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- Title
Near-band-gap luminescence from TiO<sub>2</sub> nanograss-nanotube hierarchical membranes.
- Authors
Liu, Lijia; Li, Jun; Sham, Tsun-Kong
- Abstract
Freestanding TiO2 nanograss-nanotube hierarchical membranes are synthesized from a Ti metal foil by electrochemical anodization. It is found that the two nanostructures exhibit different luminescence properties, which are also affected by the crystal phases upon phase transformation. An unusual near-UV luminescence is observed from the amorphous nanograss, which is found to be excitation element specific. The amorphous nanotube shows no luminescence. Upon calcination, both nanograss and nanotubes are crystalized into the anatase phase with some rutile phase present, and both structures emit visible green luminescence at slightly different energies. The luminescence mechanism is explored using UV-vis spectroscopy, X-ray absorption near-edge structures (XANES), and X-ray excited optical luminescence (XEOL), and its implications are presented.
- Subjects
BAND gaps; LUMINESCENCE; TITANIUM dioxide; NANOTUBES; ARTIFICIAL membranes; PHASE transitions; CALCINATION (Heat treatment); X-ray absorption near edge structure
- Publication
Canadian Journal of Chemistry, 2015, Vol 93, Issue 1, p106
- ISSN
0008-4042
- Publication type
Article
- DOI
10.1139/cjc-2014-0254