Laser-Induced Synthesis of Palladium @ Silver Core-Shell NPs as an Effective Antibacterial Agent

Q-switched Nd:YAG laser of 1064 nm wavelength was used to synthesize Pd@Ag (core/shell) nanoparticles (NPs) using pulsed laser ablation in distilled water. The synthesized Pd@Ag core-shell NPs were characterized by UV-visible spectrophotometry, Fourier-transform infrared (FT-IR), X-ray diffraction (XRD), transmission electron microscopy (TEM), and energy-dispersive spectroscopy (EDS). UV-vis spectra clearly showed absorption peaks at around 200 and 405 nm, which are caused by surface plasmon resonance on Pd NPs and Ag NPs, respectively. X-ray diffraction analysis showed that Pd NPs and Ag NPs had a crystalline nature with face-centered cubic structure. The TEM images clearly displayed the core-spherical shell's shape of produced Pd@Ag NPs, with an average particle size ranging from 65 to 350 nm. Antibacterial activities of Pd@Ag core-shell NPs were investigated using well diffusion method. Pd@Ag core-shell NPs exhibited higher antimicrobial effect against Gram-positive pathogens than Gram-negative strain. Pd NPs, on the other hand, had no significant antibacterial activity compared to Pd@Ag core-shell NPs due to their nontoxicity. Herein, we present results demonstrating the excellent antibacterial action of PLAL-prepared Pd@Ag core-shell nanoparticles to kill microbial organisms. These characteristics distinguish this nanostructure for use in antimicrobial applications.

Automated summary

In this study, Pd@Ag(core/shell) nanoparticles were synthesized using Q-switched Nd:YAG laser at a wavelength of 1064 nm in distilled water. The synthesized nanoparticles were characterized by various techniques, including UV-visible spectrophotometry, FT-IR, XRD, TEM, and EDS. The results showed that the Pd@Ag core-shell nanoparticles exhibited excellent antibacterial activity, especially against Gram-positive pathogens. The use of PLAL-prepared Pd@Ag core-shell nanoparticles as antimicrobial agents shows promising potential.