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

Abstract

Electrochemical, scanning tunneling microscopy (STM), and tunneling spectroscopy studies of the molecular and electronic properties of thin films of protoporphyrin(IX)Fe(III)Cl (abbreviated as PP(IX)Fe(III)Cl) on highly oriented pyrolytic graphite (HOPG) electrodes are reported. PP(IX)Fe(III)Cl 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 PP(IX) fe(III)Cl from aqueous solutions onto freshly cleaved HOPG results in a film comprised of molecular aggregates. In contrast, films prepared by irreversible electrooxidative polymerization of PP(IX)Fe(III)Cl have a denser, highly structured morphology, including what appear to be small pinholes (approx. 50A diameter) in an otherwise continuous film.

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Document Details

Document Type
Technical Report
Publication Date
Nov 10, 1991
Accession Number
ADA242443

Entities

People

  • Henry S. White
  • Shelly R. Snyder

Organizations

  • University of Minnesota

Tags

Communities of Interest

  • Advanced Electronics
  • Air Platforms

DTIC Thesaurus Topics

  • Chemical Compounds
  • Chemical Engineering
  • Chemical Synthesis
  • Chemistry
  • Dielectric Gases
  • Electrochemical Cells
  • Electrochemistry
  • Electron Transfer
  • Engineering
  • Films
  • Graphitic Materials
  • Materials
  • Materials Laboratories
  • Materials Science
  • Military Research
  • Polymeric Films
  • Thin Films

Fields of Study

  • Chemistry

Readers

  • Electrochemical Engineering/ Fuel Cell Technologies
  • Thin Film Deposition Science.

Technology Areas

  • Microelectronics
  • Microelectronics - Graphene