Deciphering the quaternary structure of PEDOT:PSS aqueous dispersion with small-angle scattering
Deciphering the quaternary structure of PEDOT:PSS aqueous dispersion with small-angle scattering
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DOI：
10.1016/j.polymer.2022.125415
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发表时间：
2022-10-21
期刊：
影响因子：
4.6
通讯作者：
Zhang, Peng
中科院分区：
文献类型：
--
作者：
Liu, Zhen;Li, Xin;Zhang, Peng
溶液结构及其与聚(3,4-乙撑二氧噻吩):聚(4苯乙烯磺酸)(PEDOT:PSS)固态结构的关系决定了材料的电导率，从而决定了器件的性能。在这项工作中，我们通过一套复杂且互补的结构表征技术（包括小角 X 射线散射 (SAXS) 和小角中子散射 (SANS)）破译了 PEDOT:PSS 的多级结构。 SAXS 和 SANS 结果表明，PEDOT:PSS 在水分散体中形成导电网络，这归因于四元结构。双(三氟甲磺酰基)亚胺锂盐的二次掺杂显着改变了PEDOT:PSS的四级结构，从而增强了薄膜的电导率。此外，我们分别通过 SAXS 和电阻测量原位研究了溶剂蒸发过程中四元结构的变化和样品电阻，这提供了有关结构-性能相关性的详细和基础知识。这些基础知识将指导先进柔性电子产品的设计和制备。
Solution structure and its relationship with the solid-state structure of poly(3,4-ethylenedioxythiophene): poly(4styrenesulfonic acid) (PEDOT:PSS) determined the materials' conductivity and thus devices' performance. In this work, we deciphered the multi-level structure of PEDOT:PSS with a set of sophisticated and complementary structural characterization techniques consisting of small-angle X-ray scattering (SAXS) and small-angle neutron scattering (SANS). SAXS and SANS results disclosed that the PEDOT:PSS formed a conductive network in the aqueous dispersion, which was ascribed to a quaternary structure. Secondary doping with lithium bis(trifluoromethanesulfonyl)imide salt significantly changed the quaternary structure of PEDOT:PSS and thus enhanced the film conductivity. In addition, we studied in situ the change of quaternary structure and the sample resistance during solvent evaporation with SAXS and resistance measurements, respectively, which provided detailed and fundamental knowledge about the structure-property correlations. This fundamental knowledge would guide the design and preparation of advanced flexible electronics.