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Dresden 2009 – scientific programme

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O: Fachverband Oberflächenphysik

O 22: Focused Session: Epitaxial Graphene III

O 22.3: Talk

Tuesday, March 24, 2009, 11:30–11:45, SCH 251

Adsorption of organic molecules on C/Ru(0001) - a combined STM and TPD study — •Michael Roos, Harry E. Hoster, and R. Jürgen Behm — Institute of Surface Chemistry and Catalysis, Ulm University, D-89069 Ulm, Germany

Bis(terpyridine)derivatives (BTP) form highly ordered hydrogen bonded 2D networks on graphite (HOPG) at both the solid/liquid [1,2] and the solid/gas [3,4] interface. These structures depend on the positions of the N-Atoms, which can be varied in the synthesis [1,2]. As recently found by temperature programmed desorption (TPD), the high translational and rotational mobility of BTP molecules on HOPG gives rise to a distinct entropic stabilization of the first monolayer. In this talk, we will show that this mobility is reduced when the HOPG substrate is replaced by a graphene monolayer on Ru(0001) with its Moiré-like corrugation [5]. As will be shown for two different BTP isomers, this lower mobility becomes apparent both in the 2D structures and in the desorption rates of the resulting adlayers.
C. Meier et al., J. Phys. Chem. B 109, 21015 (2005).
C. Meier et al., Angew. Chem. Int. Ed. 47, 3821 (2008).
H. E. Hoster et al., Langmuir 23, 11570 (2007).
A. Breitruck et al., Surf. Sci. 601, 4200 (2007).
S. Marchini et al., Phys. Rev. B 76, 075429 (2007).

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