Charge transport in the "emeraldine" form of polyaniline

H. H.S. Javadi, F. Zuo, K. R. Cromack, M. Angelopoulos, A. G. MacDiarmid, A. J. Epstein

Research output: Contribution to journalArticlepeer-review

53 Scopus citations


The conductivity and the dielectric constant of the "emeraldine" form of polyaniline is studied in a wide range of frequency (dc, 101-105 Hz, 6.5×109 Hz), temperature (20K-340K) and protonation level (x ≡[C1]/[N] =0.0-0.5). Two distinct behaviors are observed: Firstly, for low protonation (x ≤ 0.13), hopping of charges between polarons and bipolarons leads to dipolar relaxation (ε{lunate}RF(T)). Oscillation of polarons around pinning centers is suggested to be responsible for the high frequency dielectric constant of low protonated samples. Secondly, for intermediate to highly protonated samples (x > 0.22), the presence of "metallic islands" is apparent. Oscillation of charge carriers within the coherence length contributes to ε{lunate}μω(T=0). The intrinsic conductivity within the islands is estimated to be of the order of 250 S/cm. The T-dependence of the dielectric constant indicates an increase of the coherence length with increasing temperature. The role of localization and the nature of "textured metallic islands" are discussed.

Original languageEnglish (US)
Pages (from-to)409-416
Number of pages8
JournalSynthetic Metals
Issue number1
StatePublished - Mar 7 1989
Externally publishedYes

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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