Inhomogeneous disorder and the modified Drude metallic state of conducting polymers

A. J. Epstein, J. Joo, R. S. Kohlman, G. Du, A. G. MacDiarmid, E. J. Oh, Y. Min, J. Tsukamoto, H. Kaneko, J. P. Pouget

Research output: Contribution to journalArticlepeer-review

130 Citations (Scopus)


The metallic state of the very highly conducting doped polymers, such as polyacetylene, polypyrrole and polyaniline, is shown to have remarkable similarities. Though each of these doped polymers has a different temperature-dependent conductivity, each of these doped polymer systems has a similar metal-like Pauli susceptibility and density of states at the Fermi level. Also, each of these highly conducting systems displays a universal electronic response (dielectric constant and conductivity) as a function of frequency from the microwave regime (109 Hz) through to the 'all conduction electron plasma frequency' (1 to 3 eV, depending on the polymer). This common behavior despite apparent differences in the temperature-dependent conductivities is proposed to be a consequence of the inhomogeneous crystalline order in these materials, leading to three-dimensional metallic domains or islands (crystallographically coherent regions), separated by poorly conducting weak links (disordered regions and interfiber links).

Original languageEnglish
Pages (from-to)149-157
Number of pages9
JournalSynthetic Metals
Issue number2-3
Publication statusPublished - 1994 Aug
Externally publishedYes

Bibliographical note

Funding Information:
The authors gratefully acknowledge stimulating discussions with V.N. Prigodin. This work was supported in part by ONR Grant No. N00014-92-J1369, NSF INT. Grant No. 90-16586, an International Joint Research Project from The New Energy and Industrial Technology Development Organization (NEDO-Japan), and an 'Action Incitative CNRS-NSF'.


  • Dielectric constant
  • Disorder
  • Drude metallic state

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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