Dresden 2003 – wissenschaftliches Programm

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CPP: Chemische Physik und Polymerphysik

CPP 20: POSTER A

CPP 20.42: Poster

Montag, 24. März 2003, 19:00–21:00, ZEU/250

In situ study of gold clusters on polymer thin films near the glass transition — •Virginie Chamard¹, Ruediger Weber², Jochim Stettner², Till H. Metzger³, Robert Fendt¹, Michael Sprung¹, Christian Gutt¹, Joern Erichsen⁴, Franz Faupel⁴, and Metin Tolan¹ — ¹Experimentelle Physik I, Universitaet Dortmund, Otto Hahn Str. 4, 44231 Dortmund — ²Institut fuer Experimentelle und Angewandte Physik, Christian-Albrechts-Universitaet, Leibnizstrasse 19, 24098 Kiel — ³ESRF, BP 220, 38043 Grenoble Cedex, Frankreich — ⁴Lehrstuhl fuer Materialverbunde, Technische Fakultaet der Universitaet Kiel, Kaiserstr. 2, 24143 Kiel

When gold atoms are evaporated onto a polymer surface, they do not form a continuous film but condense into a monolayer of almost monodisperse spheres with nanometer size. At the glass transition of the polymer, the clusters are sinking. The competition between the different forces acting on the clusters leads to a state where the clusters are lying on a plane at a definite depth under the surface. We used X-ray scattering methods to study the evolution of the gold clusters near the polymer glass transition. X-ray scattering methods are non-destructive techniques which are sensitive to the electron density contrast. In order to enhance the signal coming from the near surface region, we used the GISAXS geometry (Grazing Incidence X-ray Small Angle Scattering). The experiment was performed at the ID1 beamline (ESRF). When heated, we observe that the clusters size is increasing to a value which is temperature dependent. We show that thermal diffusion effects cannot explain this behaviour.