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

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

Offizielle URL: http://dx.doi.org/10.1016/j.apsusc.2011.02.121

Kurzbeschreibung (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.

Typ des Eintrags: Artikel
Erschienen: 2011
Autor(en): Ahmad, M. I. ; Fasel, C. ; Mayer, T. ; Bhattacharya, S. S. ; Hahn, H.
Titel: High temperature stability of nanocrystalline anatase powders prepared by chemical vapour synthesis under varying process parameters
Sprache: Englisch
Kurzbeschreibung (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.

Titel der Zeitschrift, Zeitung oder Schriftenreihe: Applied Surface Science
Band: 257
(Heft-)Nummer: 15
Verlag: Elsevier
Freie Schlagworte: Phase transition, Anatase, Chemical vapour synthesis, High temperature X-ray diffraction
Fachbereich(e)/-gebiet(e): Fachbereich Material- und Geowissenschaften > Materialwissenschaften > Disperse Feststoffe, Dispersive Solids
Fachbereich Material- und Geowissenschaften > Materialwissenschaften > Gemeinschaftslabor Nanomaterialien
Fachbereich Material- und Geowissenschaften > Materialwissenschaften > Oberflächenforschung / Surface Science
Fachbereich Material- und Geowissenschaften > Materialwissenschaften
Fachbereich Material- und Geowissenschaften
Hinterlegungsdatum: 04 Apr 2012 11:13
Offizielle URL: http://dx.doi.org/10.1016/j.apsusc.2011.02.121
ID-Nummer: 10.1016/j.apsusc.2011.02.121
Sponsoren: 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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