Dresden 2011 – scientific programme
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O: Fachverband Oberflächenphysik
O 60: Poster Session IV (Solid/liquid interfaces; Semiconductors; Oxides and insulators; Graphene; Plasmonics and nanooptics; Electronic Structure; Surface chemical reactions; Heterogeneous catalysis)
O 60.54: Poster
Wednesday, March 16, 2011, 17:30–21:00, P4
Self-assembly of Pt, Ru and bimetallic PtRu clusters on Ru(0001) supported monolayer graphene — •Albert K. Engstfeld1, Christoph U. Lorenz1, Ottavio B. Alves1, Harry E. Hoster1,2, and R. Jürgen Behm1 — 1Institute of Surface Chemistry and Catalysis, Ulm University, D-89069 Ulm, Germany — 2Current address: Technische Universität München, Centre for Electromobility, 50 Nanyang Drive, Singapore 637553
The Moiré-type nm-scale patterns of graphene monolayers on metal single crystals were recently shown to allow facile fabrication of ordered arrays of virtually monodisperse metal nanoclusters by simple metal vapour deposition in UHV [1-3]. In view of a potential utilization as structurally well defined model systems in electrocatalysis, with extremely small metal clusters, we have tested the possibility of preparing Ru and bimetallic PtRu clusters by an analogous procedure. Based on statistically evaluated STM images, we will report on the nucleation behaviour of Ru and Pt clusters respectively and its consequences on bimetallic PtRu cluster growth, depending on the evaporation sequence of the two metals.
[1] A.T. N'Diaye et al., New J.Phys. 11, 2009, 103045.
[2] Yi Pan et al., Appl.Phys.Lett. 95, 2009, 093106.
[3] K. Donner and P. Jakob, J.Chem.Phys. 131, 2009, 164701.