Influence of doping anion on electrochemical and physical properties of polyselenienyl thiophene polymer

The effect of counter ions on electrochemical and physical properties of polyselenienyl thiophene (PSeT) films was investigated. sThe films were prepared by anodic oxidation of selenienyl thiophene in acetonitrile using PF6, ClO4, BF4 and CF3SO3 as the doping anion. Electrochemical characterization of these films using the same electrolyte as that used for electrosynthesis shows that their electrochemical properties are mainly controlled by the anion. The influence of the electrolyte on the morphology and the conductivity of PSeT films has been analysed. We have demonstrated an anion effect that can be related to the size of the counter ion. Fourier transform infrared (FT-IR) spectra of polymer with various doping species have been obtained. The bands specific to each doping species are distinctly observable for the doped PSeT films.