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(a) photographs of pristine Bi4Ti3O12 and various colored Bi4Ti3O12−x; (b) UV-Vis absorption spectrum of the pristine Bi4Ti3O12 and various Bi4Ti3O12−x; (c) plot of the transformed Kubelka-Munk function (F(R∞)) versus the photon energy (hv) for various Bi4Ti3O12−x and the pristine Bi4Ti3O12 nanosheets.
