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Characterization of colloidal gold nanoparticles. (a) TEM image shows the AuNPs of spheric shape with a core size of 25.4 ± 6.1 nm, (b) The colloidal AuNPs solution has an absorption band at λmax = 523 nm in the UV-vis spectrum, (c) The citrate-encapsulated AuNPs have a mean diameter of 52.9 ± 27 nm in DLS analysis, and (d) The colloidal AuNPs solution shows zeta potential of −41.7 mV at pH 2.5 and electrical conductivity of 1.342 mS/cm.
