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International Journal of Photoenergy
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International Journal of Photoenergy
/
2012
/
Article
/
Fig 3
/
Review Article
Nitrogen Incorporation in TiO
2
: Does It Make a Visible Light Photo-Active Material?
Figure 3
UV-vis reflectance spectra of (a) TiO
2
, (b) P-25, (c) undoped hollow TiO
2
sphere, and (d) N-doped hollow TiO
2
sphere [
74
].