Regensburg 2013 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 42: Organic/bio Molecules on Metal Surfaces IV

O 42.2: Vortrag

Mittwoch, 13. März 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 Kern^1,3, 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 (E_kin  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.