Regensburg 2013 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 66: Oxide Surfaces II
O 66.7: Vortrag
Donnerstag, 14. März 2013, 12:00–12:15, H42
Single molecules in a petri dish: Iodine dissociation of CHP on a hexagonal boron nitride monolayer — •Thomas Dienel1, Roland Widmer1, Ari P. Seitsonen2, Jürg Hutter2, and Oliver Gröning1 — 1nanotech@surfaces Lab, Empa, Überlandstrasse 129, CH-8600 Dübendorf, Switzerland — 2Physical Chemistry Institute, University of Zurich, CH-8057 Zurich, Switzerland
Well-defined monolayers of hexagonal boron nitride (h-BN) can be produced by thermal decomposition of borazine (HBNH)3 on transition metal surfaces. On Rh(111) a strongly corrugated superstructure of depressions with a periodicity of 3.22nm is formed. There weakly bonded h-BN regions called ”wires” separate strongly bonded ”pores” with a diameter of 1.5nm, where organic molecules can be efficiently trapped[1]. We report on the adsorption behavior and properties of hexaiodo-substituted macrocycle cyclohexa-m-phenylene (CHP) on corrugated h-BN. The CHP molecules adsorb within the pores and are aligned in [12] direction of the superstructure reflecting the inner structure of the h-BN monolayer. The terminal iodine atoms of the CHP can be dissociated by thermal annealing [2, 3]. Contrary to the case on metals, the h-BN substrate imposes a distinct abstraction sequence, which we follow in situ by scanning tunneling microscopy and DFT calculations. With these insights to the catalytic properties of h-BN we pave the road to bottom-up fabrication of graphene by aryl-aryl coupling on h-BN. [1] S. Berner et al., Angew. Chem. Int. Ed. 46 (2007) 5115. [2] M. Bieri et al., Chem. Commun., 45 (2009) 6919. [3] M. Bieri et al., JACS , 132 (2010) 16669.