Accession Number:

ADA242443

Title:

Molecular and Electronic Structure of Thin Films of Protoporphyrin(IX)Fe(III)C1

Descriptive Note:

Technical rept. no. 1 for period ending 1 Jan 1991

Corporate Author:

MINNESOTA UNIV MINNEAPOLIS DEPT OF CHEMICAL ENGINEERING AND MATERIALS SCIENCE

Personal Author(s):

Report Date:

1991-11-10

Pagination or Media Count:

46.0

Abstract:

Electrochemical, scanning tunneling microscopy STM, and tunneling spectroscopy studies of the molecular and electronic properties of thin films of protoporphyrinIXFeIIICl abbreviated as PPIXFeIIICl on highly oriented pyrolytic graphite HOPG electrodes are reported. PPIXFeIIICl films are prepared by two different methods 1 adsorption, yielding an electrochemically-active film, and 2 irreversible electrooxidative polymerization, yielding an electrochemically-inactive film. STM images, in conjunction with electro-chemical results, indicate that adsorption of PPIX feIIICl from aqueous solutions onto freshly cleaved HOPG results in a film comprised of molecular aggregates. In contrast, films prepared by irreversible electrooxidative polymerization of PPIXFeIIICl have a denser, highly structured morphology, including what appear to be small pinholes approx. 50A diameter in an otherwise continuous film.

Subject Categories:

  • Electricity and Magnetism

Distribution Statement:

APPROVED FOR PUBLIC RELEASE