Sol-Gel to Prepare Nitrogen Doped TiO₂ Nanocrystals with Exposed {001} Facets and High Visible-Light Photocatalytic Performance

Figure 3

The XPS survey scan patterns of samples ((a) S2 and S2-500; (b) N 1s of S2; (c) N 1s of S2-500).

(a)

(b)

(c)