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Characterization of NIR-emitting PEGylated AuNPs (PEG-AuNPs). a) Scheme of the particle synthesis. b) Typical TEM image of the synthesized PEG-AuNPs. c) The core size measured by TEM, and hydrodynamic diameter (HD) of PEG-AuNPs in PBS measured by dynamic light scattering (DLS). d) Absorption and luminescent spectra of PEG-AuNPs in PBS at pH 7.4.
