Evaluation of Morphological and Optical Properties of Ag, Au, and Ag@Au Nanoparticles Synthesized via Laser Ablation

This work concentrates on Ag, Au, Au@ Ag, and Ag@ Au nanoparticles in various configurations produced through pulsed laser ablation at a wavelength of 532 nm, examining various configurations generated at different laser fluences. The characterization of the materials employs several testing methods, including photoluminescence (PL), dynamic light scattering (DLS), transmission electron microscopy (TEM), Energy-dispersive X-ray spectroscopy (EDX) and ultraviolet-visible spectroscopy (UV-Vis). The characterization results indicate that the Au@Ag and Ag@Au nanoparticles exhibit transmission absorption peaks at 500 nm and 400 nm, respectively. Meanwhile, UV-Vis spectroscopy shows peak absorption at 490 nm for Au and 400 nm for Ag. Additionally, TEM reveals average diameters of Ag, Au, Ag@ Au, and Au@ Ag core-shell nanoparticles is based on their average diameters of 14.58 nm, 18.34 nm, and Core-shell (97.31–96.35) nm, respectively. While the particle sizes of the Au NPs, Ag NPs, Ag@ Au, and Au@ Ag measured using DLS were 82 nm, 57.3 nm, 204.6 nm, and 156.8 nm respectively.