Platinum-induced morphology and reactivity changes on W(111)
- Department of Physics and Astronomy and Laboratory for Surface Modification, Rutgers, The State University of New Jersey, Piscataway, New Jersey 08855-0849 (United States)
The structure and CO chemisorption properties of a model bimetallic system Pt on W(111) have been studied using Auger electron spectroscopy (AES), low energy electron diffraction (LEED), scanning tunneling microscopy (STM), and thermal desorption spectroscopy (TDS). The results reveal that upon annealing, the Pt/W(111) system undergoes a variety of structural transformations, with the most striking being the reconstruction of the W(111) substrate to form pyramidal facets with [l brace]211[r brace] orientations. The presence or absence of facets, and size distribution of the facets, are sensitive functions of Pt coverage and annealing temperature. LEED results for faceted surfaces annealed to different temperatures correlate well with the STM data. CO has been used as a probe molecule to examine the chemisorption properties of the different structural phases. Increasing Pt coverage causes site blocking that results in reduced dissociative adsorption of CO.
- OSTI ID:
- 5995391
- Journal Information:
- Journal of Chemical Physics; (United States), Journal Name: Journal of Chemical Physics; (United States) Vol. 99:11; ISSN JCPSA6; ISSN 0021-9606
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
360102* -- Metals & Alloys-- Structure & Phase Studies
ANNEALING
AUGER ELECTRON SPECTROSCOPY
CARBON COMPOUNDS
CARBON MONOXIDE
CARBON OXIDES
CHALCOGENIDES
CHEMICAL REACTIONS
CHEMISORPTION
COHERENT SCATTERING
CRYSTAL-PHASE TRANSFORMATIONS
DIFFRACTION
DISSOCIATION
ELECTRON DIFFRACTION
ELECTRON SPECTROSCOPY
ELEMENTS
HEAT TREATMENTS
METALS
MICROSCOPY
MORPHOLOGY
OXIDES
OXYGEN COMPOUNDS
PHASE TRANSFORMATIONS
PLATINUM
PLATINUM METALS
SCATTERING
SEPARATION PROCESSES
SORPTION
SPECTROSCOPY
TRANSITION ELEMENTS
TUNGSTEN