Structural and electrical characterization of the chromatic transitions when doping spin-coated polyaniline films

Abstract

The color changes occurring during the doping of polyaniline films was investigated structurally and electrically. PAni was chemically synthesized and was formed into films by spreading and spin-coating on a glass substrate. The films were then doped by exposure to sulfuric and hydrochloric acid. The color changes during doping were noted as observed and characterized using a Fourier Transform Infrared Spectroscometer (FTIR) and linear four-point probe. The color change from dark blue to green was witnessed through observation and photographs taken. Actual doping was shown by the results of the FTIR and four-point probe wherein sulfuric acid-doped spin-coated PAni films gained highest conductivity.