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Comparison of the UV-vis extinction spectra of as-prepared dialyzed AuNPs before and after the Ag+-staining for AuNPs with particle size of (A) 13 nm, (B) 30 nm, and (C) 50 nm. (D) Bar plot showing the percentage increase in the AuNP peak UV-vis intensity induced by Ag+-staining as a function of AuNPs size.
