Electronic Properties of TiO$_2$ Nanotubes

Details Electronic Properties of TiO$_2$ Nanotubes Electronic Properties of TiO$_2$ Nanotubes

2002-11-20

arxiv.org/abs/cond-mat/0211441v1

Physics

Condensed Matter

Materials Science

7 pages, 4 figures

Scientific paper

10.1016/S0038-1098(03)00254-0

quasi-one-dimensional (1D) titania nanostructures - single-walled nanotubes formed by rolling [101] planes of TiO$_2$ (anatase phase) are modeled and their electronic properties and bond orders indices are studied using the tight-binding band theory. We show that all zigzag (n,0)- and armchair (n,n)-like nanotubes are uniformly semiconducting, and the band gap trends to vanish as the tube diameters decrease. It was established that the zigzag (n,0) nanotubes configurations are more likely to form when the diameters are larger 1 nm. The Ti-O covalent bonds were found to be the strongest interactions in TiO$_2$ tubes, whereas Ti-Ti bonds proved to be much weaker.

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