Dresden 2006 – wissenschaftliches Programm

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MM: Metall- und Materialphysik

MM 37: Nanostructured Materials I

MM 37.2: Vortrag

Donnerstag, 30. März 2006, 15:00–15:15, IFW D

Pressure temperature phase diagrams of pure and Ag-doped nanocrystalline TiO2 photocatalysts — •Manuela Stir — Institut für theoretische und angewandte Physik, Universität Stuttgart, Pfaffenwaldring 57, D-70569, Stuttgart

M.Stir1, R.Nicula2, H.-E.Schaefer1 1Universitaet Stuttgart, Institut für theoretische und angewandte Physik, Pfaffenwaldring 57, D-70569 Stuttgart, Germany 2Universitaet Rostock, Institute für Physik August-Bebel-Str. 55, D-18055 Rostock, Germany

An essential issue in the development and use of nano materials in modern applications is the ability to maintain ultrafine particle sizes within extended temperature pressure ranges. Nanocrystalline titanium dioxide (nc-TiO2) is known as an excellent semiconductor photocatalyst for environmental protection applications such as the decontamination of polluted waste water and air purification. The photocatalytic efficiency of nc-TiO2 depends on its crystal structure and surface morphology and may further be enhanced by adequate metal-doping and by achieving mesoporous surfaces. The use of semiconductor photocatalysts in supported form (pellets or thin-films) eliminates the need for air-bubbling of the contaminated liquid media (to counteract powder sedimentation) and for subsequent complex photocatalyst powder recycling procedures.