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Growth of PtRu Clusters on Ru(0001)‐Supported Monolayer Graphene Films
Author(s) -
Engstfeld Albert K.,
Beckord Stephan,
Lorenz Christoph D.,
Behm R. Jürgen
Publication year - 2012
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.201200294
Subject(s) - bimetallic strip , monolayer , nucleation , cluster (spacecraft) , graphene , scanning tunneling microscope , deposition (geology) , substrate (aquarium) , materials science , transition metal , chemical engineering , metal , nanotechnology , catalysis , chemical physics , chemistry , crystallography , metallurgy , organic chemistry , paleontology , oceanography , engineering , sediment , geology , computer science , biology , programming language
We report on results of a detailed scanning tunnelling microscopy study on the formation, size and size distribution, and internal structure of small bimetallic PtRu clusters on a graphene monolayer film supported on a Ru(0001) substrate. These clusters, with sizes around ∼15 (Ru) or ∼40 (Pt) atoms per cluster at the lowest coverage, are interesting model systems for the catalytic behaviour of small metal PtRu particles, for example for application in electrocatalytic oxidation reactions. The clusters were generated by sequential deposition of the two metals at room temperature. The data reveal a distinct influence of the deposition sequence on the cluster formation process, with Ru pre‐deposition followed by Pt deposition leading to predominantly bimetallic clusters, possibly with a core–shell‐type structure, while the reverse sequence results in co‐existent mono‐ and bimetallic clusters, where the latter are likely to intermix at the interface. The observations are related to the nucleation process of the respective metals on the templated surface, and the 2D growth behaviour of the two metals.