Dresden 2011 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 67: Graphene IV
O 67.2: Vortrag
Donnerstag, 17. März 2011, 11:30–11:45, WIL B321
Nucleation behavior of Pt clusters on monolayer graphene supported by Ru(0001) — •Christoph U. Lorenz1, Albert K. Engstfeld1, Harry E. Hoster1,2, and R. Jürgen Behm1 — 1Ulm University, Institute of Surface Chemistry and Catalysis, 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 supported by metal single crystals were recently shown to allow facile fabrication of ordered arrays of virtually monodisperse metal nanoclusters by simple metal vapor deposition in UHV [1-3]. In this work we analyzed the nucleation behavior of Pt clusters on monolayer graphene supported by Ru(0001). The cluster size dependency on the deposition rate was determined by statistical evaluation of STM images. Furthermore we investigated the ripening behavior of the Pt clusters at elevated temperatures. The results of these experiments lead us to the proposal of mobile Pt oligomers during the initial nucleation process on the monolayer graphene films.
[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.