Rapid Formation of 1D Titanate Nanotubes Using Alkaline Hydrothermal Treatment and Its Photocatalytic Performance

Figure 6

Raman spectrum of hydrothermal formation of nanotubes with different reaction duration: (a) 3 h, (b) 6 h, (c) 9 h, (d) 21 h, and (e) 24 h.