Dresden 2011 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 27: Metal substrates: Adsorption of organic / bio molecules IV
O 27.1: Vortrag
Dienstag, 15. März 2011, 11:15–11:30, PHY C213
Alkali-induced nanopatterning of Ag(110) surface mediated by molecular adsorbate — •Giuseppe Mercurio1,2, Oliver Bauer3, Martin Willenbockel1,2, Benjamin Fiedler3, Christian Weiss1,2, Ruslan Temirov1,2, Sergey Subach1,2, Moritz Sokolowski3, and Stefan Tautz1,2 — 1Peter Grünberg Institut (PGI-3), Forschungszentrum Jülich, 52425 Jülich, Germany — 2JARA-Fundamentals of Future Information Technology — 3Institute for Physical and Theoretical Chemistry, University of Bonn
It is known for decades that alkali metals initiate the restructuring of fcc metal surfaces resulting in a composite patterned morphology. On the other hand, co-adsorbed metal atoms and organic molecules often form extended 2D networks due to the metal-molecular coordination reaction. Here we report on a new type of structural modification of the molecule-substrate interface, which is not only restricted to self-assembly of the adsorbed metal atoms and molecules, but it also involves significant morphological reorganization of the metallic surface. In the experiments, potassium atoms are deposited on a monolayer of the long-range ordered PTCDA/Ag(110) phase. Subsequent annealing forces potassium atoms to intercalate under the molecular layer partially unbinding PTCDA from the substrate. The complex interaction between potassium, PTCDA and substrate induces a significant silver mass-transfer and leads to the appearance of 1D stripe-structures of K atoms and PTCDA molecules on a nanopatterned silver surface. Structural and electronic properties of this pattern were studied by means of NIXSW, XPS, LEED and LT-STM.