Polyaniline: a new concept in conducting polymers

The analytically pure base form of polyaniline, ▪, corresponding to the emeraldine oxidation state is converted from an insulator (σ ▪ 10 −10S/cm) to a metal (σ ▪ 5 S/cm) by treatment with ▪ 1M aqueous HCl to form the corresponding salt, emeraldine hydrochloride, ▪. This involves a new type of dopin...

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Bibliographic Details
Published in:Synthetic metals 1987-02, Vol.18 (1), p.285-290
Main Authors: Macdiarmid, A.G., Chiang, J.C., Richter, A.F., Epstein, A.J.
Format: Article
Language:English
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Summary:The analytically pure base form of polyaniline, ▪, corresponding to the emeraldine oxidation state is converted from an insulator (σ ▪ 10 −10S/cm) to a metal (σ ▪ 5 S/cm) by treatment with ▪ 1M aqueous HCl to form the corresponding salt, emeraldine hydrochloride, ▪. This involves a new type of doping of a conducting polymer in that the number of electrons associated with the polymer undergoes no change during the protonic acid doping process. The metallic emeraldine hydrochloride is believed to be a delocalized poly(semiquinone radical cation) having a polaron conduction band, with most of the positive charge residing on the nitrogen atoms. It exhibits a finite density of states at the Fermi energy.
ISSN:0379-6779
1879-3290
DOI:10.1016/0379-6779(87)90893-9