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Submicrometer-sized TiO 2 hollow spheres (THS) were synthesized using a template method, which involves deposition of TiO 2 on SiO 2 spheres templates through sol–gel process, calcination to crystallize amorphous TiO 2 , and etching SiO 2 templates by hydrothermal treatment in NaOH solution. The evolution of the microstructure, crystallinity and photocatalytic...
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