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Characterization of AuNPs. a The size distribution of 3, 13, and 45 nm AuNPs by number. b, c The hydrodynamic diameters and zeta potentials of 3, 13, and 45 nm AuNPs (n = 3). d Photographic images and UV-vis spectra of 3, 13, and 45 nm AuNPs. e Color of 3, 13, and 45 nm AuNP solutions
