Tuning optoelectronic performances for 3-methylselenophene-EDOT hybrid polymer
Tuning optoelectronic performances for 3-methylselenophene-EDOT hybrid polymer
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调节 3-甲基硒吩-EDOT 杂化聚合物的光电性能
DOI：
10.1016/j.matchemphys.2020.122699
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发表时间：
2020-04-01
影响因子：
4.6
通讯作者：
Zhao, Guoqun
中科院分区：
文献类型：
--
作者：
Hu, Faqi;Zhang, Wenna;Zhao, Guoqun
合理设计新型高性能共轭聚合物仍然是聚合物电致变色领域的核心。本论文以3-甲基硒代噻吩（3-methylselenophene，3-MESe）为分子前体，用3，4-乙撑二氧噻吩（3，4-ethylenedioxythiophene，EDOT）封端，设计并电合成了一种新型的3-MESe-EDOT杂化聚合物。系统地研究了前驱体和杂化聚合物的结构表征、物理化学性质、微观形貌、电化学行为和电致变色性能，揭示了前驱体和杂化聚合物的结构-性能关系。具有平面结构的前体表现出比3-甲基硒代物（1.17 V）和EDOT（1.23 V）低得多的起始氧化电位（0.5 V）。低电位电聚合产生光滑和紧凑的杂化聚合物膜，具有高电导率（10（-1）S cm（-1））和在循环电负载下的优异的电化学稳定性。3-甲基硒吩-EDOT杂化聚合物在氧化过程中也表现出明显的颜色变化，从还原态的棕黄色到透明的天蓝色，具有良好的光学对比度（39%，990 nm），高的显色效率（161 cm（2）/C）和快速的响应时间（1.3 s）。
Rational design of novel high-performance conjugated polymers is still central to the field of polymer electrochromics. In this work, a novel 3-methylselenophene-EDOT hybrid polymer is designed and electrosynthesized from the molecular precursor of 3-methylselenophene end-capped with 3,4-ethylenedioxythiophene (EDOT). The structural characterization, physicochemical properties, micromorphology, electrochemical behaviors, and electrochromic performance are systematically explored to reveal the structure-property relationship of both the precursor and the hybrid polymer. The precursor with planar structure exhibits a much lower onset oxidation potential (0.5 V) than that of both 3-methylselenophene (1.17 V) and EDOT (1.23 V). Low-potential electro-polymerization yields smooth and compact hybrid polymer film with high conductivity (10(-1) S cm(-1)) and excellent electrochemical stability under cyclic electrical loads. The 3-methylselenophene-EDOT hybrid polymer also exhibits the obvious color changes from brownish yellow in the reduced to transparent sky blue upon oxidization with favorable optical contrast (39%, 990 nm), high coloration efficiency (161 cm(2)/C) and fast response time (1.3 s) under low switching voltages.