Superlattice structures and Nb-doping in self-organized TiO2 nanotube layers: Controlled growth and electronic properties

点击翻译按钮获取中文摘要

Recently, the electrochemical formation of self-organized TiO2 nanotubes has attracted considerable attention due to the high potential of the structures for nanoscale based technological applications. Typically, these nanotubes are formed by anodization of Ti in diluted HF electrolytes. Under specific electrochemical conditions, nanoporous layers form that consist of TiO2 nanotubes with a diameter of approximately 100 nm and a spacing to neighboring pores of about 150 nm. Recent experiments in our laboratory demonstrate that comparably thick layers (pm-range) of TiO2 nanotubes can be produced. One part of the present funding application aims at a detailed investigation of the growth limits and mechanisms involved in the selforganization and pore growth processes. A second path will explore the technological potential of the TiO2 nanotubes in view of the photoelectrochemical properties. Exploiting the semiconductive nature of TiO2 in the form of nanotubes for e.g., solar energy conversion and self-cleaning requires detailed investigations on the properties of the tubes upon annealing, doping, and dye sensitization.