Figure 2

SEM images of TiO₂1D nanostructures synthesized at different conditions. Illustration of the effect of catalytic materials: the nanostructures were synthesized without (a) and with (b) catalytic material Ni at 850 °C for 60 min. Illustration of the effect of reaction temperatures: the nanostructures were synthesized at 750 °C (c) and 1050 °C (d) for 60 min. Illustration of the effect of reaction time: the nanostructures were synthesized at 950 °C for 15 min (e) and 120 min (f). Insets are low magnification images of as-synthesized nanostructures on Ti grids