Double‐Shelled TiO₂ Hollow Spheres Assembled with TiO₂ Nanosheets

Abstract

Abstract High‐quality double‐shelled TiO 2 hollow spheres (DHS‐Ti) assembled with TiO 2 nanosheets have been synthesized for the first time through a simple hydrothermal treatment of sSiO 2 @TiO 2 (TiO 2 ‐coated solid SiO 2 spheres). The double‐shelled structure shows a high BET surface area up to 417.6 m 2 g −1 . Anatase DHS‐Ti of high crystallinity can be obtained without structural collapse by calcination treatment. The effects of cetyl trimethylammonium bromide (CTAB) concentration, pH, and hydrothermal reaction temperature have also been investigated with a series of contrast experiments. A formation mechanism involving the in situ growth of amorphous TiO 2 nanosheets followed by the redeposition of dissolved silica species is proposed. Lastly, the DHS‐Ti forming strategy can be extended as a general strategy to fabricate various morphological hollow nanostructures and double‐shelled Pt nanocatalysts by rationally selecting functional sSiO 2 nanoparticles as core materials. This work could open up a new strategy for controllable synthesis of complex hollow structures and other functional materials.