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Characterization of AuNPs. (A–C) Visual appearance of samples; (D–F) UV-visible spectra of bare AuNPsp, AuNPst, AuNPr (continuous line) and PEG-functionalized AuNPs, AuNPsp-PEG, AuNPst-PEG, and AuNPr-PEG (dashed line); (G–I) TEM imaging shows the morphology of the AuNPs; (J–L) The DLS peaks of AuNPsp-PEG, AuNPst-PEG, and AuNPr-PEG. AuNPsp-PEG, PEGylated spherical gold nanoparticles; AuNPst-PEG, PEGylated gold nanostars; AuNPr-PEG, PEGylated gold nanorods.
