Regensburg 2013 – wissenschaftliches Programm
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DS: Fachverband Dünne Schichten
DS 27: Thin Film Characterization: Structure Analysis and Composition (XRD, TEM, XPS, SIMS, RBS,...) I
DS 27.3: Vortrag
Mittwoch, 13. März 2013, 17:45–18:00, H32
Growth kinetics of metal nanoparticles on polymer surfaces — •Ezzeldin Metwalli1, Volker Körstgens1, Adeline Buffet2, Jan Perlich2, Stephan V. Roth2, and Peter Müller-Buschbaum1 — 1TU München, LS für Funktionelle Materialien, Physik-Department, James-Franck-Str. 1, 85747 Garching, Germany — 2HASYLAB at DESY, Notkestr. 85, 22603 Hamburg, Germany
Metal layers on polymer films [1-4] are essential for many important nanodevices such as organic solar cells and light emitting diodes. Gold in its atomic state is deposited on several homopolymer and block copolymer films by utilizing a DC magnetron sputtering deposition system. With the unprecedented time resolution of 15 milliseconds, the nucleation/growth kinetics of gold nanoparticles on the polymer surfaces is monitored using in situ real-time grazing incidence small angle x-ray scattering (GISAXS) technique. An exponential growth of metal particle size on all polymer surfaces is observed prior to the formation of a quasi uniform metal layer. Below a certain critical particle size, an initial fast particle growth is due to high particle mobility. While a slower kinetics at concentrated metal dispersion is due to the strong metal-metal interactions. This novel kinetic study of metal growth on chemically different homopolymer films clearly explains the high selectivity characteristics of metals towards a particular block of diblock copolymer nanotemplates. 1. E.Metwalli et al. Langmuir 24, 4265 (2008) 2. E.Metwalli et al. Langmuir 25, 11815 (2009) 3. G.Kaune, E.Metwalli et al. ACS Appl. Mater. Interfaces 3, 1055 (2011) 4. X.Xia, E.Metwalli, et al. J. Phys. Condens. Matter 23, 254203 (2011)