In-situ polymerized polyaniline films

Polyaniline hydrochloride was prepared by the oxidation of aniline hydrochloride with ammonium peroxodisulfate in dilute hydrochloric acid. The polyaniline films were produced during the polymerization on the glass surfaces immersed in the reaction mixture. The surface composition of the film was characterized by X-ray photoelectron spectroscopy. The thickness of the films df was determined by the optical interferometry and linked to their optical absorption at the wavelength 400 nm, A400=(5.4±0.2)×10−3 df (in nm). The effect of the polymerization temperature and concentration of the reactants on the thickness and electrical properties of polyaniline films are reported. The electrical conductivity of the films and of bulk polyaniline produced simultaneously is about the same. A relation between the thickness of the films and the molecular weight of the produced polyaniline was found.