Figure 6.

Optical absorbance spectra (a1-c1) of the α-Fe2O3 with different morphologies (a2-c2). Time (h) = 12.0; Temperature (°C) = 120 (a1, a2, b1, b2), 150 (c1, c2); FeCl3/H3BO3/NaOH = 2:3:6 (a1, a2), 2:3:4 (b1, b2, c1, c2).

Zhu et al. Nanoscale Research Letters 2013 8:2   doi:10.1186/1556-276X-8-2
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