Phase transition control of nanostructured TiO2 powders with additions of various metal-chlorides

Sun-Jae Kim; Doo Sun Hwang; Nam Hee Lee; Dong Yun Lee; Jae Sung Song

doi:10.1117/12.521591

29 March 2004 Phase transition control of nanostructured TiO₂ powders with additions of various metal-chlorides

Sun-Jae Kim, Doo Sun Hwang, Nam Hee Lee, Dong Yun Lee, Jae Sung Song

Proceedings Volume 5275, BioMEMS and Nanotechnology; (2004) https://doi.org/10.1117/12.521591
Event: Microelectronics, MEMS, and Nanotechnology, 2003, Perth, Australia

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.

Citation Download Citation

Sun-Jae Kim, Doo Sun Hwang, Nam Hee Lee, Dong Yun Lee, and Jae Sung Song "Phase transition control of nanostructured TiO₂ powders with additions of various metal-chlorides", Proc. SPIE 5275, BioMEMS and Nanotechnology, (29 March 2004); https://doi.org/10.1117/12.521591

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