Dresden 2009 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 53: Nanostructures at surfaces: Dots, particles, clusters III
O 53.7: Vortrag
Donnerstag, 26. März 2009, 16:30–16:45, SCH A215
Metal-organic networks as templates for Fe and Co nanostructures — •Uta Schlickum1, Regis Decker1, Florian Klappenberger2, Giorgio Zoppellaro3, Svetlana Klyatskaya3, Mario Ruben3, Johannes Barth2, and Harald Brune1 — 1Institut de Physique des Nanostructures, EPF-Lausanne, Switzerland — 2Physik Department E20, Technische Universität München, Germany — 3Institut für Nanotechnologie, Forschungszentrum Karlsruhe, Germany
Recently we demonstrated the capability to form extremely regular metal-organic honeycomb nanomeshes using linear dicarbonitrile molecules in combination with Co atoms on Ag(111). The size of the network unit cell can be adjusted by the length of the employed linear molecular bricks [1]. In this contribution we present a new approach to steer the growth of metal-nanostructures using these metal-organic networks as templates. When depositing Fe or Co atoms onto the template, the metal atoms adsorb exclusively on top of the metal-organic network avoiding the open hexagonal cavities. In addition, the nucleation sites for Fe clusters can be shifted from the organic ligands towards the metal coordination nodes by changing the deposition temperature. Therefore, by tuning the honeycomb mesh size and the deposition temperature we can control the adsorption sites, the shape and the spacing of the small metal-clusters.
[1] U. Schlickum et al., Nano Lett. 3813 (2007)