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(a) Fluorescence spectra of the aggregated CuNCs synthesized in the presence of various amounts of Cu2+ (0.1 M) (Cys, 0 μL; Cu1, 25 μL; Cu2, 50 μL; Cu3, 100 μL; Cu4, 150 μL; Cu5, 200 μL). (b) The corresponding aggregated CuNCs regulated by Ce3+ with the most significant enhancement (c) and the fluorescence intensity comparison for CuNCs induced by the absence and presence of Ce3+.
