Potential Dependence of the conductivity of Poly(3-Methylthiophene) in Liquid So2/Electrolyte: A Finite Potential Window of High Conductivity
Abstract
Poly(3-methylthiophene), I, on Platinum microelectrodes shows reversible oxidation in liquid sulfide/electrolyte, and accompanying oxidation of I are large changes in its conductivity. By using liquid SO2/0.1 M (n-Bu) 4Npf6 as the solvent/electrolyte 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 SO2/0.1 M (n-Bu)4Npf6 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.
Document Details
- Document Type
- Technical Report
- Publication Date
- Aug 15, 1988
- Accession Number
- ADA199258
Entities
People
- David Ofer
- Mark S. Wrighton
Organizations
- Massachusetts Institute of Technology