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 59.77: Poster

Mittwoch, 24. März 2010, 17:45–20:30, Poster B1

Self-assembled metal-organic networks of tripyridyl-triazine on Au(111) and Cu(111) surfaces — •Hendrik Mohrmann, Christian Lotze, Katharina J. Franke, and Jose I. Pascual — Institut für Experimentalphysik, Freie Universität Berlin

Self-assembled metal-organic networks have lately attracted a lot of interests since they possibly provide arrays of spins which have promising properties for applications in molecular electronics. We investigate the coadsorption of tripyridyl-triazine (t4pt) and Cobalt on noble metal surfaces by low and variable temperature scanning tunnelling microscopy and spectroscopy (STM/STS) in ultrahigh vacuum.

On Au(111), several highly ordered structures with a wide range of Co-N bond lengths and packing densities, depending on the Co/t4pt deposition rates and annealing temperatures, are observed. We also observe double layer islands in which Co atoms are coordinated in a 3-dimensional complex.

When deposited on Cu(111) t4pt forms a long-range ordered honey comb nanomesh. This structure is stabilized by coordination bonds of the lone-pair electrons of the pyridil groups to Cu adatoms as evidenced by conductance maps.