Electrochemical copolymerization of o-anisidine with ethyl 4-aminobenzoate was carried out in aqueous 0.1 M HClO4 by employing cyclic voltammetry. Copolymer films were grown for different molar concentration ratios of ethyl 4-aminobenzoate. Electrochemical homopolymerizations of o-anisidine and ethyl 4-aminobenzoate were carried out independently under similar conditions. The copolymers exhibited high solubility in many polar solvents. The scan rate exerted good influence on the polymer effect on this glassy carbon electrode copolymer film, revealing electroactive film's excellent adherent properties. Spectroelectrochemical studies of the copolymer film were carried out on indium tin oxide plates. The copolymer was characterized by FTIR spectral data. The surface morphology was studied using SEM and TEM analysis. The electrical conductivity of copolymer was measured by four-probe conductivity meter. (C) 2011 Elsevier Ltd. All rights reserved.