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(a) Fluorescence emission spectra of Cu-doped AuNCs in PBS (pH = 7.4) at different Cu-doping ratio. (b) Fluorescence emission spectra of Cu-doped AuNCs (1%) in PBS (pH = 7.4) at different days. (c) Fluorescence emission spectra of Cu-doped AuNCs (1%) in different solvents after 24 h incubation. (d) Photo-stability of AuNCs and Cu-doped AuNCs (1%) by compared with and Rhodamine 6G.
