Accession Number:

ADA199258

Title:

Potential Dependence of the conductivity of Poly(3-Methylthiophene) in Liquid So2/Electrolyte: A Finite Potential Window of High Conductivity

Descriptive Note:

Interim technical rept.

Corporate Author:

MASSACHUSETTS INST OF TECH CAMBRIDGE DEPT OF CHEMISTRY

Personal Author(s):

Report Date:

1988-08-15

Pagination or Media Count:

15.0

Abstract:

Poly3-methylthiophene, I, on Platinum microelectrodes shows reversible oxidation in liquid sulfideelectrolyte, and accompanying oxidation of I are large changes in its conductivity. By using liquid SO20.1 M n-Bu 4Npf6 as the solventelectrolyte system it is possible to study the conductivity vs. potential for very positive potentials, to approx. 2.5 V vs. Ag. Over the large potential range explored, I has a broad maximum in conductivity at approx. 0.9 V vs. Ag, and a more positive excursion results in substantially lower conductivity. The width of the region of high conductivity is approx. 1.3 V, substantially wider than that for polyaniline. Results for polythiophene II, in SO20.1 M n-Bu4Npf6 are similar to those for I. Results for I and II show that it is possible to sufficiently depopulate the highest occupied electronic bands of I and II to render them nonconducting, as suggested by theory. Thiophenes.

Subject Categories:

  • Inorganic Chemistry
  • Organic Chemistry

Distribution Statement:

APPROVED FOR PUBLIC RELEASE