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Figure 3: (a) SEM image of Cu2+-TiO2 nanorods, (b) TEM image of N-TiO2 nanorods [31], (c) FESEM image of N-F-TiO2 nanorods (inset: its cross section) [32], and (d) TEM image of Au-loaded TiO2 hollow nanorods [33].