Figure 3
Cross-section FE-SEM images of TiO2 layers deposited.
TiO2 (a) in gig-lox (∼800 nm) and (b) in ppg (∼500 nm) configurations. Layers after thermal treatment: at 200 °C 30 min in (c) gig-lox, (d) ppg layers; at 500 °C 30 s in (e) gig-lox, (f) ppg layers. The annealings were done in air. Notice how the gig-lox layer, differently from the reference, retains its deep porosity even after treatment at 500 °C.
