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High temperature stability of nanocrystalline anatase powders prepared by chemical vapour synthesis under varying process parameters

Ahmad, M. I. and Fasel, C. and Mayer, T. and Bhattacharya, S. S. and Hahn, H. (2011):
High temperature stability of nanocrystalline anatase powders prepared by chemical vapour synthesis under varying process parameters.
In: Applied Surface Science, Elsevier, pp. 6761-6767, 257, (15), ISSN 01694332,
[Online-Edition: http://dx.doi.org/10.1016/j.apsusc.2011.02.121],
[Article]

Abstract

Systematic variation in the high temperature stability of nanocrystalline anatase powders prepared by chemical vapour synthesis (CVS) using titanium (IV) isopropoxide under varying flow rates of oxygen and helium was obtained by progressively shifting the decomposition product from C3H6 to CO2. The as-synthesised powders were characterised by high temperature X-ray diffraction (HTXRD), simultaneous thermo-gravimetric analyses (STA), X-ray photoelectron spectroscopy (XPS), Fourier transform infrared spectroscopy (FTIR) and transmission electron microscopy (TEM). It was observed that the anatase to rutile transformation temperature progressively increased for samples synthesised at higher O2/He flow rate ratios. The improved anatase stability was attributed to the presence of incorporated carbon within the titania structure and confirmed by a high temperature carbon desorption peak.

Item Type: Article
Erschienen: 2011
Creators: Ahmad, M. I. and Fasel, C. and Mayer, T. and Bhattacharya, S. S. and Hahn, H.
Title: High temperature stability of nanocrystalline anatase powders prepared by chemical vapour synthesis under varying process parameters
Language: English
Abstract:

Systematic variation in the high temperature stability of nanocrystalline anatase powders prepared by chemical vapour synthesis (CVS) using titanium (IV) isopropoxide under varying flow rates of oxygen and helium was obtained by progressively shifting the decomposition product from C3H6 to CO2. The as-synthesised powders were characterised by high temperature X-ray diffraction (HTXRD), simultaneous thermo-gravimetric analyses (STA), X-ray photoelectron spectroscopy (XPS), Fourier transform infrared spectroscopy (FTIR) and transmission electron microscopy (TEM). It was observed that the anatase to rutile transformation temperature progressively increased for samples synthesised at higher O2/He flow rate ratios. The improved anatase stability was attributed to the presence of incorporated carbon within the titania structure and confirmed by a high temperature carbon desorption peak.

Journal or Publication Title: Applied Surface Science
Volume: 257
Number: 15
Publisher: Elsevier
Uncontrolled Keywords: Phase transition, Anatase, Chemical vapour synthesis, High temperature X-ray diffraction
Divisions: 11 Department of Materials and Earth Sciences > Material Science > Dispersive Solids
11 Department of Materials and Earth Sciences > Material Science > Joint Research Laboratory Nanomaterials
11 Department of Materials and Earth Sciences > Material Science > Surface Science
11 Department of Materials and Earth Sciences > Material Science
11 Department of Materials and Earth Sciences
Date Deposited: 04 Apr 2012 11:13
Official URL: http://dx.doi.org/10.1016/j.apsusc.2011.02.121
Identification Number: doi:10.1016/j.apsusc.2011.02.121
Funders: DAAD, Bonn, Germany providing the financial support, Alexander von Humboldt Foundation, Bonn, Germany for providing financial support for a one-month stay for S.S. Bhattacharya
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