Regensburg 2013 – scientific programme
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O: Fachverband Oberflächenphysik
O 42: Organic/bio Molecules on Metal Surfaces IV
O 42.2: Talk
Wednesday, March 13, 2013, 10:45–11:00, H38
C58 on Au(111): an STM-based study — Noelia Bajales1, Stefan Schmaus1, Toshio Miyamachi1, Wulf Wulfhekel1, Jan Wilhelm2, Melanie Stendel2, Michael Walz2, Alexej Bagrets2, Ferdinand Evers2, Seyithan Ulas3, •Bastian Kern1,3, Artur Böttcher3, and Manfred M. Kappes3 — 1Institute of Physics, Karlsruhe Institute of Technology (KIT), Wolfgang-Gaede-Str. 1, D-76131 Karlsruhe, Germany — 2Institute of Nanotechnology, Karlsruhe Institute of Technology (KIT), Hermann-von-Helmholtz-Platz 1, 76344 Eggenstein-Leopoldshafen, Germany — 3Institute of Physical Chemistry, Karlsruhe Institute of Technology (KIT), Fritz-Haber-Weg 2, 76131 Karlsruhe, Germany
Non-IPR C58 cages were adsorbed at room temperature onto Au(111) by low-energy cluster beam deposition (Ekin 6 eV [1]). The surface topography and electronic properties of the system were investigated with a 4K-STM. The topographic images reveal that in the early adsorption stage (i.e. at low coverages), the cages are pinned by step edges and dislocation point defects and act as nucleation centers for growth of 2D islands. The isolated monomers exhibit no internal structure due to covalent bonding to the Au(111) surface. The short oligomers reflect a spontaneous surface-mediated polymerization of the cages. Dimers and trimers exhibit unique topographic features which reveal the covalent nature of the intercage bonds. The surface-independent outermost C58 layers appear to be wide band semiconductors (HOMO-LUMO gap 1.2 eV). Experimental results are compared with detailed DFT calculations.