Topochemical synthesis and photocatalytic activity of 3D hierarchical BaTiO microspheres constructed from crystal-axis-oriented nanosheets.

Novel BaTiO hierarchical porous microspheres were achieved by using HTiO·HO (HTO) hierarchical microspheres as a precursor template via a facile solvothermal method. Interestingly, the BaTiO microspheres were constructed with two-dimensional (2D) nanosheets, which were composed of many order nanocrystals with crystal-axis-orientation. The special hierarchical structure, which is both macroporous and mesoporous, exhibits a large specific surface area and a high total pore volume.