Shape-controlled Synthesis, Photoluminescence Property And Liquid Crystal Behaviour Of Anatase TiO₂ Nanocrystals

In this paper, we have adopted the solvothermal method by changing the molar ratio of TBT/OA/DDA, heating rate and adding sodium oleate, successfully synthesized the quasi-sphere, rod, mixture of quasi-sphere and rod, rhombic anatase TiO2 nanocrystalsFour morphologies of anatase TiO2 nanocrystals whose sizes are less than 50nm and well-uniform including quasi-sphere, rod, mixture of quasi-sphere and rod, rhombic were successfully synthesised by solvothermal method. The PL spectra excited at 330nm exhibits four peaks at 345nm,363nm,380nm and 402nm. We initially discovered and proved the direct transitions X1b→X2b(345nm) and X1b→X1a (363nm) which calculated by the theory. This research indicates that anatase TiO2 nanocrystals can be applied as the fluorescent probe.Well uniform anatase TiO2 nanorods (diameter about 1.5nm, length of 24-36nm) were successfully prepared by microemulsion method at unique aminolysis route with the molar ratio of TBT/OA/OLA= 2:10:3. We initially discovered the inorganic liquid crystal formed by anatase TiO2 nanorods, and researched the liquid crystal phase of anatase TiO2 nanorods at different concentrations. We firstly discovered the spherulite self-assembled by anatase TiO2 nanorods, this result is the significant breakthrough to the spherulite. The spherulite self-assembled by anatase TiO2 nanorods is negative spherulite, and had the property of obvious Maltase Cross. We carried out the preliminary research that the spherulite self-assembled by anatase TiO2 nanorods applied as displacement/pressure sensor and temperature sensor. According to the features of the spherulite, we can safely point out the spherulite formed by anatase TiO2 nanorods applied as enzyme nanocarrier, high-efficient adsorbent of toxic substances and novel high-efficient photocatalyst have the promising prospects.