A complete understanding of single electron behavior in mesoscopic conjugated polymers is necessary for the development of advanced organic light emitting diodes, spintronics, flexible electronics and bioelectronics. In this study, we investigate the charge dynamics of conjugated polymer nanowires (CPNWs), synthesized using polypyrrole (PPy) and poly (3, 4- ethylenedioxythiophene) (PEDOT) and having diameters of 100 and 200 nm. The electrical properties and magnetic behavior of charges at the localized doping sites are probed using temperature dependent I–V analysis and electron paramagnetic resonance (EPR) spectroscopy. The I–V curves indicate that the applied bias and the diameter of the CPNWs, as well as their crystallinity, are important factors for charge injection and transport along the polymer chain. The EPR experiments show a relative increase in the spin relaxation time of PPy whereas a corresponding decrease is observed for PEDOT, as the diameter decreases. Based on the experimental results, the size effect and the interaction between charge carriers within the one-dimensional conducting polymer are discussed considering the doping states. These results are expected to extend the understanding of electronic behaviors in mesoscopic conjugated polymers.

要开发先进的有机发光二极管，自旋电子学，柔性电子学和生物电子学，必须全面了解介观共轭聚合物中的单电子行为。在这项研究中，我们研究了共轭聚合物纳米线（CPNWs）的电荷动力学，共轭聚合物纳米线是使用聚吡咯（PPy）和聚（3，4-乙二氧基噻吩）（PEDOT）合成的，直径分别为100和200 nm。使用依赖于温度的IV分析和电子顺磁共振（EPR）光谱探测局部掺杂位点处电荷的电学性质和磁行为。I–V曲线表明，CPNW的施加偏压和直径以及其结晶度是电荷注入和沿聚合物链传输的重要因素。EPR实验表明，随着直径的减小，PPy的自旋弛豫时间相对增加，而PEDOT则相应减少。根据实验结果，讨论了一维导电聚合物内部的尺寸效应和电荷载体之间的相互作用。预期这些结果将扩展对介观共轭聚合物中电子行为的理解。