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<table>(A) Raman spectra of pure TiO<sub>2</sub> (a), Nd-doped TiO<sub>2</sub> with Ti : Nd = 23 : 1 (b), and Nd-doped TiO<sub>2</sub> with Ti : Nd = 11 : 1 (c). (B) The enlarged peak at 144.86 cm<sup>−1</sup>.</table>

International Journal of Photoenergy

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Figure 2

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Figure 2 | Neodymium-Doped  with Anatase and Brookite Two Phases: Mechanism for Photocatalytic Activity Enhancement under Visible Light and the Role of Electron 