Figure 4.

UV–vis DRS of pure TiO2 (a), CNTs (b) and TiO2 NPs-coated CNTs synthesized with CNTs/TiO2 molar ratio of 1/4 (c), 1/2 (d), 1/1 (e), 2/1 (f), and 4/1 (g)

Xie et al. Nanoscale Research Letters 2009 5:603-607   doi:10.1007/s11671-009-9513-5