Berlin 2005 – wissenschaftliches Programm

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O: Oberflächenphysik

O 46: Adsorption an Oberfl
ächen V

O 46.5: Vortrag

Dienstag, 8. März 2005, 16:45–17:00, TU EB420

Nanostructuring with silver on Au-Si(111) — •C. Seifert, C. Wiethoff, F.-J. Meyer zu Heringdorf, and M. Horn-von Hoegen — Universität Duisburg-Essen, Standort Essen

Self-assembly of 1D nanostructures on surfaces usually requires anisotropic qualities of the substrate e.g. vicinial cut of the surface. Gold adsorption over 350^∘C on the non-anisotropical Si(111) surface produces anisotropically formed (5x2) domains, with domain shapes rounding up at higher temperatures. Annealing preparations with slightly higher gold coverage than necessary at higher temperatures over 800 ^∘C leads to creation of a surface with the 2-fold direction mainly aligned along the step direction of the remaining steps. In order to use these surfaces as template for silver wire growth - atoms diffuse faster along the 2-fold direction of the (5x2) reconstruction - the alloying of silver with gold on this surface has to be understood better. Measurements on the formation of Ag/Au alloys have been done with RT-STM and high resolution LEED. A phasediagram for Silver on Au(5x2)-Si(111) is provided.