Formation and luminescence of nanoterraces and elongated structures in sintered TiO2



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Maestre Varea, David and Cremades Rodríguez, Ana Isabel and Piqueras de Noriega, Javier (2006) Formation and luminescence of nanoterraces and elongated structures in sintered TiO2. Nanotechnology, 17 (6). pp. 1584-1588. ISSN 0957-4484

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Samples of rutile TiO2 have been prepared by sintering compacted powders under argon flow. Long (above 20 h) sintering times at 1500 degrees C led to the formation of rods with squared cross-sections in a broad range of sizes. A two-step annealing treatment, at two temperatures, was found to favour the growth of low-dimensional elongated structures as well as a terraced structure on the grain surface, producing samples with high surface to volume ratio. The cathodoluminescence (CL) spectrum of the initial powder, shows an emission centred at about 2.40 eV, which can be separated into three Gaussian bands at 2.19, 2.30 and 2.55 eV. The main features of the CL spectra of sintered samples are an infrared band at 1.52 eV and a complex band in the visible range, whose peak position shifts with the annealing temperature. In samples sintered for 30 h an emission at 1.80 eV appears, while the dominant emission at 1.52 eV, due to titanium interstitials, is quenched.

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© 2006 IOP Publishing Ltd Printed in the UK.
This work has been supported by MEC (project MAT-2003-00455) and by CAM (project GR/MAT 630-04).

Uncontrolled Keywords:Thin-Films, Polycrystalline Tio2, Growth, Photoluminescence, Deposition, Nanowires, Cathodoluminescence, Sensors, Oxide
Subjects:Sciences > Physics > Materials
ID Code:23191
Deposited On:15 Oct 2013 18:18
Last Modified:13 Feb 2018 15:13

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