Vibrational key bands and electrical conductivity of polythiophene

Yukio Furukawa, M. Akimoto, I. Harada

Research output: Contribution to journalArticle

310 Citations (Scopus)

Abstract

Infrared and Raman spectra of neutral polythiophene were analyzed on the basis of the data of oligomers (α-bithiophene, α-terthiophene, α-quaterthiophene, and α-sexithiophene) and deuterated and 2,5-13C-substituted polythiophenes. Vibrational assignments were confirmed including those of key bands useful in deriving the degree of polymerization (Ndp), the average number of s-trans conjugated successive rings (Nc), and the amount of distorted part (kink) relative to that of conjugated part (Ak). It is possible to estimate Ndp, Nc, and Ak from the vibrational spectra of a neutral film. Among ten films prepared under different conditions, the one which showed the highest electrical conductivity (2.0×102 Scm-1) on maximum iodine doping exhibited the largest Nc (>6) and the smallest Ak but an intermediate (5th) Ndp (20). The film with the largest Ndp (35) happened to show Nc smaller and Ak larger than those of the above-mentioned film and the conductivity was 5.0×10 Scm-1. Hence, a small number of kinks (i.e., abundance of long conjugated segments) is indispensable for a polymer film to gain high electrical conductivity at the doped state.

Original languageEnglish
Pages (from-to)151-156
Number of pages6
JournalSynthetic Metals
Volume18
Issue number1-3
DOIs
Publication statusPublished - 1987
Externally publishedYes

Fingerprint

conductivity
electrical resistivity
Polymers
Vibrational spectra
Iodine
Oligomers
Polymer films
Raman scattering
high gain
oligomers
vibrational spectra
Polymerization
Doping (additives)
iodine
Infrared radiation
infrared spectra
polymerization
Electric Conductivity
polythiophene
Raman spectra

ASJC Scopus subject areas

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

Cite this

Vibrational key bands and electrical conductivity of polythiophene. / Furukawa, Yukio; Akimoto, M.; Harada, I.

In: Synthetic Metals, Vol. 18, No. 1-3, 1987, p. 151-156.

Research output: Contribution to journalArticle

Furukawa, Yukio ; Akimoto, M. ; Harada, I. / Vibrational key bands and electrical conductivity of polythiophene. In: Synthetic Metals. 1987 ; Vol. 18, No. 1-3. pp. 151-156.
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