Abstract
The conductivity of polypyrrole films has been enhanced by electrochemical post-deposition doping with various anions. The change of conductivity was found to depend on the type and concentration of the anion. Results for the polypyrrole films doped with anions of H2SO4, (C2H5)4N(O3SC6H4CH3), KI, CH3C6H4SO3H · H2O (p-toluene sulphonic acid monohydrate), AlCl3, KBrO3 and HNO3 showed that in the case of H2SO4, (C2H5)4 N(O3SC6H4CH3) and CH3C6 H4SO3 H · H2O the conductivity can be enhanced by up to a factor of two, from a value of 67 S cm−1 up to 165, 102 and 95 S cm−1, respectively. Doping with I− had a negligible effect on the conductivity which was about 71 S cm−1, while in the case of AlCl3, KBrO3 and HNO3 the conductivity of the polypyrrole decreased significantly for certain anion concentrations.
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