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 59.61: Poster
Mittwoch, 24. März 2010, 17:45–20:30, Poster B1
General aspects of surface alloy formation — •Andreas Bergbreiter1, András Berkó2, Albert K. Engstfeld1, Ralf T. Rötter1, Harry E. Hoster1, and R. Jürgen Behm1 — 1Institute of Surface Chemistry and Catalysis, Ulm University, D-89069 Ulm, Germany — 2Permanent address: Institute of Nanochemistry and Catalysis, of CRC-HAS, University of Szeged, H-6720 Szeged, Hungary
Surface confined alloys are excellent model systems for studies of structure-property relationships of bimetallic surfaces. They are formed by deposition of a guest metal B onto a substrate A, followed by annealing to a temperature, where place exchange between adatoms and atoms from the underlying surface layer becomes possible and diffusion into the bulk is sufficiently slow. We exemplarily confirmed by scanning tunneling microscopy and Auger electron spectroscopy for PtRu/Ru(0001) [2], PdRu/Ru(0001) [3,4], AuPt/Pt(111), AgPt/Pt(111), and AgPd/Pd(111), surface alloys are obtained for systems where metal B has a negative surface segregation energy within metal A [1]. By exchanging A and B, however, AB surface alloys are most likely overgrown by metal B, which we will demonstrate for RuPt/Pt(111) [5,6] in comparison to PtRu/Ru(0001) [2].
[1] A. Christensen et al., Phys.Rev.B 56(10), 1997, 5822.
H.E. Hoster et al., Phys.Chem.Chem.Phys. 10, 2008, 3812.
H. Hartmann et al., Surf.Sci. 603, 2009, 1439.
N. Rougemaille et al., Phys.Rev.Lett. 99, 2007, 106101.
A. Bergbreiter et al., Vacuum 84(1), 2009, 13.
A. Berkó et al., Surf.Sci. 603, 2009, 2556.