Figure 1.

Raman and UV/Vis diffuse reflectance spectra of the nanoparticle samples. (a) Raman spectra of the pure and the three N-TiO2 nanoparticle samples. (b) Diffuse reflectance absorption spectra of samples pure, N-550-1, and N-550-2. Sample N-550-2 exhibited the highest absorbance in the visible region.

Li et al. Nanoscale Research Letters 2011 6:356   doi:10.1186/1556-276X-6-356
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