近日，云南大学丁军桥团队研究了用于高性能有机电化学晶体管的可拉伸铟二噻吩基侧链聚合物。2025年8月7日出版的《中国化学》杂志发表了这项成果。

有机混合离子电子导体（OMIECs）的力学和电学性能的结合对于其在生物主题的柔性、可拉伸有机电化学晶体管（OECT）中的应用至关重要。

然而，对OMIEC的力学和电学性能同时调节的研究仍然有限。研究组设计了聚[吲哚二噻吩-alt-3,3'；-二甲氧基-2,2'；-二噻吩]（IDT-OTOT）基聚合物，通过改变乙二醇与烷基侧链的比例（从100%到50%）来微调其机械性能和电性能之间的平衡。

该研究结果表明，当乙二醇与烷基侧链的比例降低到80%时，所得聚合物P80-gIDT-OTOT具有优异的拉伸性，并且与其他同类聚合物相比，电荷载流子迁移率和体积电容（μC*）的产物增强，同时器件稳定性也有所提高。使用P80-gIDT-OTOT的oect表现出出色的性能和显著的稳定性。

此外，用拉伸后的P80-gIDT-OTOT构建的OECT在10-50%的拉伸范围内具有应变无关特性，突出了其优异的力学性能。这项工作建立了侧链与OMIEC机械和电气性能之间的结构-性能关系，这将有利于推进下一代柔性和可穿戴生物电子学。

附：英文原文

Title: Side-Chain Engineering Enabled Stretchable Indacenodithiophene-Based Polymers for High-Performance Organic Electrochemical Transistors†

Author: Yimin Sun, Jiali Luo, Shaodan Cai, Chao Deng, Qilin Peng, Yongqiang Shi, Hongxiang Li, Jianhua Chen, Junqiao Ding

Issue&Volume: 2025-08-07

Abstract: The combination of mechanical and electrical properties in organic mixed ion-electron conductors (OMIECs) is crucial for their application in flexible, stretchable organic electrochemical transistors (OECT) intended for biological use. However, research on the simultaneous regulation of both the mechanical and electrical properties of OMIECs remains limited. In this work, poly[indacenodithiophene-alt-3,3'-dimethoxy-2,2'-bithiophene] (IDT-OTOT) based polymers were designed to finetune the balance between their mechanical and electrical properties by varying the ratios of ethylene glycol to alkyl side chains (from 100% to 50%). Our findings indicate that when the ratio of ethylene glycol to alkyl side chains was reduced to 80%, the resulting polymer P80-gIDT-OTOT exhibited superior stretchability as well as an enhanced product of the charge carrier mobility and volumetric capacitance (μC*), along with improved device stability compared to other counterparts. The OECTs utilizing P80-gIDT-OTOT demonstrated outstanding performance and remarkable stability. Furthermore, OECTs constructed with stretched P80-gIDT-OTOT exhibited strain-independent characteristics within a stretching range of 10–50%, highlighting its excellent mechanical properties. This work establishes a structure-property relationship between side chains and the mechanical and electrical properties of OMIECs, which will be beneficial for advancing next-generation flexible and wearable bioelectronics.

DOI: 10.1002/cjoc.70198

Source: https://onlinelibrary.wiley.com/doi/10.1002/cjoc.70198