e-Journal of Surface Science and Nanotechnology
Online ISSN : 1348-0391
ISSN-L : 1348-0391
Conference -ICSFS-14-
PtxCe1-x Surface Alloys on Pt(111): Structure and Adsorption
Jan Markus EssenConrad BeckerKlaus Wandelt
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2009 Volume 7 Pages 421-428

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Abstract

A reinvestigation of the alloying behavior between vapor deposited cerium and a Pt(111) substrate has led to a refined understanding of the structural and adsorption properties of PtxCe alloy surfaces. Systematic LEED experiments as a function of cerium coverage and annealing temperature enable a clearer correlation between a number of known as well as new surface alloy phases and transitions between them. Coverages of up to 1 ML Ce lead to the formation of a (2 × 2) LEED pattern. Initial coverages between 1 and 1.5 ML result in the formation of a (2 × 2)+(1.98 × 1.98)R30° structure. More than 2 ML Ce are needed to produce a pure (1.98 × 1.98)R30° structure and, finally, more than 3 ML Ce lead to the formation of a (1.98 × 1.98)+(1.98 × 1.98)R30° phase, after annealing to temperature of up to 1000 K. A comparison with the most relevant bulk PtxCe laves phases; i.e. Pt5Ce, Pt3Ce and Pt2Ce, suggests a transition from a more “surface alloy like” character of the (2 × 2) structure to a more “bulk alloy like” character for the (1.98 × 1.98)-structure phases. CO adsorption experiments, using TPD and HREELS, suggest a pure Pt-kagomé surface termination of all the formed PtxCe alloy layers on Pt(111). [DOI: 10.1380/ejssnt.2009.421]

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