Regensburg 2007 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 44: Poster Session II (Semiconductors; Oxides and Insulators: Adsorption, Clean Surfaces, Epitaxy and Growth; Surface Chemical Reactions and Heterogeneous Catalysis; Surface or Interface Magnetism; Solid-Liquid Interfaces; Organic, Polymeric, Biomolecular Films; Particles and Clusters; Methods: Atomic and Electronic Structure; Time-resolved Spectroscopies)

O 44.31: Poster

Mittwoch, 28. März 2007, 17:00–19:30, Poster C

Ag cluster growth on biaxially oriented PET — •Günther Weidlinger, Lidong Sun, José Manuel Flores-Camacho, Michael Hohage, and Peter Zeppenfeld — Institut für Experimentalphysik, Johannes Kepler Universität Linz, Linz, Austria

Metallic clusters show new and interesting properties different from bulk material, e.g. catalytic effects as well as optical effects. We report our in-situ optical characterization of metal clusters during growth with Reflectance Difference Spectroscopy (RDS). Ag was deposited on biaxially oriented Polyethylene terephthalate (PET) at a constant rate of about 0.1nm/min in Ultra High Vacuum (UHV). Since Ag does not wet the PET surface, the Ag atoms form clusters on the surface and in the surface-near region. Cluster layers with a nominal thickness from 0.1nm to 5nm were investigated. A strong anisotropy of the particle plasmon induced by the biaxially oriented substrate has been observed. Furthermore, this anisotropy shows a strong dependence on the nominal thickness of the silver layer. The relation between the observed optical properties and the size as well as the spacial distribution of the clusters will be discussed.