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Structural Modification of Doped and Undoped Nanocrystalline TiO2 by Temperature-Resolved XRPD

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Abstract:

Nanocrystalline titania pigments were produced by a novel synthesis route consisting of a high temperature forced hydrolysis in a coordinating high-boiling solvent. The effect of synthesis conditions as well as doping with Cr, Sb and V on the particle size and on the anatase-to-rutile transformation was studied by temperature-resolved synchrotron powder diffraction. The experiments were performed directly on as-synthesized low concentration suspensions of titania nanoparticles (up to 230°C) and on dried titania nanoparticles (up to 950°C). Crystallite size of as-synthesized nanoparticles is in the 5 to 50 nm range, being affected by the synthesis conditions as well as by doping and exhibits a slow-rate coarsening trend with temperature. The anatase-to-rutile transformation is drastically influenced by both synthesis conditions and doping. In particular, doping affected the anatase-to-rutile transformation rate, while the synthesis conditions influenced the phase composition, causing the appearance of brookite.

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Periodical:

Advances in Science and Technology (Volume 51)

Pages:

99-104

DOI:

https://doi.org/10.4028/www.scientific.net/AST.51.99

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Online since:

October 2006

Authors:

F. Matteucci, G. Cruciani, M. Dondi, Giovanni Baldi, M.C. Dalconi, A. Barzanti, G. Lorenzi, C. Meneghini

Keywords:

Nanomaterial, Synchrotron Radiation (XRD), TiO2, X-Ray Powder Diffraction

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© 2006 Trans Tech Publications Ltd. All Rights Reserved

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