Template-Free Preparation and Photocatalytic and Photoluminescent Properties of Brookite TiO₂ Hollow Spheres

Figure 3

(a) TG-DTA curves, (b) FT-IR spectrum, and (c) UV-visible diffusion reflectance spectrum. Insert shows the energy dependence of for the sample. (d) XPS survey spectrum and high-resolution XPS spectrum for O 1s (e) and Ti 2p (f) of the sample.

(a)

(b)

(c)

(d)

(e)

(f)