Berlin 2018 – scientific programme
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O: Fachverband Oberflächenphysik
O 49: Poster: Nanostructures on Surfaces I
O 49.4: Poster
Tuesday, March 13, 2018, 18:15–20:30, Poster A
Efficient anchoring of molecular end groups via electric field driven chemical reaction — •Tomasz Michnowicz1, Bogdana Borca1,2, Remi Petuya3, Marcel Pristl1, Verena Schendel1, Ivan Pentegov1, Ulrike Kraft1, Hagen Klauk1, Peter Wahl1,4, Andres Arnau3,5, Uta Schlickum1, and Klaus Kern1,6 — 1Max Planck Institute for Solid State Research, Germany — 2National Institute of Materials Physics, Romania — 3Donostia International Physics Centre, Spain — 4Unviersity of St Andrews, United Kingdom — 5Basque Country University CSIC-UPV/EHU, Spain — 6Ecole Polytechnique Federale de Lausanne, Switzerland
One of the challenges of single molecule electronics is to form a stable bond of the desired molecule to the metal electrodes, providing low resistance at the molecule-metal interfaces. One of the tools allowing both controlled manipulation of single molecules and probing their properties, including the electric conductance, is Scanning Tunnelling Microscopy (STM). We show that a direct desulfurization reaction of a single thiophene unit embedded in a tetracenothiophene molecule on a Cu (111) surface can be driven by an electric field present in the STM tip-sample junction. This controlled, atomically precise reaction leads to the formation of covalent bonds between two carbon and two copper surface atoms. The enhanced coupling leads to 50% increase of the electric conductance measured by precisely contacting the molecules at the desired atomic positions and forming a molecular bridge between the metallic STM tip electrode and the metallic surface electrode.