In-situ polymerized polyaniline films

Polyaniline hydrochloride was prepared by the oxidation of aniline hydrochl oride with ammonium peroxodisulfate in dilute hydrochloric acid. The polyan iline films were produced during the polymerization on the glass surfaces i mmersed in the reaction mixture. The surface composition of the film was ch aracterized by X-ray photoelectron spectroscopy. The thickness of the films di was determined by the optical interferometry and linked to their optica l absorption at the wavelength 400 nm, A(400) = (5.4 +/- 0.2) x 10(-3) d(f) (in nm). The effect of the polymerization temperature and concentration of the react ants on the thickness and electrical properties of polyaniline f ilms are reported. The electrical conductivity of the films and of bulk pol yaniline produced simultaneously is about the same. A relation between the thickness of the films and the molecular weight of the produced polyaniline was found. (C) 1999 Elsevier Science S.A. All rights reserved.