Electrochemical Polymerization Of Oriented Films Of Polythiophene Derivatives

Conducting polymers have been extensively studied and have great prospects in application since they were discovered. But their electrical conductivity are far less than of metals'. So the strategies for improving the electrical conductivity and performance of organic thin film electronic devices are diverse. Research is especially focused on synthesizing new active materials, device interface control, device structure modification and film morphology regulation. We combine electropolymerization with epitaxial to prepare oriented polythiophene derivatives and improve charge mobility in this experiment.1. The synthesis and characterization of oriented poly?3-hexylthiophene? ?P3HT? film.We obtained anisotropic P3HT films from cyclic voltammetry on oriented isotactic polypropylene ?iPP? films successfully. The orientation of P3HT was proved by methods of polarized optical micrographs ?POM?, polarized FTIR spectrometer and polarized raman and so on. We also proved that highly ordered P3HT lamellae existed in edge-on orientation on iPP film and has some angle with respect to iPP molecular chain. These P3HT films exhibit anisotropic charge mobility between the parallel and vertical to the drawing direction of films. We provide an effective method for improving the performance of the device.2. The synthesis and characterization of oriented poly?3,4-ethylenedioxythiophene? ?PEDOT? film.We obtained anisotropic PEDOT films by cyclic voltammetry on oriented high density polyethylene ?HDPE? films successfully. The morphology of films were characterized by scanning electron microscope ?SEM?. We proved the orientation of PEDOT on HDPE films by methods of POM, polarized FTIR spectrometer and polarized raman. These PEDOT films exhibit anisotropic electrical conductivity. The value in the vertical to the drawing direction of HDPE films is 5.2 S�cm^-1 which is higher than that of horizontal direction of 0.28 S�cm^-1. Significant differences of the electrical conductivity between the two directions show that epitaxial electrochemical deposition is an effective method to obtain great performance conductive polymers.