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Adsorption-induced step formation.

P Thostrup1, E Christoffersen, H T Lorensen

  • 1CAMP, Institute of Physics and Astronomy, University of Aarhus, DK-8000 Aarhus, Denmark.

Physical Review Letters
|October 3, 2001
PubMed
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Carbon monoxide (CO) on platinum surfaces can break platinum-platinum bonds, forming new rough structures. This adsorption-induced step formation is significant at high pressures and temperatures.

Area of Science:

  • Surface Science
  • Materials Science
  • Computational Chemistry

Background:

  • Platinum surfaces are crucial catalysts.
  • Understanding surface restructuring under adsorbate influence is key.
  • Previous studies have not fully characterized CO-induced restructuring on Pt(110).

Purpose of the Study:

  • To investigate the equilibrium structure of CO on the Pt(110) surface.
  • To elucidate the mechanism of CO-induced surface reconstruction.
  • To determine the role of CO binding strength in surface morphology changes.

Main Methods:

  • Density functional theory (DFT) calculations.
  • Monte Carlo (MC) simulations.
  • Scanning tunneling microscopy (STM) experiments.

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Main Results:

  • An intermediate CO coverage induces a rough equilibrium surface structure on Pt(110).
  • CO binds strongly to low-coordinated platinum atoms, breaking Pt-Pt bonds.
  • The formation of surface steps is spontaneously induced by CO adsorption.

Conclusions:

  • Adsorption-induced step formation is a significant phenomenon on Pt(110) due to strong CO binding.
  • This effect may be general for other metal surfaces under specific conditions.
  • High gas pressures and temperatures can promote adsorption-induced restructuring.