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The nanocrystalline TiO2 powders with different crystallinity and phase structures were obtained by controlling hydrolysis rate and annealing temperature. Rutile phase TiO2 nanoparticles with crystallite sizes of about 80nm, were obtained by annealing the TiO2 powders at 700°C. The crystallite sizes of anatase phase TiO2 increases from 8 to 11nm and band gap energy ranges from 2.49 and 3.26eV, calculated...
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