We report ellipsometric measurements on films of polyaniline grown galvanostatically on platinum electrodes in HCl solutions. The films were characterized optically in situ and under potential control. They were also studied while undergoing electrochemical conversion between the bleached (insulating) and colored (conducting) forms induced by an applied bias. We show that ellipsometry is capable of providing unique information on the details of the electrochemical film conversion process. We also show that these films present strong similarities in both ellipsometric and voltammetric behavior with hydrous oxide films undergoing similar voltage-driven color-bleach cycles.
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Redondo et al. (1988) studied this question.
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