Electrochemical characteristics, and morphology of the polypyrrole (PPy) films prepared in aqueous and nonaqueous (acetonitrile) solutions by electrochemical techniques have been studies and the results are reported. Electrochemical parameters studied include exchange rate constants for electron transfer reactions and capacitances for the films. PPy films prepared in acetonitrile are found to be superior to those prepared in aqueous medium for in their electron transfer characteristics and conductivities. These along with the fact that films prepared in water are more porous than their counterparts in acetonitrile are explained in term of the morphology of films. The polarity and nucleophilicity of the solvent used for the synthesis of PPy films are found to determine morphology of the PPy films.
