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Effect of Heating Rate on the Morphology of Nano Titanium Dioxide

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Author(s): LIU Bo, KONG Wei, YE Bo, YU Zhong-Ping, WANG Hua, QIAN Guo-Dong, WANG Zhi-Yu

Journal: Journal of Inorganic Materials
ISSN 1000-324X

Volume: 25;
Issue: 9;
Start page: 906;
Date: 2010;
Original page

Keywords: nano titanium dioxide | morphology change | heating rate | solvothermal synthesis

ABSTRACT
Different shapes of nano titanium dioxide including sphere, rod and irregular-shaped polyhedron were prepared by solvothermal process at heating rates of 240¡䭱0min, 90¡䭱0min, 40¡䭱0min and 20¡䭱0min using tetrabutyl titanate as Ti source, oleic acid as solvent, dodecylamine as auxiliary agent. TEM, HRTEM and XRD were adopted to characterize the phase composition morphology and phase structure of the final products. The   micro-morphology and growth mechanisms of the titanium dioxide nanocrystals prepared at different heating rates were studied based on the TEM, HRTEM and XRD analyses£®The results show that spherical, rod-like, and irregular polyhedral points of titanium dioxide nanocrystals could be synthesized by strictly controlling the heating rate. The growth rate of along the (001) direction of nanocrystal shows a first upward and then downward trend with the decline of the heating rate.
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