Journal
JOURNAL OF ELECTROANALYTICAL CHEMISTRY
Volume 518, Issue 1, Pages 13-19Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/S0022-0728(01)00689-1
Keywords
polyaniline; mobility; oxidation; Polaron; spins
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The mobilities of positive charge carriers in polyaniline films measured as a function of oxidation level are discussed with the help of in-situ ESR measurements. Three different processes are found to occur over oxidation levels ranging from 0.1 to 43%. An initial decrease of mobility is followed by a small hump at oxidation levels up to 7%. This mobility change is ascribed to a change in conformation from coil to expanded coil. which is supported by optical absorption spectra. The rise in mobility from an oxidation window of 7 to 36% can be interpreted well in the framework of a polaron lattice model. ESR data provide strong evidence for the transformation between Curie and Pauli spins. The decrease in the mobility above the 36% oxidation level is accounted for in terms of a transition from the emeraldine salt to the base form. (C) 2002 Published by Elsevier Science B.V.
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