Accession Number:

ADA222739

Title:

Electrochemical, In Situ Raman Spectroscopic, and Conductivity Studies of Polypyrrole Incorporating Large Size Anions: Conducting Nature of Reduced Form

Descriptive Note:

Technical rept. Dec 1989-Nov 1990,

Corporate Author:

JACKSON STATE UNIV MS DEPT OF CHEMISTRY

Report Date:

1990-05-21

Pagination or Media Count:

50.0

Abstract:

Polypyrrole PPY thin films doped with large size anions, such as tetrasulfonated metallophthalocyanines, tetrasulfornated copper porphyrin, polyvinyl sulfate, and polyP-styrenesulfonate, have shown electrochemical activities of redox pairs in both aqueous and nonaqueous solutions at the negative potentials where the PPY is reduced to a neutral form. In situ Raman spectroscopy showed that the charge-transfer reactions of redox pairs took place at the surface of the reduced PPY thin films in the negative potential range. Cyclic voltammetric results indicated that the structurally rigid PPY films which were doped with large size anions demonstrated a considerable electrochemical conductivity when the PPY was reduced to a neutral form, although both ex situ and in situ conductivity measurements of these films indicated that the electronic conductivity of the reduced form is generally several orders of magnitude smaller than that of the oxidized form. JG

Subject Categories:

  • Polymer Chemistry
  • Atomic and Molecular Physics and Spectroscopy

Distribution Statement:

APPROVED FOR PUBLIC RELEASE