Anatase-Type Ti1-2xNbxAlxO2 Solid Solution/Silica (SiO2) Composite Nanoparticles: Synthesis, Phase Stability, and Photocatalytic Performance
Composite nanoparticles (anatase-type Ti1-2XNbXAlXO2 solid solution/SiO2) were directly synthesized from precursor solutions in the presence of urea under mild hydrothermal conditions at 180 °C for 5 h. The crystallite size of anatase was gradually decreased with increased silica content in the composite nanoparticles formed under weakly basic hydrothermal conditions via the hydrolysis of urea. The composite nanoparticles with composition Ti0.9Nb0.05Al0.05O2/SiO2 = 100/10 mol% showed good photocatalytic activity. The anatase-to-rutile phase transformation in the course of heating in air was retarded to maintain the anatase-type structure up to more than 1050 °C without a trace of rutile phase by the formation of composite nanoparticles (Ti0.90Nb0.05Al0.05O2/SiO2 = 100/20 mol%) with amorphous silica.
Jian-Feng Nie and Allan Morton
M. Hirano and N. Kuno, "Anatase-Type Ti1-2xNbxAlxO2 Solid Solution/Silica (SiO2) Composite Nanoparticles: Synthesis, Phase Stability, and Photocatalytic Performance", Materials Science Forum, Vols. 654-656, pp. 2735-2738, 2010