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Interaction of oxygen with Al(111) at elevated temperatures

J. Chem. Phys. 108, 1740 (1998); doi:10.1063/1.475546

Issue Date: 22 January 1998

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J. Trost, H. Brune, J. Wintterlin, R. J. Behm, and G. Ertl
Fritz-Haber-Institut der Max-Planck-Gesellschaft, Faradayweg 4-6, 14195 Berlin, Germany
The interaction of oxygen with Al(111) was investigated by STM at temperatures between 350 and 530 K, by annealing an oxygen precovered surface and by adsorption of oxygen on the hot surface. For exposures up to 10 L and temperatures up to 470 K a considerable part of the oxygen exists still in the chemisorbed state, another part transforms into Al oxide. In contrast to 300 K chemisorbed Oad atoms are mobile at elevated temperatures, and compact, hexagonal (1 × 1)Oad islands develop by an ordinary nucleation and growth scheme. This evidences attractive interactions between the oxygen atoms on (1 × 1) sites. From the lateral distribution of Oad islands a diffusion barrier of 1.0–1.1 eV is derived. The imaging of the islands of the (1 × 1) phase by STM depends on their size, which is understood by a different imaging of the Oad/Al adsorbate complexes at the island borders. Defects in the islands and bright features at the edges are interpreted as nuclei of aluminum oxide. Additional features which appear as topographic holes may be attributed to nonconducting Al oxide grains. ©1998 American Institute of Physics.
History: Received 10 July 1997; accepted 15 October 1997
Permalink: http://link.aip.org/link/?JCPSA6/108/1740/1
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KEYWORDS and PACS

Keywords
PACS
  • 68.45.-v
    Surfaces and interfaces; thin films and whiskers (structure and nonelectronic properties) Solidfluid interfaces
  • 82.65.My
    Physical chemistry Surface and interface chemistry Chemisorption
  • 82.65.-i
    Physical chemistry Surface and interface chemistry
  • 61.50.-f
    Structure of solids and liquids; crystallography Crystalline state
  • YEAR: 1998

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ISSN:
0021-9606 (print)   1089-7690 (online)
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