N型导电聚合物中的二维电子输运
近日，湖南大学袁达飞团队研究了N型导电聚合物中的二维电子输运。2026年1月28日，《美国化学会志》发表了这一成果。
链内电荷离域受限与链间跳跃传输效率低下，被认为是严重制约有机导电聚合物电导率的关键因素。相较于链内电子传输，在n型导电聚合物中实现高效的链间传输仍面临重大挑战。通过引入共轭抗衡离子并保持弱库仑相互作用，可在聚合物链间形成电子离域，从而构建二维传输通道并显著提升电导率。
研究组分析了高掺杂N型导电聚合物聚苯并二呋喃二酮与不同价态阳离子的离子交换过程。其中，质子（H+）在PBFDO上的二价阳离子交换可显著提升电导率，这归因于库仑相互作用减弱与链间电荷传输增强共同促进了电子传输能力的提升与微观结构的优化。值得注意的是，紧密的分子间堆叠和增强的电子传输共同引起了电子态密度的重新分布，这些效应协同促成了二价阳离子交换后材料的金属导电行为。该工作凸显了二价阳离子交换策略作为调控N型导电聚合物电子特性的通用工具的潜力，为下一代有机电子器件的发展开辟了新路径。
附：英文原文
Title: Two-Dimensional Electron Transport in N-Type Conducting Polymers by Dication Exchange
Author: Fu Zeng, Changhao Ding, Qiuying Huang, Fei Xie, Qiaoyu Guo, Aishwarya Krishnamoorthy, Tongzi Li, Huawei Hu, Yizhou Yang, Mingquan Xu, Ye Zou, Xuechen Jiao, Keqiu Chen, Dafei Yuan
Issue&Volume: January 28, 2026
Abstract: The limitation of intrachain charge delocalization and the low efficiency of interchain hopping transport are known to greatly impede the electrical conductivity of organic conducting polymers. In comparison with intrachain electron transport, the achievement of efficient interchain transport remains a significant challenge in n-type conducting polymers. Electron delocalization between polymer chains upon introducing conjugated counterions while keeping weak Coulombic interactions is able to form two-dimensional transport ways and greatly increase the electrical conductivity. In this work, we investigated the ion-exchange process in a highly doped n-type conducting polymer, named poly(benzodifurandione) (PBFDO), with cations of varied valence states. Among them, dication exchange of proton (H+) on PBFDO resulted in significantly enhanced electrical conductivity, which was attributed to the increased electron transport and an improved microstructure, by diminished Coulomb interactions and a strong interchain charge transport. Notably, the tight intermolecular stacking and enhanced electron transport led to the redistribution of electron density of states which together contributed to the metallic conduction behavior after the dication exchange. This work highlights the potential of the dication-exchange strategy as a versatile tool for tailoring the electronic properties of n-type conducting polymers, paving the way for next-generation organic electronic devices.
DOI: 10.1021/jacs.5c17758
Source: https://pubs.acs.org/doi/abs/10.1021/jacs.5c17758
