Figure 3.

SEM images of cross-sections and surface annealings. Cross-section (a) and surface (b) of the porous TiO2/compact TiO2/FTO/glass, the cross-section (c) and surface (d) of Se-coated porous TiO2 before annealing, and the cross-section (e) and surface (f) of Se-coated porous TiO2 after annealing at 200°C for 3 min.

Nguyen et al. Nanoscale Research Letters 2013 8:8   doi:10.1186/1556-276X-8-8
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