PREPARATION OF POLYANILINE FILMS DOPED WITH METHYLENE BLUE-BOUND NAFION AND THE ELECTROCHROMIC PROPERTIES OF THE RESULTING FILMS

The preparation of polyaniline films doped with cationic methylene blue has been accomplished by the electro-oxidation of aniline in the presence of dissolved Nafion and methylene blue. The amount of methylene blue in the film could be varied by changing the relative concentration of methylene blue to Nafion in the deposition bath of polyaniline. The incorporation behaviour of methylene blue in polyaniline films is discussed in terms of the electrostatic binding of methylene blue with the sulphonate groups of Nation® in the deposition bath. The resulting films showed electrochemical responses of both polyaniline and methylene blue. © 1990.