Regensburg 2010 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 62: Graphene III

O 62.3: Vortrag

Donnerstag, 25. März 2010, 11:00–11:15, H31

Bimetallic nanoclusters self-assembled on Ru(0001) supported monolayer graphene — •Albert K. Engstfeld, Otavio B. Alves, Petra M. Erne, Harry E. Hoster, and R. Jürgen Behm — Institute of Surface Chemistry and Catalysis, Ulm University, D-89069 Ulm, Germany

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]. Pt clusters formed this way on graphene/Ru(0001) have heights of 1-5 atomic layers and lateral diameters in the range 1-4 nm. In view of a potential utilization as model systems in electrocatalysis, 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 size distributions of Ru and PtRu clusters in comparison to the properties of Pt clusters. For the bimetallic clusters, we will also elucidate the structural differences depending on whether Pt or Ru is deposited first, and we will discuss possible consequences for their (electro-)chemical properties.
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Yi Pan et al., Appl.Phys.Lett. 95, 2009, 093106.
K. Donner and P. Jakob, J.Chem.Phys. 131, 2009, 164701.