Fig. 3From: Hydrothermal derived nitrogen doped SrTiO3 for efficient visible light driven photocatalytic reduction of chromium(VI)XPS spectra of pure and nitrogen doped SrTiO3 samples: the whole scanning spectra (a) and the high resolution regional spectra of Ti 2p (b), O 1 s (c), and N 1 s (d)Back to article page