College of Materials Science and Engineering, Huaqiao University, Xiamen 361021, China.
Department of Polymer Chemistry and Technology, Kaunas University of Technology, K. Barsauskog. 59, 51423 Kaunas, Lithuania.
Sensors (Basel). 2018 May 15;18(5):1565. doi: 10.3390/s18051565.
An aggregation-caused quenching (ACQ)-active polymer (PF), an aggregation-induced emission (AIE)-active polymer (PFTPE) and an aggregation-enhanced emission (AEE)-active polymer (PTTPE) were synthesized by tetraphenylethane (TPE), fluorene and thiophene moieties. Polyurethane (PU) foams modified by PF, PFTPE and PTTPE, namely PU-PF, PU-PFTPE and PU-PTTPE, using ultrasonication-assisted method have been prepared. A comparative study of PU-PF, PU-PFTPE and PU-PTTPE for detection explosives had been performed, and significant fluorescence quenching was observed with the introduction of PA solutions. The as-prepared PU-PF, PU-PFTPE and PU-PTTPE sensors exhibited a superior sensitivity for PA solutions with different concentrations. Remarkably, PU-PF gave a quenching efficiency of 96.2%, higher than 93.5% for PU-PFTPE and 86.7% for PU-PTTPE at a PA concentration of 180 µg·mL in methanol, which was attributed to the effective energy transfer from the fluorophore (PF) to the nitro explosive (PA). This suggested that some ACQ polymers, applied to detect explosives, could afford better performances than AIE or AEE polymers through modification of structures and selection of adequate carriers. At the same time, these chemical sensors can be recycled many times.
通过四苯乙烯（TPE）、芴和噻吩部分合成了聚集诱导猝灭（ACQ）活性聚合物（PF）、聚集诱导发光（AIE）活性聚合物（PFTPE）和聚集增强发光（AEE）活性聚合物（PTTPE）。采用超声辅助法制备了由 PF、PFTPE 和 PTTPE 改性的聚氨酯（PU）泡沫，即 PU-PF、PU-PFTPE 和 PU-PTTPE。对用于检测爆炸物的 PU-PF、PU-PFTPE 和 PU-PTTPE 进行了比较研究，发现随着 PA 溶液的引入，出现了明显的荧光猝灭。所制备的 PU-PF、PU-PFTPE 和 PU-PTTPE 传感器对不同浓度的 PA 溶液表现出优异的灵敏度。值得注意的是，在甲醇中 PA 浓度为 180 µg·mL 时，PU-PF 的猝灭效率为 96.2%，高于 PU-PFTPE 的 93.5%和 PU-PTTPE 的 86.7%，这归因于荧光团（PF）与硝基炸药（PA）之间的有效能量转移。这表明，通过修饰结构和选择合适的载体，一些应用于检测爆炸物的 ACQ 聚合物可以提供比 AIE 或 AEE 聚合物更好的性能。同时，这些化学传感器可以多次回收。
