Dresden 2009 – wissenschaftliches Programm
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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 28: POSTERS Interfaces and Thin Films
CPP 28.16: Poster
Mittwoch, 25. März 2009, 17:00–19:00, P3
Optical microscopy of colloidal polymeric thin films - ordering on large length scales — •Jannis Lehmann1,2, Gerd Herzog1,3, Adeline Buffet1, Peter Müller-Buschbaum4, Rainer Gehrke1, and Stephan V. Roth1 — 1DESY, Notkestr. 85, D-22607 Hamburg, Germany — 2Univ. Hamburg, Dep. f. Physik, Jungiusstr. 9, D-20355 Hamburg, Germany — 3IExpPh, Univ. Hamburg, Luruper Chaussee 149, D-22761 Hamburg, Germany — 4Physik-Department E13, TU München, D-85748 Garching, Germany
Colloidal films are widely applied in many areas of research and technology, e.g. magnetic data storage or due to their optical properties [1,2,3]. We focused on the long-range order of spin-coated (on top of basic cleaned Si-wafers) colloidal polystyrene spheres (diameter 100nm) by using optical microscopy. We investigated the influence of colloidal concentration, spin-coating parameters and annealing on the structure of the colloidal film. Especially, annealing is performed far below as well as near the glass transition temperature of polystyrene of about 100°C to investigate the influence of mobility on the structure of the film during. We clearly see a regular periodic constitution of colloid-islands, which are homogeneously ordered on the surface. This long-range order extends from some ten micrometers to over several millimeters.
[1] Abul Kashem et al., Macromolecules 40, 5075-5083 (2007)
[2] Siffalovic et al., Phys. Rev. B 76, 195432 (2007)
[3] Roth et al., Appl. Phys. Lett. 91, 091915 (2007)