Figure 7.

Optical absorption (a) and diffuse reflectance spectra (b) of 3D TiO2structures. Structures synthesized with various acid conditions: 0.68 M HCl, 0.90 M HCl, 1.12 M HCl, 1.35 M HCl, 0.90 HNO3, and 0.90 M HAc, respectively.

Zhou et al. Nanoscale Research Letters 2012 7:217   doi:10.1186/1556-276X-7-217
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