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Characterization of different sized gold nanoparticles (AuNPs). (A) Transmission electron microscopy (TEM) images of AuNPs with diameters of 5 nm, 20 nm or 50 nm. The scale bar is 20 nm. (B) UV–vis absorption spectra of different sized AuNPs in 0.1 Mm PBS. UV–vis spectra of 5-nm AuNPs (C), 20-nm AuNPs (D) and 50-nm AuNPs (E) in cell culture medium with 10% FBS.
