Effect of Heating Rate on the Morphology of Nano Titanium Dioxide

Different shapes of nano titanium dioxide including sphere,rod and irregular-shaped polyhedron were prepared by solvothermal process at heating rates of 240℃/10min,90℃/10min,40℃/10min and 20℃/10min 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.