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Adsorbate-driven morphological changes on Cu(111) nano-pits.

K Mudiyanselage1, F Xu, F M Hoffmann

  • 1Chemistry Department, Brookhaven National Laboratory, Upton, NY 11973, USA. djs@bnl.gov.

Physical Chemistry Chemical Physics : PCCP
|December 17, 2014
PubMed
Summary
This summary is machine-generated.

Hydrogen adsorption and desorption significantly alter pitted copper surfaces, smoothing them at lower temperatures than vacuum annealing. Carbon monoxide adsorption causes minimal surface morphological changes.

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Area of Science:

  • Surface Science
  • Materials Science
  • Physical Chemistry

Background:

  • Pitted copper (Cu)(111) surfaces exhibit nested hexagonal pits and steep step bundles.
  • Surface roughness can be healed by vacuum annealing at 450-500 K.
  • Adsorbate-surface interactions can induce morphological changes.

Purpose of the Study:

  • To investigate adsorbate-driven morphological changes on pitted Cu(111) surfaces.
  • To compare the effects of carbon monoxide (CO) and hydrogen (H) adsorption and desorption.

Main Methods:

  • Preparation of pitted Cu(111) surfaces via Ar(+) sputtering.
  • Adsorption and desorption studies of CO and H.
  • Infrared spectroscopy (IR) and Scanning Tunneling Microscopy (STM) for surface analysis.

Main Results:

  • CO adsorption on pitted Cu(111) shows IR peaks indicating adsorption on atop and under-coordinated sites; minimal morphological changes observed upon annealing to 300 K.
  • H adsorption on pitted Cu(111), followed by annealing to 300 K, results in a smooth Cu(111) surface.
  • Hydrogen-induced smoothing occurs via sub-surface hydride formation and relaxation, approximately 150 K below vacuum annealing temperatures.

Conclusions:

  • Hydrogen significantly modifies pitted Cu(111) morphology, leading to surface healing at lower temperatures than thermal annealing alone.
  • Carbon monoxide exhibits limited interaction with the Cu(111) surface, resulting in negligible morphological alterations.
  • The formation of sub-surface species is crucial for adsorbate-induced surface restructuring.