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Fluorescence spectra of the solutions containing AuNC-S-PEG-FITC after the AuNCs had been dissolved with a KCN-based etchant: AuNC-S-PEG3000-FITC (10 pM, red curve), AuNC-S-PEG5000-FITC (10 pM, blue curve), AuNC-S-PEG20000-FITC (20 pM, green curve) and the pristine AuNC (20 pM, black curve).
