Preparation of TiO₂ Nanotube Array on the Pure Titanium Surface by Anodization Method and Its Hydrophilicity

Figure 3

XRD patterns of the nanotube array obtained by anodization at 20 V for 6 h after with annealed at different temperatures: (a) as-prepared, (b) 450°C, (c) 550°C, and (d) 650°C.