Figure 1From: Study on the visible-light-induced photokilling effect of nitrogen-doped TiO2 nanoparticles on cancer cells 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.Back to article page