Principles and Applications of Aggregation-Induced Emission
Principles and Applications of Aggregation-Induced Emission
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DOI：
10.1007/978-3-319-99037-8
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发表时间：
2019
期刊：
影响因子：
--
通讯作者：
Youhong Tang;B. Tang
中科院分区：
文献类型：
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作者：
Youhong Tang;B. Tang
含有四苯乙烯（TPE）衍生物作为红色发射AIE荧光团（AIEgen）的PMMA薄膜被证明对挥发性有机化合物（VOCs）和热应力都很敏感。合成了一种新型AIE荧光团（TPE_RED），并以其为引发剂，通过原子转移自由基聚合（ATRP）制备了发红光的聚甲基丙烯酸甲酯聚合物（PMMA_TPE_RED 1.5）。旋涂薄膜（厚度为2 μm）的传感性能表现出显着的蒸发变色时，暴露于挥发性有机化合物，其特征在于高蒸气压和有利的相互作用与聚合物基体。值得注意的是，PMMA_TPE_RED 1.5在CHCl 3蒸气浓度为40 ppm时已经显示出显著的蒸发变色，这比我们实验室使用相同设备记录的蒸发变色小约四倍。在含有物理混合的TPE_RED或文献中已经测试的另一种基于TPE的衍生物的PMMA膜的情况下，该阈值甚至进一步降低，即，巴比妥酸官能化的四苯乙烯衍生物（TPE-HPh-Bar）。含有TPE_RED AIEgen的PMMA膜也对温度变化敏感，显示出接近聚合物基质的玻璃化转变温度的明显热致变色响应。
PMMA films containing tetraphenylethylene (TPE) derivatives as red-emissive AIE fluorophores (AIEgen) were demonstrated to be sensitive to both volatile organic compounds (VOCs) and thermal stress. Notably, a novel AIE fluorophore (TPE_RED) was synthesized and used as the initiator to prepare red-emitting poly(methyl methacrylate) polymers (PMMA_TPE_RED1.5) via atom transfer radical polymerization (ATRP). The sensing performances of the spin-coated films (thickness of 2 μm) demonstrated significant vapochromism when exposed to VOCs characterized by high vapour pressure and favourable interaction with the polymer matrix. It was worth noting that PMMA_TPE_RED1.5displayed substantial vapochromism already at concentration of CHCl3vapours of 40 ppm, which is about four times smaller than those ever registered in our laboratory with the same apparatus. This threshold was even more decreased in the case of PMMA films containing the TPE_RED physically mixed or another TPE-based derivative already tested in literature, i.e., the barbituric acid-functionalized tetraphenylethene derivative (TPE-HPh-Bar). PMMA films containing TPE_RED AIEgen resulted also sensitive to temperature variations showing an evident thermochromic response close to the glass transition temperature of the polymer matrix.