Dresden 2011 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 19: Metal substrates: Adsorption of O / H and inorganic molecules II
O 19.6: Vortrag
Montag, 14. März 2011, 18:30–18:45, WIL A317
Influencing the bonding and assembly of a multiterminal molecule on a metal surface — •Maya Lukas1,2, Kerrin Dössel1,2, Alexandrina Schramm1, Karin Fink1,2, Olaf Fuhr1,2, Christophe Stroh1, Marcel Mayor1,2,3, and Hilbert von Löhneysen1,2,4 — 1Karlsruhe Institute of Technology (KIT), Institute of Nanotechnology, D-76021 Karlsruhe — 2DFG Center of Functional Nanostructures (CFN), D-76049 Karlsruhe — 3University of Basel, Department of Chemistry, CH-4056 Basel — 4Karlsruhe Institute of Technology (KIT), Physics Institute and Institute for Solid State Physics, D-76049 Karlsruhe
The bond of a molecule to a metallic electrode is known to have a crucial influence on the molecular conductance. As electronic functionalities are integrated into molecules or several subunits are connected to a three-dimensional multiterminal molecule, it is not obvious that a "well-known" chemical linker group will lead to the bonding configuration known from simpler molecules.
We investigated a series of tripodal molecules on metal surfaces by STM. The chemical linker groups and the complex connecting the three wire-units are varied. We find that the position of molecules on the surface is governed by a subtle balance of intermolecular and molecule-surface interactions, partly in strong contrast to expectations. This emphasizes the need to characterize the nature of molecule-electrode contacts along with the investigation of the electronic conductance.