Testing of Electrical Conductivity of Thin Films of Polyaniline Doped with Phosphoric Acid

This paper presents the doping of thin films of polyaniline with phosphoric acid, that was carried out in order to determine how the material that reaches a thin film affects its electrical conductivity. In the very process of obtaining polyaniline (PANI) the doping was carried out with phosphoric acid (PANI-H3PO4). The doping was performed at room temperature (20°C) and at 0°C, and after that the thin films were made. Samples of films were obtained by the method of rotating disc at different speeds. The minimum rotation speed at which a thin film of polyaniline was obtained was 600 rpm and the maximum 6000 rpm. We made 4 series of thin films of doped polyaniline, each containing 8 samples. For each sample of film, from a particular series, we measured its electrical resistance, and on the basis of that the specific electrical conductivity was calculated. Based on the analysis of the experimentally obtained results it can be concluded that the electrical conductivity of thin films doped with phosphoric acid is lower than the electrical conductivity of thin films doped with sulfuric acid (PANI-H2SO4) and hydrochloric acid (PANI-HCl).