Adsorption of oxygen on Pt{sub 3}Sn(110) studied by STM and LEED
- Research Institute for Molecules and Materials, Radboud University Nijmegen, 6525 ED Nijmegen (Netherlands)
The adsorption of oxygen on the Pt{sub 3}Sn(110) alloy surface was studied by means of scanning tunneling microscopy (STM) and low-energy electron diffraction (LEED). After exposure to 2300 L O{sub 2} at 750 K LEED shows additional c(2x2) spots with regard to the substrate p(2x1) pattern. This agrees straightforward with STM topographies revealing a thin layer of large protrusions, arranged in a pseudohexagonal lattice. This layer is split into domains separated by distinctive zigzagging boundaries. Post-annealing allowed to partially uncover substrate regions. That way it could be shown that the protrusions are located above Sn locations. Further post-annealing restored the original substrate completely. A model of the adlayer structure consistent with all STM and LEED findings is given. These features observed after high temperature oxygen exposure of the Pt{sub 3}Sn(110) surface resemble to a large extent structures obtained on the Pt{sub 3}Sn(111) surface under similar conditions. The observed structures can be understood in terms of Sn-O entities interacting with each other. However, results from the oxidation of Pt{sub 3}Sn(111) indicate the formation of a Sn layer with chemisorbed oxygen on top, but not of separated SnO{sub x} entities. The protrusion patterns observed with STM on both surfaces are a topographic signature of such Sn-O layers on Pt{sub 3}Sn.
- OSTI ID:
- 20665060
- Journal Information:
- Physical Review. B, Condensed Matter and Materials Physics, Vol. 71, Issue 3; Other Information: DOI: 10.1103/PhysRevB.71.035410; (c) 2005 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA); ISSN 1098-0121
- Country of Publication:
- United States
- Language:
- English
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