SURFACE RESTRUCTURING OF W(111) INDUCED BY SULFUR OVERLAYERS

C.-H. Nien, I. M. Abdelrehim and T. E. Madey ()
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C.-H. Nien: Department of Physics and Astronomy, and Laboratory for Surface Modification, Rutgers, The State University of New Jersey, Piscataway, NJ 08854-8019, USA
I. M. Abdelrehim: Department of Physics and Astronomy, and Laboratory for Surface Modification, Rutgers, The State University of New Jersey, Piscataway, NJ 08854-8019, USA
T. E. Madey: Department of Physics and Astronomy, and Laboratory for Surface Modification, Rutgers, The State University of New Jersey, Piscataway, NJ 08854-8019, USA

Surface Review and Letters (SRL), 1999, vol. 06, issue 01, 77-96

Abstract: The restructuring of S/W(111) surfaces has been studied using low-energy electron diffraction (LEED), Auger electron spectroscopy (AES) and scanning tunneling microscopy (STM). Dosing W(111) with a saturation coverage ofH2Sfollowed by annealing to>800K causes the substrate to reconstruct, forming a structure with(4× 4)periodicity. In addition, the terrace-step configurations restructure and form triangular domains with a preferential orientation. These domains coalesce and enlarge, and also form multiple steps when the surface is heated toT>1000K. The low reactivity of sulfided W(111) to high exposures of oxygen demonstrates that the surface is passivated by sulfur. Adsorption of S onto a faceted Pd/W(111) surface causes the facets to disappear, restoring the surface's planar form upon annealing. The resulting features are dominated by a(2× 2)structure. A size-mismatch mechanism, based on charge transfer between S/W and coadsorbed Pd/S on W, has been proposed to explain the formation of(4× 4)and(2× 2)structures, as well as the transition between these structures.

Date: 1999
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DOI: 10.1142/S0218625X9900010X

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