1064-nanometer-excited Fourier transform Raman spectroscopy of conducting polymers

Yukio Furukawa, Hitoshi Ohta, Akira Sakamoto, Mitsuo Tasumi

Research output: Contribution to journalArticle

46 Citations (Scopus)

Abstract

Application of 1064-nm-excited Fourier transform (FT)-Raman spectroscopy to the characterization of conducting polymers is described. 1064-nm-excited FT-Raman spectra with high signal-to-noise ratios are obtained from polyacetylene (PA), poly(1,4-phenylene) (PPP), poly(1,4-phenylene vinylene) (PPV) and poly(2,5-thienylene vinylene) (PTV) in their neutral (insulating) state. The resonant Raman spectra of acceptor- or donor-doped (conducting) PA and PPV are also obtained wih 1064-nm excitation. The resonant Raman spectra of Na-doped PA change in two stages with increasing dopant concentration, the first change corresponding to the increase in electrical conductivity and the second to the appearance of a Pauli susceptibility. The 1064-nm-excited FT-Raman spectrum of Na-doped PPV indicates existence of negative bipolarons which are equivalent to divalent anions extending over a few repeating units in the polymer chains.

Original languageEnglish
Pages (from-to)1367-1373
Number of pages7
JournalSpectrochimica Acta Part A: Molecular Spectroscopy
Volume47
Issue number9-10
DOIs
Publication statusPublished - 1991
Externally publishedYes

ASJC Scopus subject areas

  • Engineering(all)

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