Please use this identifier to cite or link to this item: http://hdl.handle.net/20.500.12779/5072
Title: Adsorption of oxygen on Pt3Sn 110 studied by STM and LEED
Authors: M., Hoheisel
S., Speller
Atrei, Andrea Massimo 
U., Bardi
G., Rovida
Issue Date: 2005
Project: None 
Journal: PHYSICAL REVIEW. B, CONDENSED MATTER AND MATERIALS PHYSICS
Abstract: 
The adsorption of oxygen on the Pt3Sns110d alloy surface was studied by means of scanning tunneling microscopy sSTMd and low-energy electron diffraction sLEEDd. After exposure to 2300 L O2 at 750 K LEED shows additional cs232d spots with regard to the substrate ps231d 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 Pt3Sns110d surface resemble to a large extent structures obtained on the Pt3Sns111d 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 Pt3Sns111d indicate the formation of a Sn layer with chemisorbed oxygen on top, but not of separated SnOx entities. The protrusion patterns observed with STM on both surfaces are a topographic signature of such Sn-O layers on Pt3Sn.
Description: 
52877
URI: http://hdl.handle.net/20.500.12779/5072
ISSN: 1098-0121
DOI: 10.1103/PhysRevB.71.035410
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