Figure 3.

Number size distribution histograms for commercial PEG-coated 30 nm AuNPs (A), PVP-coated 60 nm AuNPs (B), and citrate-coated 100 nm AuNPs (C) measured by TEM (provided by the manufacturer) (purple),³⁴ HR-SEM (dark red),³² and spICP-MS (green).³² Vertical black dashed lines indicate mean particle diameters. Adapted from ref 32. PNC_distribution values calculated using in-house Au mass fractions and PSD reported by TEM,³⁴ HR-SEM,³² and spICP-MS³² are depicted in the table. Listed uncertainties correspond to U95% C.I. Relative differences between PNC_distribution and PNC_mean are shown in parentheses.