Charge transport in conducting polymers: Polyacetylene nanofibres

A. B. Kaiser, S. A. Rogers, Y. W. Park

Research output: Contribution to journalArticlepeer-review

Abstract

The preparation of individual polyacetylene nanofibres has allowed a more probing investigation of the properties of polyacetylene. A significant discovery is that at low temperatures, polyacetylene nanofibres show temperature-independent Zener-type tunnelling, that we suggest is tunnelling of the conjugated-bond pattern along single polyacetylene chains. At higher temperatures, the current shows a strong increase with temperature and the nonlinearity of the current-voltage characteristics decreases. We make a comparison with similar behaviour found in single-wall carbon nanotube networks, and show that the decrease in nonlinearity is consistent with our generic calculations for fluctuation-assisted tunnelling and thermal excitation. There is no evidence for superconductivity in resistance measurements on polyacetylene. The thermoelectric power of polyacetylene and other bulk organic conducting polymers indicates the absence of significant superconductivity arising from the conventional electron-phonon mechanism.

Original languageEnglish (US)
Pages (from-to)115-124
Number of pages10
JournalMolecular crystals and liquid crystals
Volume415
DOIs
StatePublished - 2004
Externally publishedYes

Keywords

  • Current-voltage characteristics
  • Nanofibres
  • Polyacetylene
  • Superconductivity

ASJC Scopus subject areas

  • Chemistry(all)
  • Materials Science(all)
  • Condensed Matter Physics

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