he SAED pattern taken on the TiO2 regions (Figure 5f) shows diffused lattice fringes, with an interplanar distance of 0.34 nm corresponding to the (101) d spacing of anatase TiO2, confirming its nanocrystalline nature. Furthermore, it is clearly seen that the BiOCl has grown into close contact with the TiO2 matrix, providing a tightly packed heterojunction structure.