Regensburg 2010 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 59: Poster Session II (Nanostructures at surfaces: Dots, particles, clusters; Nanostructures at surfaces: arrays; Nanostructures at surfaces: Wires, tubes; Nanostructures at surfaces: Other; Plasmonics and nanooptics; Metal substrates: Epitaxy and growth; Metal substrates: Solid-liquid interfaces; Metal substrates: Adsoprtion of organic / bio molecules; Metal substrates: Adsoprtion of inorganic molecules; Metal substrates: Adsoprtion of O and/or H; Metal substrates: Clean surfaces; Density functional theory and beyond for real materials)
O 59.82: Poster
Mittwoch, 24. März 2010, 17:45–20:30, Poster B1
Investigation of self-sustained molecular wires — •Kerrin Dössel1, Maya Lukas1, Alexandrina Stuparu1, Christophe Stroh1, Karin Fink1, Marcel Mayor1,2, and Hilbert von Löhneysen3,4 — 1Institut für Nanotechnologie, KIT, D-76021 Karlsruhe — 2Department of Chemistry, University of Basel, CH-4056 Basel — 3Physikalisches Institut, KIT, 76128 Karlsruhe — 4Institut für Festkörperphysik, KIT, 76021 Karlsruhe
In recent years the conductance of organic molecules has been investigated in a growing number of scanning tunneling microscopy (STM) experiments since STM is capable of characterising the investigated system with (sub)molecular resolution. However, conductance measurements with the current along the long axis of a wire-like molecule are difficult to achieve by STM because the molecules have the tendency to "lie" with their long axis parallel to the surface. We investigate the electronic properties of taylor-made organic molecules: While one wire-like part of the molecule is lying with the long axis parallel to the surface another identical wire is sticking out freely from the surface, accessible by the tip of our STM. We used scanning tunneling microscopy and scanning tunneling spectroscopy to investigate the molecules' position and surrounding on the surface and the electronic properties at low temperature (30K). Due to the special geometry of our molecules we are able to investigate and compare the transport across the wire as well as along the wire in the same experiment without altering further parameters which might otherwise influence the conductance behaviour.