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Anatase titanium dioxide (TiO2) nanocaps were created via a four-step process including the preparation of SiO2 spheres, the deposition of a TiO2 layer to fabricate SiO2@TiO2 composite spheres, the calcination for obtaining the crystal structure of anatase phase, and hydrofluoric acid (HF) etching to dissolve SiO2 cores. The SiO2@TiO2 spheres calcined at 700°C revealed fine photocatalytic activity...
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