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Porous anatase TiO 2 spheres have been synthesized by a microwave-assisted hydrothermal reaction of spherical particle precursors followed by annealing in air. The synthesized TiO 2 spheres are formed by interconnected nanocrystals with size of 8.7nm in average and have grain diameters of 250–400nm. After annealing at 500°C, the TiO 2 samples maintain spherical shape and develop...
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