Anisotropic electrical conductivity and e.s.r. spectra of a whisker prepared by electrolysis of 3,3′,5,5′-tetramethylbenzidine

Akira Watanabe, Kunio Mori, Osamu Ito

Research output: Contribution to journalArticle

6 Citations (Scopus)

Abstract

The electrical conductivity of a whisker prepared by electrochemical oxidation of 3,3′,5,5′-tetramethylbenzidine (TMB) was investigated. The TMB whisker showed significant anisotropic conductivity: the conductivity parallel to the long axis of the whisker showed a high value (σ = 1.03 S/cm), whereas the perpendicular one showed a low value (σ = 5.11 × 10-4 S/cm). The cation radical salt of TMB prepared by chemical oxidation with I2 showed low conductivity (σ = 2.57 × 10-4 S/cm) because of the amorphous structure. The association of TMB cation radicals in the whisker was suggested by absorption spectra and e.s.r. spectra of the whisker dissolved in organic solvents. The e.s.r. specturm of a TMB whisker showed anisotropy because of the crystalline structure, whereas the e.s.r. spectrum of the chemical oxidation product was a singlet symmetrical signal which is typical of an amorphous structure. The e.s.r. signal of the whisker showed a rapid intensity drop with decreasing temperature, in comparison with that of the chemical oxidation product.

Original languageEnglish
Pages (from-to)237-244
Number of pages8
JournalSynthetic Metals
Volume32
Issue number2
DOIs
Publication statusPublished - 1989 Oct 13
Externally publishedYes

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering
  • Metals and Alloys
  • Materials Chemistry

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