INHOMOGENEOUS CHARGE-TRANSPORT IN CONDUCTING POLYANILINE

We report charge transport studies of two composite systems, CSA-doped polyaniline (CSA-PAN) in Nylon-12 blends and TSA-PAN coated carbon bl acks (CB). The CSA-PAN/Nylon samples showed a temperature dependent in sulator-metal transition and an anomalous high microwave absorption wh ile the TSA-PAN/CB samples showed an unusual insulator to metal transi tion from the individual materials to the composites. We propose that the common scheme in these results is the inhomogeneous charge transpo rt due to the formation of ordered regions (''metallic islands'') duri ng the polymerization of conducting polyaniline in both composites.