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O: Oberflächenphysik

O 4: Nanostructures I

O 4.1: Vortrag

Montag, 27. März 2006, 11:15–11:30, PHY C213

Self-Organized Titanium Oxide Nanotube-Layers:Formation and Applications — •Jan Macak and Patrik Schmuki — University of Erlangen Nuremberg, Dept. of Materials Science, LKO, Martensstr. 7, 91058 Erlangen, Germany

The presentation shows approaches to achieve electrochemical fabrication of self-organized high aspect ratio titanium oxide nanotubes. Key to obtain highly defined tubes is an optimized and controlled anodization of Ti in fluoride containing solutions. In general, the morphology of the tubular layers is affected strongly by the electrochemical parameters such as solution pH and anodization voltage. By optimizing the local electrochemical conditions within the tubes layers consisting of highly ordered TiO2 nanotubes with a length of several micrometers can be grown on Ti surfaces. The diameters that can be obtained range from 20 nm to 200nm * typical wall thicknesses are in the range of 10-20 nm. Except for the formation of the tubes also (potential) applications will be discussed. Titanium oxide is a highly functional material that has numerous interesting properties, for example, in solar energy conversion, catalysis of decomposition of organic compounds (self-cleaning), wettability and biocompatibility. Therefore this simple approach to produce this highly defined nanoscopic form of TiO2 bears a high potential for technological exploitation.