Electrochemical copolymerization of diphenylamine ͑DPA͒ with 2,5-diaminobenzenesulfonic acid ͑DABSA͒ was carried out in aqueous 4 M H 2 SO 4 by employing cyclic voltammetry ͑CV͒. Copolymer films were grown for different molar concentration ratios of DPA and DABSA. Electrochemical homopolymerization of DPA alone was also carried out under similar conditions. UV-visible spectroelectrochemical studies were performed to add evidence for copolymer formation when electropolymerization was performed

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... th DPA and DABSA. A growth equation for the deposition of copolymer film was deduced as Q G ϭ k ͓DPA͔ 1.02 ͓DABSA͔ Ϫ0.69 C n 1.2 , where C n is the number of cycles in CV, by utilizing the charge associated with film deposition. X-ray photoelectron spectroscopy was used to find the elemental composition of copolymer and changes in redox characteristics of the copolymer in comparison with poly͑diphenylamine͒.