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Characterization of gold nanoparticles (GNPs). (a-b) SEM images of GNPs of diameter 17 and 46 nm, respectively. (c) Hydrodynamic diameter, ζ potential, and UV peak wavelength of polyethylene glycol and RGD peptide modified GNPs. (d-e) Dark-field and hyperspectral imaging spectra of 17 and 46 nm GNPs, respectively. (f-g) Reflectance spectra collected bright spots the HSI images in d & e, respectively.
