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Influence of the TiO2 precursors on the thermal and structural stability of titanate-based nanotubes

Published online by Cambridge University Press:  28 December 2012

Silviu Preda ,
Valentin Serban Teodorescu ,
Adina Magdalena Musuc ,
Cristian Andronescu  and
Maria Zaharescu
Silviu Preda
Affiliation:
Department of Oxide Compounds and Material Science, Romanian Academy, “Ilie Murgulescu” Institute of Physical Chemistry, 060021 Bucharest, Romania
Valentin Serban Teodorescu
Affiliation:
Laboratory of Atomic Structures and Defects in Advance Materials, National Institute for Research and Development on Materials Physics, 077125 Magurele, Romania
Adina Magdalena Musuc*
Affiliation:
Department of Chemical Kinetics, Romanian Academy, “Ilie Murgulescu” Institute of Physical Chemistry, 060021 Bucharest, Romania
Cristian Andronescu
Affiliation:
Department of Oxide Compounds and Material Science, Romanian Academy, “Ilie Murgulescu” Institute of Physical Chemistry, 060021 Bucharest, Romania
Maria Zaharescu*
Affiliation:
Department of Oxide Compounds and Material Science, Romanian Academy, “Ilie Murgulescu” Institute of Physical Chemistry, 060021 Bucharest, Romania
*
a)Address all correspondence to these authors.e-mail: musucadina@yahoo.com
b)e-mail: mzaharescu@icf.ro
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Abstract

The influence of different TiO2precursors (laboratory-prepared sol–gel powders, dried and thermally treated at 400 °C, and commercial powders such as anatase by Aldrich and P25 Aeroxide by Evonik) on the structure and morphology of the titanate nanotubes obtained by hydrothermal method was investigated by x-ray diffraction (XRD) and transmission electron microscopy (TEM) measurements. In all cases, titanate-based nanotubes were obtained, having similar structure and morphology. The effect of the thermal treatment on the structural stability was also studied by differential thermal analysis and thermogravimetry analysis (TG/DTA) and differetial scanning calorimetry (DSC) measurements up to 600 °C, to determine the transformation of titanate nanotubes into other phases. Complementarily, by XRD investigation, the phases that develop after the thermal treatment of the titanate nanotubes in 110–400 °C temperature range were identified. The TEM micrographs come to confirm the deterioration of morphology and transformation from nanotubes to particles. The thermal stability of the investigated nanotubes led to the conclusion that this property depends not only on the sodium content but also on the type of precursor. The highest thermal stability was noticed for the nanotubes synthesized starting with anatase (Aldrich) commercial powder.

Keywords

titanate nanotubeshydrothermalnanostructure

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Type
Reviews
Information
Journal of Materials Research , Volume 28 , Issue 3: Focus Issue: Titanium Dioxide Nanomaterials , 14 February 2013 , pp. 294 - 303
Copyright
Copyright © Materials Research Society 2013

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