Berlin 2008 – wissenschaftliches Programm

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SYSA: Symposium Tayloring Organic Interfaces: Molecular Structures and Applications

SYSA 5: Poster Session SYSA

SYSA 5.70: Poster

Dienstag, 26. Februar 2008, 14:30–20:00, Poster A

Cu-Adatom-Mediated Bonding in close-packed Benzoate/Cu(110) Systems — •Maria Christina Lennartz, Nicolae Atodiresei, Silvia Karthäuser, and Stefan Blügel — Institute for Solid State Research, Research Centre Juelich, Juelich, Germany

Copper is an established metal in electronics industry and the special linkage between carboxylates and Cu(110) surfaces justifies that this system is regarded as an alternative to the well-known and intensively studied thiol/gold system. Therefore our aim is to investigate the structure and the electronic transport through the carboxylate/Cu(110) interface, experimentally and theoretically, and to use these data to build up molecular devices. Especially the electronic transport properties depend crucially on the molecular orientation and the crystalline structure. Therefore a major point of our interest is to control the lateral order of the molecular arrangements while determining the corresponding molecular transport properties. We will present a microscopic evidence for a new Cu-adatom stabilized high density phase of benzoate molecules on Cu(110) surfaces. Using UHV-STM investigations and density-functional theory calculations two different chemical species building the new structure, benzoate molecules and benzoate copper-adatoms molecules, could be identified. The energy calculations provide strong support that the benzoate copper-adatoms molecules form energetically favourable bonds with the surface, but are also more mobile on the surface.