Figure 4From: Biomimetic one-pot synthesis of gold nanoclusters/nanoparticles for targeted tumor cellular dual-modality imagingFluorescence emission spectra. (a) Fluorescence emission spectra of tryptophan residues of pure BSA, BSA-AuCl4−, and BSA-Au nanocomplexes (λex = 280 nm). (b) Fluorescence emission spectra of BSA-Au nanocomplexes in different concentrations of BSA solution (λex = 470 nm).Back to article page