Additional file 1: Figure S1.
Absorbance spectra of TiO2 and N-TiO2 nanoparticles. Description: A shoulder was observed at the edge of the absorption spectra, which extended the absorption of N-TiO2 from 380 nm to 550 nm.
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Li et al. Nanoscale Research Letters 2013 8:96 doi:10.1186/1556-276X-8-96