Journal
ELECTROCHIMICA ACTA
Volume 52, Issue 2, Pages 728-735Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.electacta.2006.05.061
Keywords
polyaniline; SPANI; Raman spectroscopy; UV-vis-near IR spectroscopy; polarons; cycling
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Partially sulfonated polyaniline (SPANI) prepared by electropolymerization was studied using Raman spectroscopy (RS). The sulfonated substituent is known to induce a self-doping phenomenon, which allows conduction in SPANI in a larger pH range than in PANI. RS allows, to describe and discuss the modifications related to self-doping. It is shown that the charges organization (polaron lattice or bipolaron) on the chain is modified. Self-doping has an effect upon the rings nature, which presents a more oxidized character. The main SPANI characteristics: mean conductivity and high effect of protection against corrosion are explained, thanks to Raman results. (c) 2006 Elsevier Ltd. All rights reserved.
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