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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 59.103: Poster
Mittwoch, 24. März 2010, 17:45–20:30, Poster B1
Formation of copper oxide surface structures via pulse injection of air onto Cu(111) surfaces — •Carmen Pérez León1, Michael Marz1, Christoph Sürgers1, and Hilbert v. Löhneysen1,2 — 1Karlsruher Institut für Technologie (KIT), Physikalisches Institut and DFG-Center for Functional Nanostructures (CFN), D-76131 Karlsruhe — 2Karlsruher Institut für Technologie (KIT), Institut für Festkörperphysik, D-76131 Karlsruhe
The pulse-injection method is widely used for deposition of molecules in solution onto clean surfaces. A potential source of contamination of the solution in the valve can be the ambient air. Therefore we have investigated the clean Cu(111) surface after injection of air by Auger electron spectroscopy and scanning tunneling microscopy (STM). The results show that mainly oxygen is adsorbed on the copper surface. The initial stages of oxidation of Cu(111) are governed by the restructuring of the surface, since Cu atoms from the step edges and terraces are incorporated into the growing surface oxide. The nucleation and growth of the oxide is strongly influenced by the substrate temperature during deposition as well as by the oxygen coverage. At submonolayer coverage three different kind of oxide islands are observed, whereas at monolayer coverage these are reduced to two. High resolution STM images reveal that oxidation at room temperature produces poorly ordered oxide structures. In contrast, surface oxides produced at higher temperature (∼ 200 ∘C) exhibit additional highly ordered structures corresponding to the strained Cu2O(111) lattice that coincides with the Cu(111) substrate.