Polyaniline, a novel conducting polymer. Morphology and chemistry of its oxidation and reduction in aqueous electrolytes

Wu Song Huang, Brian Humphrey, Alan G. MacDiarmid

Research output: Contribution to journalArticle

1656 Citations (Scopus)

Abstract

The emeraldine salt form of polyaniline, conducting in the metallic regime, can be synthesized electrochemically as a film exhibiting a well defined fibrillar morphology closely resembling that of polyacetylene. Cyclic voltammograms of chemically synthesized and electrochemically synthesized polyaniline are essentially identical. Probable chemical changes which occur and the compounds which are formed when chemically synthesized poly-aniline is electrochemically oxidized and reduced between -0.2 and 1.0 V vs. SCE in aqueous HCl solutions at pH values ranging from -2.12 (6.0 mol dm-3) to 4.0 have been deduced from cyclic voltametric studies. These are shown to be consistent with previous chemical and conductivity studies of emeraldine base and emeraldine salt forms of polyaniline. It is proposed that the emeraldine salt form of polyaniline has a symmetrical conjugated structure having extensive charge delocalization resulting from a new type of doping of an organic polymer-salt formation rather than oxidation which occurs in the p-doping of all other conducting polymer systems.

Original languageEnglish
Pages (from-to)2385-2400
Number of pages16
JournalJournal of the Chemical Society, Faraday Transactions 1: Physical Chemistry in Condensed Phases
Volume82
Issue number8
DOIs
StatePublished - 1 Jan 1986

Fingerprint

Conducting polymers
Electrolytes
Salts
Oxidation
Polyacetylenes
Doping (additives)
Organic polymers
polyaniline

Cite this

@article{97e6bdc14c444785ae3fdc10652b4880,
title = "Polyaniline, a novel conducting polymer. Morphology and chemistry of its oxidation and reduction in aqueous electrolytes",
abstract = "The emeraldine salt form of polyaniline, conducting in the metallic regime, can be synthesized electrochemically as a film exhibiting a well defined fibrillar morphology closely resembling that of polyacetylene. Cyclic voltammograms of chemically synthesized and electrochemically synthesized polyaniline are essentially identical. Probable chemical changes which occur and the compounds which are formed when chemically synthesized poly-aniline is electrochemically oxidized and reduced between -0.2 and 1.0 V vs. SCE in aqueous HCl solutions at pH values ranging from -2.12 (6.0 mol dm-3) to 4.0 have been deduced from cyclic voltametric studies. These are shown to be consistent with previous chemical and conductivity studies of emeraldine base and emeraldine salt forms of polyaniline. It is proposed that the emeraldine salt form of polyaniline has a symmetrical conjugated structure having extensive charge delocalization resulting from a new type of doping of an organic polymer-salt formation rather than oxidation which occurs in the p-doping of all other conducting polymer systems.",
author = "Huang, {Wu Song} and Brian Humphrey and MacDiarmid, {Alan G.}",
year = "1986",
month = "1",
day = "1",
doi = "10.1039/F19868202385",
language = "English",
volume = "82",
pages = "2385--2400",
journal = "Journal of the Chemical Society, Faraday Transactions 1: Physical Chemistry in Condensed Phases",
issn = "0300-9599",
publisher = "Faraday Division of the Chemical Society",
number = "8",

}

TY - JOUR

T1 - Polyaniline, a novel conducting polymer. Morphology and chemistry of its oxidation and reduction in aqueous electrolytes

AU - Huang, Wu Song

AU - Humphrey, Brian

AU - MacDiarmid, Alan G.

PY - 1986/1/1

Y1 - 1986/1/1

N2 - The emeraldine salt form of polyaniline, conducting in the metallic regime, can be synthesized electrochemically as a film exhibiting a well defined fibrillar morphology closely resembling that of polyacetylene. Cyclic voltammograms of chemically synthesized and electrochemically synthesized polyaniline are essentially identical. Probable chemical changes which occur and the compounds which are formed when chemically synthesized poly-aniline is electrochemically oxidized and reduced between -0.2 and 1.0 V vs. SCE in aqueous HCl solutions at pH values ranging from -2.12 (6.0 mol dm-3) to 4.0 have been deduced from cyclic voltametric studies. These are shown to be consistent with previous chemical and conductivity studies of emeraldine base and emeraldine salt forms of polyaniline. It is proposed that the emeraldine salt form of polyaniline has a symmetrical conjugated structure having extensive charge delocalization resulting from a new type of doping of an organic polymer-salt formation rather than oxidation which occurs in the p-doping of all other conducting polymer systems.

AB - The emeraldine salt form of polyaniline, conducting in the metallic regime, can be synthesized electrochemically as a film exhibiting a well defined fibrillar morphology closely resembling that of polyacetylene. Cyclic voltammograms of chemically synthesized and electrochemically synthesized polyaniline are essentially identical. Probable chemical changes which occur and the compounds which are formed when chemically synthesized poly-aniline is electrochemically oxidized and reduced between -0.2 and 1.0 V vs. SCE in aqueous HCl solutions at pH values ranging from -2.12 (6.0 mol dm-3) to 4.0 have been deduced from cyclic voltametric studies. These are shown to be consistent with previous chemical and conductivity studies of emeraldine base and emeraldine salt forms of polyaniline. It is proposed that the emeraldine salt form of polyaniline has a symmetrical conjugated structure having extensive charge delocalization resulting from a new type of doping of an organic polymer-salt formation rather than oxidation which occurs in the p-doping of all other conducting polymer systems.

UR - http://www.scopus.com/inward/record.url?scp=0006493749&partnerID=8YFLogxK

U2 - 10.1039/F19868202385

DO - 10.1039/F19868202385

M3 - Article

AN - SCOPUS:0006493749

VL - 82

SP - 2385

EP - 2400

JO - Journal of the Chemical Society, Faraday Transactions 1: Physical Chemistry in Condensed Phases

JF - Journal of the Chemical Society, Faraday Transactions 1: Physical Chemistry in Condensed Phases

SN - 0300-9599

IS - 8

ER -