Electron localization length in polyaniline

Electrical DC conductivity, magnetic susceptibility, and EPR measurements are used to investigate the electron localization behavior of polyaniline as a function of the dopant type using seven sulfonic acid based doping acids. In spite of differences in the magnitude and the temperature dependences of DC conductivity and magnetic susceptibility data, the experiments reveal a localization length of approximately 30 إ for all the samples. We conclude that this result is essentially due to disorder in the basic morphological structure of a polymer that seems to be determined, among other factors, by the nature of the monomeric units comprising the polymer chains.