Crystallization of TiO2 powders and thin films prepared from modified titanium alkoxide precursors

I Karatchevtseva; D J Cassidy; Z Zhang; G Triani; K S Finnie; S L Cram; C J Barbé; John R Bartlett

doi:10.1111/j.1551-2916.2008.02375.x

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Crystallization of TiO2 powders and thin films prepared from modified titanium alkoxide precursors

Journal article

Peer reviewed

Crystallization of TiO2 powders and thin films prepared from modified titanium alkoxide precursors

I Karatchevtseva, D J Cassidy, Z Zhang, G Triani, K S Finnie, S L Cram, C J Barbé and John R Bartlett

Journal of the American Ceramic Society, Vol.91(6), pp.2015-2023

2008

DOI: https://doi.org/10.1111/j.1551-2916.2008.02375.x

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Abstract

The modification of titanium alkoxides by chemical reactions with ligands yields complexes or molecular clusters that are substantially different from those of the parent alkoxides. In this study, we investigate the structural evolution of powders and thin films prepared from two titanium oxo-alkoxyacylate clusters with different oxo-core structures [Ti6(μ3-O) 2(μ2-O)2](CH3COO) 8(μ2-OiPr)2(OiPr) 6 and [Ti6(μ3-O)6](μ-RCOO) 6(OiPr)6 ([6,4] and [6,6], respectively) as a function of annealing temperature. The structural evolution of powders and thin films prepared from the corresponding parent alkoxide Ti(OiPr) 4 (TiP) were also investigated for comparison. In all powders, the amorphous-to-anatase transformation occurred upon heating to 400°C. In sharp contrast, the anatase-to-rutile transformation of the powder prepared from the [6,6] cluster was significantly inhibited compared with the conventionally derived powder, with no rutile being detected even after annealing at 800°C for 1 h. This was attributed to the small crystallite size in the [6,6]-derived powder, which is lower than the critical size previously reported for the anatase-to-rutile transformation in similar sol-gel-derived materials. In thin films, the amorphous-to-anatase phase transition also occurred at temperatures as low as 400°C for coatings deposited from conventional TiP precursor and [6,4] cluster solutions. However, in contrast to the corresponding powders no rutile nucleation occurred even at 800°C in either film.

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Title: Crystallization of TiO2 powders and thin films prepared from modified titanium alkoxide precursors
Authors: I Karatchevtseva (Author) - Australian Nuclear Science and Technology Organization
D J Cassidy (Author) - Australian Nuclear Science and Technology Organization
Z Zhang (Author) - Australian Nuclear Science and Technology Organization
G Triani (Author) - Australian Nuclear Science and Technology Organization
K S Finnie (Author) - Australian Nuclear Science and Technology Organization
S L Cram (Author) - Australian Nuclear Science and Technology Organization
C J Barbé (Author) - Australian Nuclear Science and Technology Organization
John R Bartlett (Author) - University of Western Sydney
Publication details: Journal of the American Ceramic Society, Vol.91(6), pp.2015-2023
Publisher: Wiley-Blackwell Publishing Inc.
Date published: 2008
DOI: 10.1111/j.1551-2916.2008.02375.x
ISSN: 0002-7820
Organisation Unit: School of Science and Engineering - Legacy; University of the Sunshine Coast, Queensland
Language: English
Record Identifier: 99448842402621
Output Type: Journal article

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Web Of Science research areas: Materials Science, Ceramics