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.
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