Dresden 2011 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 88: Metal substrates: Adsorption of organic / bio molecules IX
O 88.4: Vortrag
Donnerstag, 17. März 2011, 18:00–18:15, PHY C213
Hierarchical interactions - network formation of organic molecules on graphene/Ru(0001) — •Michael Roos1, Daniela Künzel2, Harry E. Hoster1,3, Axel Groß2, and R. Jürgen Behm1 — 1Ulm University, Institute of Surface Chemistry and Catalysis, 89069 Ulm, Germany — 2Ulm University, Institute of Theoretical Chemistry, 89069 Ulm, Germany — 3Current address: Technische Universität München, Centre for Electromobility, 50 Nanyang Drive, Singapore 637553
Bis(terpyridine)derivatives (BTP) form highly ordered hydrogen-bonded 2D networks on solid surfaces. The hydrogen bond configurations and therefore the resulting structures are steered via the positions of the nitrogen atoms within the BTP molecules. On smooth surfaces such as graphite or metal single crystals, the molecule-substrate interactions play a secondary role for the structure formation, mainly by determining the rotational orientations of the ordered networks. In this contribution, we demonstrate that more pronounced template effects arise for substrates where the molecule-substrate interaction varies laterally at the nanometer scale. As an example, we will show the ordering behavior of BTP molecules on graphene monolayers grown on Ru(0001). Submolecularly resolved STM images show that the BTP molecules are confined to the valleys of the graphene. We will compare the resulting supramolecular assemblies with the ordered 2D networks formed by the same molecules on smooth substrates, and will discuss the effect of the template quantitatively by means of force field calculations and supporting thermal desorption experiments.