Nanostructured CeO₂ Thin Films Prepared by the Sol-Gel Dip-Coating Method with Anomalous Behavior of Crystallite Size and Bandgap

Figure 4

Micrographs of the thickness (the white bar in the images is 100 nm) of the CeO₂ films annealed at 450 (a) and 550°C (b).

(a)

(b)