The selected area electron diffraction
(SAED) pattern acquired from an individual BiOCl nanoplate
(Figure 5d) shows a regular and clear square diffraction spot
array with lattice spacings matching those of (113) and (012)
planes, demonstrating the existence of the BiOCl tetragonal
structure, which, in turn, is in agreement with the XRD results.
The 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.