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Proceedings Paper

Phase transition control of nanostructured TiO2 powders with additions of various metal-chlorides
Author(s): Sun-Jae Kim; Doo Sun Hwang; Nam Hee Lee; Dong Yun Lee; Jae Sung Song
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Paper Abstract

Formation behavior and photo-oxidation abilities of nanostructured TiO2 powders were investigated through a direct crystallization from aqueous TiOCl2 solutions containing various metal-chlorides at 100°C. The obtained TiO2 powders without any additives and those added with Ni2+, Fe3+ and Nb5+ ions, which have a similar positive ionic radius to Ti4+, were mainly crystallized with rutile phase, whereas those added with Al3+ and Zr4+ ions, which have a quite different positive ionic radius, were mainly crystallized with anatase phase. On the other hand, the secondary particles in the TiO2 powder consisted of acicular and spherical primary particles corresponding to rutile and anatase phases, respectively. From these results, it seems that the positive ionic radius of the additives would affect phase formation as well as morphology of TiO2 precipitates. Among the TiO2 powders prepared, Ni-added powder, which consisted mainly of rutile phase with a small amount of anatase phase, showed excellent photocatalytic ability in decomposition of 4-chlorophenol.

Paper Details

Date Published: 29 March 2004
PDF: 8 pages
Proc. SPIE 5275, BioMEMS and Nanotechnology, (29 March 2004); doi: 10.1117/12.521591
Show Author Affiliations
Sun-Jae Kim, Sejong Univ. (South Korea)
Doo Sun Hwang, Sejong Univ. (South Korea)
Nam Hee Lee, Sejong Univ. (South Korea)
Dong Yun Lee, Korea Electrotechnology Research Institute (South Korea)
Jae Sung Song, Korea Electrotechnology Research Institute (South Korea)

Published in SPIE Proceedings Vol. 5275:
BioMEMS and Nanotechnology
Dan V. Nicolau; Uwe R. Muller; John M. Dell, Editor(s)

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