Figure 2.

(a) Surface plasmon resonance of wedelolactone-gold nanoparticles (WDL-AuNPs) synthesized by WDL upon reduction of AuCl₄ observed by UV–Vis spectroscopy. (b) Emission spectra of AuNPs. (c,d) DLS and Zeta potential analysis of synthesized WDL-AuNPs. Mean size distribution of WDL-AuNPs was found to be 102.7 nm. WDL-AuNPs slightly increased the negative surface charge from –10.1 mV. (e) FT-IR absorption spectra of pure WDL and WDL-functionalized AuNPs. (f) XRD patterns of the WDL-functionalized AuNPs. The XRD pattern was obtained according to four planar angles ranging from 20 to 80 at 20 peak values of 38.43°, 45.66°, 65.80°, and 78.76°, respectively, of 111, 200, 220, and 311 planes for gold.