CHARGE-TRANSFER IN POLY(O-TOLUIDINE) GOLD MODIFIED ELECTRODES - AN EIS STUDY OF THE REDUCED-STATE

The impedance response of poly(o-toluidine) (POT) electrochemically gr own films was studied in the potential range, 0.0 < E < 0.35 V, where the polymer is in the insulating state. The electrolytes employed were aqueous solutions of H2SO4 and HClO4 with different concentrations. T he predominant impedance parameters in this potential range, the charg e transfer resistance, R-CT, in parallel with the corresponding double laver capacitance, C-dl, were considered in terms of the applied pote ntial, the polymer film thickness and the nature and concentration of the electrolyte. (C) 1998 Elsevier Science S.A. All rights reserved.