IN-SITU ELECTROCHEMICAL ESR INVESTIGATIONS OF THE GROWTH OF ONE-DIMENSIONAL AND 2-DIMENSIONAL POLYPYRROLE FILMS

In situ ESR-spectroscopic investigations of the electrochemical growth of polypyrrole (PPy) in 0.1 mol dm(-3) toluene sulfonic acid solution in acetonitrile are presented. The films were deposited potentiostati cally and galvanostatically onto gold electrodes. ESR spectra were sim ultaneously recorded during electrodeposition processes at high and lo w current densities, respectively. Differences in the paramagnetic pro perties of the PPy films thus prepared have been observed depending on the applied current densities. Furthermore, the spin concentration in the PPy film is not proportional to the injected charge. Therefore, t wo different mechanisms of film formation occur depending on the appli ed current densities.