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O: Fachverband Oberflächenphysik

O 62: Graphene III

O 62.7: Vortrag

Donnerstag, 25. März 2010, 12:00–12:15, H31

graphene monolayer on Ru(0001) as a good template for metal deposition — •bin wang and marie-laure bocquet — Université de Lyon, Laboratoire de Chimie, Ecole Normale Supérieure de Lyon, CNRS, F69007 Lyon, France

Perfectly ordered graphene overlayers can be easily obtained on Ru(0001) surface and display a moiré pattern with large periodicities resulting from the mismatch between graphene and Ru lattices [1-2]. In previous works using DFT calculations, we have unveiled that the graphene overlayer displayed periodic ripples of 1.5 Å amplitude, alternating chemical and physical distances with Ru [3-6].

Here we show by an extensive screening over different substrates (Ir and Rh) and a related organic network (h-BN) the uniqueness of the C/Ru interface in terms of local graphitic morphology and reactivity. Next we explore the adsorption properties of several adatoms like Transition Metal atoms (Ru, Pt, Au) and find an enhanced reactivity of the graphene area chemically interacting with the Ru substrate [7]. Consequently, it makes epitaxial graphene a promising template for material science and catalysis.

[1] S. Marchini et al, Phys. Rev. B. 76, 075429 (2007)

[2] J. Wintterlin et al, Surface Science, 603, 1841 (2009)

[3] B. Wang et al, Phys. Chem. Chem. Phys. 10, 3530 (2008)

[4] B. Wang et al, Phys. Rev. Lett. 101, 099703 (2008)

[5] W. Moritz et al, submitted (2009)

[6] T. Brugger et al, Phys. Rev. B 79, 045407 (2009)

[7] B. Wang et al, submitted (2009).