Evolution of the conducting state of polyaniline from localized to mesoscopic metallic to intrinsic metallic regimes

Jinsoo Joo, E. J. Oh, G. Min, A. G. MacDiarmid, A. J. Epstein

Research output: Contribution to journalArticle

67 Citations (Scopus)

Abstract

The results of microwave dielectric constant (ε{lunate}mw) and dc conductivity (σdc) of doped polyaniline (PAN) samples in different charge delocation regimes are reported. With camphor culfonic acid doped PAN prepared in m-cresol solvent (PAN-CSA (m-cresol)) respresenting the most delocalized material, a negative ε{lunate}mw is measured indicating an intrinsic metallic state. The Drude model at low frequency is used to estimate a relatively small plasma frequency ωp {reversed tilde equals} 0.015 eV and an anomalously long scattering time τ {reversed tilde equals} 1.2 × 10-11 s. This τ implies the importance of phonon back scattering for the most delocalized electrons as expected for the open Fermi surface of a highly anisotropic metal. Depending on the crystallinity, there are two different charge localization regimes in PAN samples: uncoupled metallic islands and coupled "mesoscopic" metallic state. The three-dimensional nature of metallic state is demonstrated by the correlation of low temperature dielectric response with the parallel and perpendicular crystalline domain lengths obtained from x-ray data. The charge localization to delocalization transition dependence on the polymer processing will be discussed. We present the temperature dependent nonmetal-metal transition for some preparations of PAN-CSA (m-cresol). The intrinsic conductivity of metallic PAN is estimated to be ∼ 107 S/cm.

Original languageEnglish
Pages (from-to)251-254
Number of pages4
JournalSynthetic Metals
Volume69
Issue number1-3
Publication statusPublished - 1995 Mar 1
Externally publishedYes

Fingerprint

cresols
Polyaniline
conduction
camphor
conductivity
plasma frequencies
scattering
Fermi surfaces
crystallinity
transition metals
Scattering
permittivity
Camphor
low frequencies
Nonmetals
microwaves
preparation
acids
Fermi surface
polymers

ASJC Scopus subject areas

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

Cite this

Evolution of the conducting state of polyaniline from localized to mesoscopic metallic to intrinsic metallic regimes. / Joo, Jinsoo; Oh, E. J.; Min, G.; MacDiarmid, A. G.; Epstein, A. J.

In: Synthetic Metals, Vol. 69, No. 1-3, 01.03.1995, p. 251-254.

Research output: Contribution to journalArticle

Joo, Jinsoo ; Oh, E. J. ; Min, G. ; MacDiarmid, A. G. ; Epstein, A. J. / Evolution of the conducting state of polyaniline from localized to mesoscopic metallic to intrinsic metallic regimes. In: Synthetic Metals. 1995 ; Vol. 69, No. 1-3. pp. 251-254.
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