Polyaniline: a new concept in conducting polymers

作者：Alan Graham MacDiarmid, Jin-Chih Chiang, A.F. Richter, A. J. Epstein · 发表于：Synthetic Metals · 年份：1987 · DOI：10.1016/0379-6779(87)90893-9 · 被引用次数：1423 · 研究领域：Conducting polymers and applications、Electrochemical sensors and biosensors、Analytical Chemistry and Sensors

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.