Correlation between vibrational spectra and electrical conductivity of polythiophene

M. Akimoto, Yukio Furukawa, H. Takeuchi, I. Harada, Y. Soma, M. Soma

Research output: Contribution to journalArticle

132 Citations (Scopus)

Abstract

Polythiophene films synthesized by electrochemical polymerization under various conditions were undoped and redoped maximally with iodine. The electrical conductivity of the redoped films was in the range 2 × 102 - 5.9 S cm-1. Vibrational spectra of the undoped films were analysed on the basis of those of model compounds including 2,2′-bithiophene, 2,2′:5′,2″-terthiophene and 2,2′:5′,2″:5″,2′-quaterthiophene. First, the intensity ratio of the infrared CH out-of-plane bending bands at 697 (2-substituted thiophene) and 787 cm-1 (2,5-substituted thiophene) is a clue to the degree of polymerization. Secondly, the intensity ratio of the infrared double-bond symmetric and antisymmetric stretching bands reflects the distribution in length of the conjugated segment. Finally, the intensities of three Raman bands at 1155, 682 and 652 cm-1 give information about the amount of distorted structure around the inter-ring C-C bonds. From the comparison of the spectroscopic and conductivity data, it is concluded that a high degree of polymerization alone is not adequate for a doped film to have high electrical conductivity but abundance of long conjugated coplanar segments is the requisite condition.

Original languageEnglish
Pages (from-to)353-360
Number of pages8
JournalSynthetic Metals
Volume15
Issue number4
DOIs
Publication statusPublished - 1986
Externally publishedYes

Fingerprint

Vibrational spectra
vibrational spectra
Thiophenes
conductivity
electrical resistivity
polymerization
Thiophene
Polymers
thiophenes
Polymerization
Infrared radiation
Electropolymerization
Iodine
iodine
Stretching
methylidyne
Electric Conductivity
polythiophene
rings

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Materials Chemistry
  • Polymers and Plastics

Cite this

Correlation between vibrational spectra and electrical conductivity of polythiophene. / Akimoto, M.; Furukawa, Yukio; Takeuchi, H.; Harada, I.; Soma, Y.; Soma, M.

In: Synthetic Metals, Vol. 15, No. 4, 1986, p. 353-360.

Research output: Contribution to journalArticle

Akimoto, M. ; Furukawa, Yukio ; Takeuchi, H. ; Harada, I. ; Soma, Y. ; Soma, M. / Correlation between vibrational spectra and electrical conductivity of polythiophene. In: Synthetic Metals. 1986 ; Vol. 15, No. 4. pp. 353-360.
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