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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 14: Poster: Interfaces and Thin Films
CPP 14.7: Poster
Monday, March 22, 2010, 16:30–18:00, Poster C
Layer-by-layer fabrication of hierarchical structures in sol-gel templated thin titania films — •Jan Perlich1,2, Mine Memesa3, Alexander Diethert1, Ezzeldin Metwalli1, Weinan Wang1, Stephan V. Roth2, Andreas Timmann2, Jochen S. Gutmann3, and Peter Müller-Buschbaum1 — 1TU München, Physik-Department LS E13, Garching — 2HASYLAB at DESY, Hamburg — 3Max-Planck-Institute for Polymer Research, Mainz
Nanostructured titania thin films have gained great popularity in a variety of applications such as coatings, photocatalysis, gas sensing, and photovoltaics. For most of these applications a defined morphology of the titania nanostructures is crucial for the functionality and significantly influences the performance. The morphology determines the volume-to-surface ratio and hence the surface available for interfacial reactions. In order to increase the surface area the fabrication of titania nanostructures with hierarchical order of different structural levels is investigated. The nanostructures are prepared with a diblock-copolymer assisted sol-gel process. By iterative spin-coating of the solution onto silicon substrates a thin polymer-nanocomposite film is deposited and transformed to purely anatase titania nanostructures via calcination. This procedure is repeated three times on top of the substrate. The approach is monitored with grazing incidence small angle X-ray scattering (GISAXS) performed at the synchrotron beamline BW4 of DESY HASYLAB after each fabrication step. With scanning electron microscopy the final hierarchical structure is imaged. From the characterization different structural levels are clearly identified.