Photocatalytic Activity of Toluene under UV-LED Light with TiO₂ Thin Films

Figure 4

2D AFM images of TiO₂ thin films on stainless steel substrate: (a) TiO₂; (b) 0.3% Fe-TiO₂; (c) 0.5% Fe-TiO₂; (d) 0.7% Fe-TiO₂.

(a)

(b)

(c)

(d)