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From Adlayer Islands to Surface Alloy: Structural and Chemical Changes on Bimetallic PtRu/Ru(0001) Surfaces
Author(s) -
Diemant Thomas,
Bergbreiter Andreas,
Bansmann Joachim,
Hoster Harry E.,
Behm R. Jürgen
Publication year - 2010
Publication title -
chemphyschem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.016
H-Index - 140
eISSN - 1439-7641
pISSN - 1439-4235
DOI - 10.1002/cphc.201000391
Subject(s) - bimetallic strip , scanning tunneling microscope , adsorption , monolayer , annealing (glass) , desorption , alloy , chemistry , metal , molecule , materials science , crystallography , chemical engineering , nanotechnology , metallurgy , organic chemistry , engineering
The correlation between structural and chemical properties of bimetallic PtRu/Ru(0001) model catalysts and their modification upon stepwise annealing of a submonolayer Pt‐covered Ru(0001) surface up to the formation of an equilibrated Pt x Ru 1− x /Ru(0001) monolayer surface alloy was investigated by scanning tunneling microscopy and by the adsorption of CO and D 2 probe molecules. Both temperature‐programmed desorption and IR measurements demonstrate the influence of the surface structure on the adsorption properties of the bimetallic surface, which can be explained by changes of the composition of the adsorption ensembles (ensemble effects) for D adsorption and by changes in the electronic interaction (ligand effects, strain effects) of the metallic constituents for CO and D adsorption upon alloy formation.