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DLS intensity distributions of Au and Ag nanoparticles before (black) and after (red) functionalization with FITC. (a) AuNPs-cit-l-cys (199 ± 24 nm -242 ± 21) and (b) AgNPs-cit-l-cys (141 ± 31 nm – 219 ± 18). (c) AuNPs-PEG (102 ± 7 nm -446 ± 73 nm). (d) AuNPs-PEG (267 nm -76 ± 6 nm).
