Figure 2.

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

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