Structural control of mixed ionic and electronic transport in conducting polymers.
Structural control of mixed ionic and electronic transport in conducting polymers.
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DOI：
10.1038/ncomms11287
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发表时间：
2016-04-19
影响因子：
16.6
通讯作者：
Malliaras GG
中科院分区：
文献类型：
--
作者：
Rivnay J;Inal S;Collins BA;Sessolo M;Stavrinidou E;Strakosas X;Tassone C;Delongchamp DM;Malliaras GG
用聚（苯乙烯磺酸盐）掺杂的聚（3，4-乙撑二氧噻吩），PEDOT：PSS，已经被用作稳定的、可溶液加工的空穴导体超过二十年。虽然其空穴传输特性一直是深入研究的主题，但最近的工作已经转向PEDOT：PSS作为混合离子/电子导体，应用于生物电子学，能量存储和管理以及软机器人。导电聚合物在充分水合时可以有效地传输空穴和离子，然而，关于形态对混合导电的作用知之甚少。在这里，我们表明，体离子和电子迁移率同时受到加工引起的纳米和介观尺度结构的变化在PEDOT：PSS薄膜。我们量化域组合物，并发现域纯化上添加分散共溶剂限制离子迁移率，即使电子电导率提高。我们表明，最佳形态允许平衡的离子和电子传输，这是至关重要的原型混合导体器件。这些发现可能为合理设计聚合物材料和工艺路线铺平道路，以增强依赖于混合传导的器件。导电聚合物在生物电子学和软机器人等领域有着广阔的应用前景，但其形态对混合导电的影响却知之甚少。在这里，作者展示了如何批量离子/电子输运的影响，在纳米和介观尺度的结构在PEDOT：PSS薄膜的变化。
Poly(3,4-ethylenedioxythiophene) doped with poly(styrenesulfonate), PEDOT:PSS, has been utilized for over two decades as a stable, solution-processable hole conductor. While its hole transport properties have been the subject of intense investigation, recent work has turned to PEDOT:PSS as a mixed ionic/electronic conductor in applications including bioelectronics, energy storage and management, and soft robotics. Conducting polymers can efficiently transport both holes and ions when sufficiently hydrated, however, little is known about the role of morphology on mixed conduction. Here, we show that bulk ionic and electronic mobilities are simultaneously affected by processing-induced changes in nano- and meso-scale structure in PEDOT:PSS films. We quantify domain composition, and find that domain purification on addition of dispersion co-solvents limits ion mobility, even while electronic conductivity improves. We show that an optimal morphology allows for the balanced ionic and electronic transport that is critical for prototypical mixed conductor devices. These findings may pave the way for the rational design of polymeric materials and processing routes to enhance devices reliant on mixed conduction. Conducting polymers are promising materials for applications including bioelectronics and soft robotics, but little is known about how morphology affects mixed conduction. Here, the authors show how bulk ionic/electronic transport is affected by changes in nano- and meso-scale structure in PEDOT:PSS films.