Zhang Yumin, Li Huanran, Wu Qing-Yun, Gu Lin
School of Chemical Engineering and Technology, Sun Yat-sen University, Zhuhai, China.
Front Chem. 2022 Aug 11;10:970033. doi: 10.3389/fchem.2022.970033. eCollection 2022.
In this work, a dispersible graphene-based material with a characteristic of aggregation-induced emission (AIE) was prepared by wet chemical reduction of graphene oxide (GO). During the GO reduction process, a conjugated molecule TPEP containing tetraphenylethylene (TPE) and pyrene was employed as a stabilizer because of the -π interactions and the wrapping effect. The as-prepared rGO-TPEP not only has good dispersion in solution but also processes the AIE feature. Its fluorescence intensity is 2.23 times higher than that of TPEP at the same condition. The unique optical properties and AIE effect enable the rGO-TPEP as a chemical sensor for highly sensitive explosive detection in aggregated state and solid state. In the aggregated state, trace 2,4-dinitrotoluene (DNT) can be detected by the rGO-TPEP even when the concentration is as low as 0.91 ppm, and the quenching constant is as high as 2.47 × 104 M.
在本工作中，通过湿化学还原氧化石墨烯（GO）制备了一种具有聚集诱导发光（AIE）特性的可分散石墨烯基材料。在GO还原过程中，由于-π相互作用和包裹效应，含有四苯乙烯（TPE）和芘的共轭分子TPEP被用作稳定剂。所制备的rGO-TPEP不仅在溶液中具有良好的分散性，而且具有AIE特性。在相同条件下，其荧光强度比TPEP高2.23倍。独特的光学性质和AIE效应使rGO-TPEP成为一种用于聚集态和固态高灵敏度爆炸物检测的化学传感器。在聚集态下，即使浓度低至0.91 ppm，rGO-TPEP也能检测到痕量的2,4-二硝基甲苯（DNT），猝灭常数高达2.47×104 M。
