Berlin 2012 – wissenschaftliches Programm
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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 30: New Perspectives of Scattering at Soft Matter
CPP 30.12: Vortrag
Mittwoch, 28. März 2012, 18:30–18:45, C 264
Millisecond time resolution GISAXS investigation of metal nanoparticle growth on soft and hard surfaces — Ezzeldin Metwalli1, Volker Körstgens1, Adelin Buffet2, Jan Perlich2, Stephan V. Roth2, and •Peter Müller-Buschbaum1 — 1TU München, Physik-Department, LS Funktionelle Materialien, James-Franck-Str. 1, 85748 Garching, Germany — 2HASYLAB at DESY, Notkestr. 85, 22603 Hamburg, Germany
Metal deposition on solid supports and polymer surfaces is of importance in many areas such as metal electrodes and engineered nano-materials [1]. Here, gold in its atomic state is deposited on both soft homopolymer films and hard silicon surface by utilizing a DC magnetron sputtering deposition system. With the unprecedented time resolution of ten milliseconds, the nucleation/growth dynamics of gold nanoparticles on both surfaces is monitored using in situ real-time grazing incidence small angle x-ray scattering (GISAXS). An initial rapid change of the particle size and shape is detected and a large particle size distribution becomes narrower with increasing the particle size. At silicon surface, metal deposits exhibit heterogeneous distributions and asymmetric nanoparticle growth compared to those on soft polymer film. At high metal load, a smooth and uniform metal layer on the polymer surface is attributed to an initial high particle mobility and bridging interactions between particles. A transient network between the bridges and strong metal-metal interactions may explain the progressive slow dynamics at concentrated metal particle dispersions. [1] Kaune et al. ACS Appl.Mater.Interfaces 3, 1055 (2011)