Department of Chemistry, Pohang University of Science and Technology (POSTECH), Pohang, 790-784, Korea, ROK.
J Phys Chem B. 2010 Mar 4;114(8):2660-6. doi: 10.1021/jp9113859.
[Poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate)] (PEDOT:PSS, Baytron P) composite films were prepared under various conditions and their conductivities were studied by the current-sensing atomic force microscopy (CS-AFM) technique. Topographic and current images of pristine and additive-treated PEDOT:PSS as well as electrochemically synthesized PEDOT films were obtained in nanoscale using the CS-AFM. The as-prepared pristine PEDOT:PSS films showed a low population of conductive spots isolated by large insulating regions; both their population and the conductivities increased upon addition of a few additives to the PEDOT:PSS solution before spin-coating. From the current-voltage (I-V) traces recorded at a few representative spots of different electronic states, much improved pathways for charge percolation appeared to have been established in the additive-treated films. Electrochemically prepared PEDOT films showed much better electrical properties compared with spin-casted films of chemically prepared polymers. The conductivity of all these films was shown to be significantly enhanced by the electrochemical doping process.
[聚（3,4-亚乙基二氧噻吩）：聚（苯乙烯磺酸盐）]（PEDOT：PSS，Baytron P）复合膜在各种条件下进行制备，并通过电流感应原子力显微镜（CS-AFM）技术研究其电导率。使用 CS-AFM 在纳米尺度上获得了原始和添加剂处理的 PEDOT：PSS 以及电化学合成的 PEDOT 膜的形貌和电流图像。未经处理的 PEDOT：PSS 薄膜显示出由大的绝缘区域隔开的低导电点的存在；在旋涂之前，将少量添加剂添加到 PEDOT：PSS 溶液中，其数量和电导率均增加。从在不同电子状态的几个代表性点记录的电流-电压（I-V）迹线可以看出，在添加剂处理的薄膜中似乎已经建立了电荷渗流的改进途径。与化学制备聚合物的旋涂薄膜相比，电化学制备的 PEDOT 薄膜具有更好的电学性能。电化学掺杂过程显著提高了所有这些薄膜的电导率。
