Regensburg 2010 – wissenschaftliches Programm
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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 40: Nanoparticles and Composite Materials I
CPP 40.4: Vortrag
Donnerstag, 25. März 2010, 10:15–10:30, H48
Real time GISAXS study of magnetic nanoparticle assemblies on polymer templates — •Ezzeldin Metwalli1, Kai Schlage2, Volker Körstgens1, Sebastien Couet2, Robert Meier1, Gunar Kaune1, Stephan V. Roth2, Ralf Röhlsberger2, and Peter Müller-Buschbaum1 — 1TU München, Physikdepartment E13, 85747 Garching — 2HASYLAB at DESY, Notkestr. 85, 22603 Hamburg, Germany
Hybrid materials consisting of metal nanoparticles dispersed in a polymer matrix[1,2] open pathways for engineering composites that exhibit advantageous electrical, optical, and magnetic properties. Using a portable DC magnetron sputtering deposition system, the incorporation of cobalt atoms into a microphase-separated polystyrene-block-polyethylene oxide P(S-b-EO) diblock copolymer film with parallel cylinder morphology is achieved. Time-resolved in situ grazing incidence small angle X-ray scattering (GISAXS) allows successfully to systematically investigate the formation and growth of Co nanoparticles into the polymer template. Cobalt atoms were found to wet selectively the polystyrene domains of the microphase-separated polymer film and then aggregate to form surface metal nanopatterns. Upon increasing the amount of metal content, the selectivity nature of the sputtering process was found to diminish with the formation of a pseudo-uniform metal layer. [1] E. Metwalli et al., Langmuir 24, 4265 (2008) [2] E. Metwalli et al., Langmuir 25, 11815 (2009)