Photocatalytic Properties of Nitrogen-Doped Bi₁₂TiO₂₀ Synthesized by Urea Addition Sol-Gel Method

Figure 2

Morphologies of annealed undoped and nitrogen-doped Bi₁₂TiO₂₀ micro- and nano crystals observed by SEM: (a) Bi₁₂TiO₂₀; (b) Bi₁₂TiO_20−𝑥N_𝑥(𝑥=0.01); (c) Bi₁₂TiO_20−𝑦N_𝑦(𝑦=0.03); (d) Bi₁₂TiO_20−𝑧N_𝑧(𝑧=0.06).

(a)

(b)

(c)

(d)