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A comparative study on crystallization behavior, phase stability, and binding energy in pure and Cr-doped TiO2 nanotubes

Published online by Cambridge University Press:  29 August 2012

It Meng Low ,
Hani Albetran ,
Victor Manuel Prida ,
Victor Vega ,
Posman Manurung  and
Mihail Ionescu
It Meng Low*
Affiliation:
Department of Applied Physics, Centre for Materials Research, Curtin University, Perth, Western Australia 6845, Australia
Hani Albetran
Affiliation:
Department of Applied Physics, Centre for Materials Research, Curtin University, Perth, Western Australia 6845, Australia
Victor Manuel Prida
Affiliation:
Department of Physics, University of Oviedo, Calvo Sotelo s/n, 33007-Oviedo, Spain
Victor Vega
Affiliation:
Department of Physics, University of Oviedo, Calvo Sotelo s/n, 33007-Oviedo, Spain
Posman Manurung
Affiliation:
Department of Physics, University of Lampung, Bandar Lampung 35145, Indonesia
Mihail Ionescu
Affiliation:
Institute for Environmental Research, Australian Nuclear Science and Technology Organisation, Sydney, New South Wales 2234, Australia
*
a)Address all correspondence to this author. e-mail: j.low@curtin.edu.au
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Abstract

Use of nanostructured TiO2 for photocatalysis is a cost-effective and sustainable technology. However, to make this an attractive viable technology will require the design of TiO2 photocatalyst capable of harnessing the energy of visible light. One possible solution is the doping of TiO2 to reduce its band gap. In this paper, the effect of Cr-doping by ion implantation on the in situ crystallization and phase stability of anodic TiO2 nanotubes at elevated temperature is described. Cr-doping has dramatically reduced the fraction of anatase-to-rutile transformation and lowered the crystallization temperature of anatase from 600 to 400 °C and rutile from 600 to 500 °C. Ion beam analysis by Rutherford backscattering spectrometry has confirmed the existence of Cr ions composition gradation in doped TiO2 nanotubes. The real doping of Ti lattices with Cr ions was evidenced by the analyses of surface compositions and chemical states of the nanotubes using x-ray photoelectron spectroscopy.

Keywords

ion-implantationanataserutilenanotubescrystallizationCr-doping
Type
Reviews
Information
Journal of Materials Research , Volume 28 , Issue 3: Focus Issue: Titanium Dioxide Nanomaterials , 14 February 2013 , pp. 304 - 312
Copyright
Copyright © Materials Research Society 2012

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