UPS studies of conducting polymers: Dopant effect on conjugated polymer systems sensitive to conductivity

Susumu Takemura, Yasuhisa Kitagawa, Hitoshi Kato, Yasushi Nakajima

Research output: Contribution to journalArticle

3 Citations (Scopus)

Abstract

The valence bands of polypyrrole doped with various types of dopant have been investigated in order to clarify the polymer configurations associated with lattice distortion due to the dopants. Ultraviolet photoemission spectroscopy (UPS) spectra of doped and reduced polypyrrole exhibits two characteristic shoulders theoretically assigned to 2b 1 and 1a 2 π-orbitals. Increase of the density of states (DOS) at the 2b 1 level and decrease of the DOS at 1a 2 observed in the doped state indicate that doping affects the 2b 1 valence band related with π-orbitals of the N atom, which suggests the lattice distorted structure of the conjugated polymer system. Valence bands of samples doped with cyclic and polycyclic compounds give different spectrum profiles due to the π-electron systems.

Original languageEnglish
Pages (from-to)107-111
Number of pages5
JournalApplied Surface Science
Volume100-101
DOIs
Publication statusPublished - 1996 Jul

ASJC Scopus subject areas

  • Chemistry(all)
  • Condensed Matter Physics
  • Physics and Astronomy(all)
  • Surfaces and Interfaces
  • Surfaces, Coatings and Films

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