Dresden 2009 – scientific programme

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O: Fachverband Oberflächenphysik

O 42: Poster Session II (Nanostructures at surfaces: arrays; Nanostructures at surfaces: Dots, particles, clusters; Nanostructures at surfaces: Other; Nanostructures at surfaces: Wires, tubes; Metal substrates: Adsorption of O and/or H; Metal substrates: Clean surfaces; Metal substrates: Adsorption of organic/bio moledules; Metal substrates: Solid-liquid interfaces; Metal substrates: Adsorption of inorganic molecules; Metal substrates: Epitaxy and growth; Heterogeneous catalysis; Surface chemical reactions; Ab-initio approaches to excitations in condensed matter; Organic, polymeric, biomolecular films– also with adsorbates; Particles and clusters)

O 42.12: Poster

Wednesday, March 25, 2009, 17:45–20:30, P2

A liquid phase injection method for the deposition of molecules and clusters on atomically defined Si/Ag surfaces — •Mathias Mende, Jedrzej Schmeidel, Herbert Pfnür, and Christoph Tegenkamp — Institut für Festkörperphysik, Universität Hannover, Abteilung Oberflächen, Appelstrasse 2, 30167 Hannover, Germany

Techniques for the deposition of nano-sized objects with limited thermal stability like organic molecules, metallic clusters and functionalized CNT’s are highly needed and therefore in the focus of current research. Besides electrospray ion beam deposition [1] also pulse valve injection is used [2].
We developed a technique for the soft deposition of neutral molecules and clusters out of a solvent in a controlled Argon atmosphere. Using a microdispenser system, droplets of different solvents with a diameter of 55 µm were reliably injected onto any surface, which can be prepared under UHV conditions. In order to correlate the concentration of Au clusters (3-5nm) on the surface with the concentration in the solvent, the droplets have been investigated by SEM and XPS. The distribution of height and size of the clusters was determined by STM on clean Si(111) 7x7 and Si(111) Ag √3×√3 surfaces. To test the functionality of the Au clusters and to demonstrate the preservation of the atomic structure in the vicinity of the nano-sized objects, STS measurements have been performed.
S. Rauschenbach et al., Small 2, 540 (2006)
Y. Terada et al., e-J. Surf. Sci. Nanotech. 2, 28 (2004)