend to exhibit the formation of sandwich-shaped excimers and exciplexes between their excited and ground states at high concentrations or in their aggregated states, causing their fluorescence to weaken or disappear due to the aggregation-caused quenching (ACQ) effect. This limits their applications in concentrated solutions or solid materials. Herein, for the first time, ACQ-based pyrene (Py) units are covalently connected to the surface of polyethylene/polypropylene nonwoven fabric (PE/PP NWF) via electron beam preradiation-induced graft polymerization followed by chemical modification. The matrix can be considered a solid solvent and Py units as a solid solute, such that the amount of Py units can be controlled by varying the reaction time. The obtained fluorescent fabric not only exhibits remarkable fluorescence properties with high fluorescence intensity, high quantum yield (>90%), and excellent fluorescence stability after laundering or in harsh chemical environments, but the fluorescence color and intensity, quantum yield, and lifetime can also be regulated by employing the ACQ effect. Additionally, the as-prepared fluorescent fabric can effectively distinguish common monocyclic aromatic hydrocarbons via a simple fluorescence response test.
传统芳香族化合物在高浓度或聚集态下，其激发态与基态之间往往会形成夹心型激基缔合物和激基复合物，由于聚集诱导猝灭（ACQ）效应导致其荧光减弱或消失。这限制了它们在浓溶液或固体材料中的应用。在此，首次通过电子束预辐照诱导接枝聚合，随后进行化学改性，将基于ACQ的芘（Py）单元共价连接到聚乙烯/聚丙烯无纺布（PE/PP NWF）表面。基体可被视为固体溶剂，Py单元作为固体溶质，这样Py单元的量可以通过改变反应时间来控制。所得荧光织物不仅具有显著荧光性能，荧光强度高、量子产率高（>90%），且在洗涤后或恶劣化学环境中具有优异的荧光稳定性，而且通过利用ACQ效应还可以调节荧光颜色和强度、量子产率以及寿命。此外，所制备 的荧光织物通过简单的荧光响应测试能够有效区分常见的单环芳烃。
