Simple synthesis of water-soluble conducting polyaniline

Shoji Ito, Kazuhiko Murata*, Seiichi Teshima, Ryuji Aizawa, Yoshinobu Asako, Kohshin Takahashi, Brian M Hoffman

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

100 Scopus citations


A water-soluble externally (HCl)-doped conducting polyaniline (ED-SPAN) is prepared by such a simple synthetic method that emeraldine salts are sulfonated by chlorosulfonic acid in dichloroethane at 80°C and subsequently hydrated in water at 100°C. Sulfonating any emeraldine salts (counter anion X- = Cl-, SO42-, and BF4-) or emeraldine base results in the production of HCl-doped sulfonated polyaniline, where HCl dopant from hydrolysis of chlorosulfonic group exchanges with the original dopant. The degree of sulfonation, namely, sulfur-to-nitrogen (S/N) ratio, can be controlled by adjusting the amount of chlorosulfonic acid. With increasing S/N ratio from 0.65 to 1.3, the solubility in neutral water increases from 22 to 88 g/I and the four-probe conductivity for a compressed pellet decreases from 0.023 to 1.7 × 10-5 S/cm, showing sulfonation-induced undoping.

Original languageEnglish (US)
Pages (from-to)161-163
Number of pages3
JournalSynthetic Metals
Issue number2
StatePublished - Jul 30 1998


  • Polyaniline
  • Synthesis

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering
  • Metals and Alloys
  • Materials Chemistry


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