Dresden 2006 – wissenschaftliches Programm
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O: Oberflächenphysik
O 29: Poster session II (Nanostructures, Magnetism, Particles and clusters, Scanning probe techniques, Time-resolved spectroscopy, Structure and dynamics, Semiconductor surfaces and interfaces, Oxides and insulators, Solid-liquid interfaces)
O 29.28: Poster
Mittwoch, 29. März 2006, 14:30–17:30, P2
Studying the dewetting behaviour of Ni-flims on oxydized Si(001) by GISAXS — •F. Garone1, Andrea Toma1, Francesco Buatier1, Corrado Boragno1, Ugo Valbusa1, Ian K. Robinson2, Wei Zhang2, Nicole M. Jeutter3, and Roberto Felici3 — 1Dipatimento di Fisica, Universita di Genova, via Dodecaneso 33 , 16146 Genova, Italy — 2Department of Physics, University of Illinois at Urbana-Champaign, 1110 West Green Street, Urbana, IL 61801-3080, USA — 3ESRF, 6 Rue Jules Hororwitz, 38000 Grenoble France
The development of materials with new electronic and/or chemical properties is pushing the research through the study of nano-objects. For obtaining surfaces with morphology features on the nano-meters scale, we can take advantage of self-aggregation phenomena, which is generally easier to integrate in industrial processes. However the size uniformity and control, they offer, are more complex. A method for obtaining metal nano-objects at the surface of oxides is based on dewetting phenomena. In this case a thin metal film grown on an inert substrate is heated up at high temperatures, until the surface tension of the metal becomes higher than the adhesive force of the film onto the substrate. At this point the metal forms small droplets. In this study we present real-time in-situ studies of the nucleation and formation of Ni metal clusters starting from an uniform metal film deposited on an oxidized Si(001) substrate. Films of different thicknesses have been annealed at different temperatures in the range 400-800 K. By following in time the evolution of the grazing incidence small angle scattering pattern we gained unique information on the dynamics at the base of the nano-particles formation.