Hu Yongjing, Liu Xiaofang, Jiang Fengxing, Zhou Weiqiang, Liu Congcong, Duan Xuemin, Xu Jingkun
Department of Physics, Jiangxi Science and Technology Normal University , Nanchang 330013, China.
J Phys Chem B. 2017 Oct 5;121(39):9281-9290. doi: 10.1021/acs.jpcb.7b05217. Epub 2017 Sep 25.
Conductive thiophene-based polymers have garnered great attention for use in organic electron materials such as electrochromic and thermoelectric materials. However, they suffer from poor electron transport properties and long-term stability, leading to limited development eventually. Here, we proposed a strategy of functionalized thiophene-based polymers with oligo(ethylene glycol) or alkyl side chains and synthesized a series of poly(3,4-ethylenedioxy bithiophene)s (PEDTs) to tune their electrochromic and thermoelectric properties. An alkyl group bearing electronic ability at the thiophene ring effectively achieved a large increase in the electrical conductivity with nearly invariable Seebeck coefficient, resulting in an enhancement by 1 order of magnitude for the thermoelectric power factor. Moreover, the electrochromic properties of functionalized PEDTs gained an effective improvement in the optical contrast and coloration efficiency as well as stability with multicolor changes between neutral and oxidized states. The functionalized PEDTs can be proposed as an alternative strategy to tune the electrochromic and thermoelectric properties for organic polymer materials.
导电的噻吩基聚合物作为有机电子材料，如用于电致变色和热电材料等方面，已引起了广泛关注。然而，它们存在电子传输性能差和长期稳定性不佳的问题，最终导致发展受限。在此，我们提出了一种用低聚（乙二醇）或烷基侧链对噻吩基聚合物进行功能化的策略，并合成了一系列聚（3,4 - 亚乙基二氧噻吩）（PEDT）以调节其电致变色和热电性能。在噻吩环上带有电子能力的烷基有效地实现了电导率的大幅提高，同时塞贝克系数几乎不变，使得热电功率因数提高了1个数量级。此外，功能化PEDT的电致变色性能在光学对比度、着色效率以及中性和氧化态之间的多色变化稳定性方面都得到了有效改善。功能化PEDT可被视为一种调节有机聚合物材料电致变色和热电性能的替代策略。
