Dresden 2009 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 42: Poster Session II (Nanostructures at surfaces: arrays; Nanostructures at surfaces: Dots, particles, clusters; Nanostructures at surfaces: Other; Nanostructures at surfaces: Wires, tubes; Metal substrates: Adsorption of O and/or H; Metal substrates: Clean surfaces; Metal substrates: Adsorption of organic/bio moledules; Metal substrates: Solid-liquid interfaces; Metal substrates: Adsorption of inorganic molecules; Metal substrates: Epitaxy and growth; Heterogeneous catalysis; Surface chemical reactions; Ab-initio approaches to excitations in condensed matter; Organic, polymeric, biomolecular films– also with adsorbates; Particles and clusters)

O 42.6: Poster

Mittwoch, 25. März 2009, 17:45–20:30, P2

Monodisperse micro-island formation on Ni/Ru(0001) monolayers — •Peter Jakob¹, Kai Anhut¹, Sebastian Schnur², and Axel Groß² — ¹Fachbereich Physik, Philipps-Universität Marburg, D-35032 Marburg, Germany — ²Institut für Theoretische Chemie, Universität Ulm, D-89069 Ulm, Germany

The formation of virtually identical and thermally stable Ni micro-islands (trimers) is presented. In our combined experimental and theoretical investigation we define the conditions for their unusual creation (expulsion of Ni atoms or trimers from the underlying substrate by means of adsorbate induced compressive stress) and give a detailed characterization of the micro-islands’ structural properties, chemical composition and electronic/magnetic properties [1]. Specifically, we show that their exceptional structural and thermal stability can be ascribed to oxygen attached to the islands, thereby forming (metallic) Ni-oxygen composites. Our observation of a high density of identical clusters represents a major contribution to overcome a common challenge in materials science related to establishing a correlation between structural and catalytic/electronic properties of nanoscale objects. Usually, the various approaches lead to a dazzling array of sizes and shapes rather than monodisperse particles in a well-defined environment.

[1] P. Jakob, K. Anhut, S. Schnur, and A. Groß, Phys. Rev. Lett. 101, 206101 (2008).