Influence of Compositional Heterogeneity on the Chemisorption and Reactivity of Small Molecules on Copper/Copper Silicide Surfaces

Lawrence H. Dubois, Ralph G. Nuzzo

Research output: Contribution to journalArticlepeer-review

Abstract

This study examined the chemisorption of CO on Cu(100) in the presence of ordered, copper silicide islands. Results show an important role for surface diffusion and domain heterogeneity in this system. It is found that, even though CO does not dissociate on either clean Cu(100) or on a uniform silicide overlayer, island morphologies result in a facile dissociation reaction. It is shown that this arises from the selective adsorption of molecular CO on the exposed copper substrate (CuSi//x does not bind CO under these conditions) followed by diffusion to the edges of islands where dissociation can and does occur. This simple model is used to explain results for O//2, CO//2, CH//3OH, and H//2O chemisorption as well.

Original languageEnglish (US)
Pages (from-to)663-669
Number of pages7
JournalLangmuir
Volume1
Issue number6
DOIs
StatePublished - Nov 1985
Externally publishedYes

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Surfaces and Interfaces
  • Spectroscopy
  • Electrochemistry

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