Electrochemical oxidation of pyrrole has been undertaken in aqueous suspensions of metal oxides in the presence and absence of hydroxides. It has been found that polypyrrole films containing oxide particles can be prepared for oxides having the isoelectric point smaller than pH ca. 4.5 provided that pH of the oxide suspensions is high enough to build up negative charges on the oxide surfaces.
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Yoneyama et al. (1989) studied this question.
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