Dresden 2009 – wissenschaftliches Programm
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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 42.33: Poster
Mittwoch, 25. März 2009, 17:45–20:30, P2
Investigation of self-sustained molecular wires by STM — •Kerrin Dössel1, Maya Lukas1, Alexandrina Stuparu1, Christophe Stroh1, Marcel Mayor1,2, and Hilbert v. Löhneysen3,4 — 1Forschungszentrum Karlsruhe, Institut für Nanotechnologie, D-76021 Karlsruhe — 2Universität Basel, Department of Chemistry, CH-4056 Basel — 3Universität Karlsruhe, Physikalisches Institut, D-76128 Karlsruhe — 4Forschungszentrum Karlsruhe, Institut für Festkörperphysik, D-76021 Karlsruhe
In recent years the electronic structure and in particular the conductance of organic molecules have been investigated in a growing number of experiments. A method frequently used to measure molecular conductance is the mechanically controlled break junction (MCBJ) technique. However, in MCBJs the nature of the contact of the molecule to the electrodes is not known. Theory is thus lacking important information to exactly model and thus understand molecular conductance. It is therefore desirable to fully characterize molecular wires which are binding stably to the electrodes. We investigate self-sustained molecules, that are designed to stand upright on a conducting substrate, which serves as one electrode, while the head-group is sticking out freely from the surface, accessible by the tip of our UHV STM. We used STM and STS to investigate the molecules' position and surrounding on the surface, the bond to the surface and the electronic properties of our tripodal molecules on several metallic surfaces at low temperature (30K).