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(a) UV–Visible absorption spectra of Ti3C2-MXene nanosheets, Ti3C2-MXene/NiO, and Ti3C2-MXene/NiO/CsPbI3 composites and Tauc plot of (b) Ti3C2-MXene nanosheets, (c) Ti3C2-MXene/NiO, and (d) Ti3C2-MXene/NiO/CsPbI3 composites from UV–Visible absorption spectroscopy.
