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Characterization of gold nanoparticles (AuNPs). (A) Transmission electron microscopy (TEM) images of AuNPs at sizes of 25, 40, 60, and 80 nm; (B) Normalized UV-Vis spectra of AuNPs at different sizes; (C) surface-enhanced Raman scattering/spectroscopy (SERS) spectra of Raman reporter 5,5′-dithiobis-(2-nitrobenzoic acid) (DTNB) on AuNPs at different sizes (25, 40, 60, and 80 nm).
