Additional file 2: Figure S2.

The transmission spectrum of the 400 to 440 nm bandpass filter. Description: The filter could transmit some light with the wavelength below 400 nm, which could be absorbed by the pure TiO2 as shown in Additional file 1: Figure S1.

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Li et al. Nanoscale Research Letters 2013 8:96   doi:10.1186/1556-276X-8-96