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UV–vis diffuse reflectance spectra of (a) anatase TiO2 and (b) nanostructured rGO/TiO2. Inset: plot of transformed KM function [F(R).hv]1/2 vs. hv for bandgap determination of anatase TiO2 and rGO/TiO2; R is reflectance and hv is photon energy. Reproduced with permission from [146]. Copyright Springer, 2013.
