Accession Number : ADA328459

Title :   Spectroscopic, Voltammetric, and Electrochemical Scanning Tunneling Microscopic Study of Underpotentially Deposited Cu Corrosion and Passivation with Self-Assembled Organomercaptan Monolayers.

Descriptive Note : Technical rept. 1 Jun-31 Jul 96,

Corporate Author : TEXAS A AND M UNIV COLLEGE STATION DEPT OF CHEMISTRY

Personal Author(s) : Zamborini, Francis P. ; Campbell, Joseph K. ; Crooks, Richard M.

PDF Url : ADA328459

Report Date : 31 JUL 1997

Pagination or Media Count : 38

Abstract : FTIR-external reflectance spectroscopy (FTIR-ERS), x-ray photoelectron spectroscopy (XPS), electrochemistry, and electrochemical scanning tunneling microscopy (ECSTM) were used to study the effect of thiol adsorbates on the oxidation of underpotentially deposited Cu on Au (Au/Cu-UPD) in HC1O(4)-containing electrolyte solutions. The morphology of the corroding Cu layer and its stripping potential are influenced by the presence of the thiol monolayers. Hexadecanethiol prevented corrosion of Cu-UPD up to potentials more than 1200 mV positive of its oxidation potential on unpassivated electrodes. 4-hydroxythiophenol and pentanethiol also shift the oxidation potential but to a lesser degree. These findings raise the possibility for new strategies to prevent corrosion using very thin, easily prepared composite films.

Descriptors :   *CORROSION, *COPPER, *THIOLS, SCANNING ELECTRON MICROSCOPES, SPECTROSCOPY, LAYERS, COMPOSITE MATERIALS, TUNNELING(ELECTRONICS), ELECTRONIC SCANNERS, THIN FILMS, ELECTROCHEMISTRY, ELECTRON MICROSCOPY, OXIDATION, X RAY PHOTOELECTRON SPECTROSCOPY, ELECTRODES, ORGANIC COMPOUNDS, ELECTROLYTES, GOLD, VOLTAMMETRY, INORGANIC COMPOUNDS, PASSIVITY, ADSORBATES.

Subject Categories : Inorganic Chemistry
      Organic Chemistry
      Atomic and Molecular Physics and Spectroscopy
      Physical Chemistry

Distribution Statement : APPROVED FOR PUBLIC RELEASE