OPTICAL AND MORPHOLOGICAL INVESTIGATIONS OF ELECTROCHEMICALLY DEPOSITED POLY (N-METHYL ANILINE) FILMS

Poly (N-methyl aniline) films have been deposited electrochemically on polyaniline coated electrodes for the first time. The influence of mo nomer concentration on the optical and morphological properties of the films was investigated. The optical spectra of the films reveal selec tive deposition of the conducting emeraldine salt phase of the polymer at lower monomer concentration while formation of mixed phases is obs erved at higher monomer concentration. However, the conducting phase o btained at the lower concentration of 0.2 M exhibits poor morphology i n contrast to the uniform morphology observed at a higher concentratio n of 0.8 M. Further, a transition from fibrillar to granular nature is noted with increasing monomer concentration in the electrolyte soluti on.