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(a) Absorption spectra; a: CPNs; b: CPNs and melamine; c: AuNPs; d: AuNPs and CPNs; e: AuNPs and melamine; f: mixture of CPNs, AuNPs and melamine; (b) fluorescence spectra; a’: CPNs; b’: CPNs and melamine; c’: AuNPs and CPNs; d’: mixture of CPNs, AuNPs and melamine; CPNs: 0.187 μM; AuNPs: 2.37 nM; melamine: 0.8 μM.
