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UV absorption spectrum of different samples: a pure MWNT, b MWNTs/ZnO composite annealed at 450 °C, c MWNTs/Cu-doped ZnO composite annealed at 450 °C, d MWNTs/Cu-dopedZnO composite annealed at 550 °C, and e MWNTs/Cu-doped ZnO composite annealed at 650 °C
