Regensburg 2010 – wissenschaftliches Programm
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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 17: Interfaces and Thin Films I
CPP 17.4: Vortrag
Dienstag, 23. März 2010, 10:30–10:45, H39
Thermal stability of spin-coated and sprayed colloidal PS-films — •Gerd Herzog1,2, Adeline Buffet2, Mottakin M. Abul Kashem2, Rainer Gehrke2, Peter Müller-Buschbaum3, Jan Perlich2, Matthias Schwartzkopf2, Wilfried Wurth1, and Stephan V. Roth2 — 1Institut für Experimentalphysik der Universität Hamburg, Luruper Chaussee 149, D-22761 Hamburg, Germany — 2HASYLAB at DESY, Notkestr. 85, D-22607 Hamburg, Germany — 3Physik-Department E13, TU München, James-Franck-Str. 1, D-85748 Garching, Germany
Installation of large scale colloidal nanoparticle thin films is of great interest in sensor technology or magnetic storage [1]. Among the methods used are dip-coating, spin-coating and spray deposition. Often, such devices are operated at elevated environmental or thermal conditions. In our study presented here, we investigated in-situ the effect of heat treatment on the structure of differently prepared colloidal solutions of polystyrene nanospheres by grazing incidence small angle x-ray scattering (GISAXS) and optical microscopy. We used two routes to install large scale coatings on silicon wafers, namely spin-coating and spray-coating of colloidal polystyrene (PS) nanospheres, having different outer end groups. Our first results indicate that thermal annealing in the vicinity of the glass transition temperature of pure PS leads to a rapid loss in the long range order in spin-coated films. Our model uses an increased mobility of the nanoparticles to explain this behaviour [2]
[1] Bigioni et al., Nature Materials 5, 265-270 (2006) [2] Herzog, Diplomarbeit, Universität Hamburg (2009)