Synthesis and characterization of gold-silver nanoparticles in deionized water by pulsed laser ablation (PLAL) technique at different laser parameter

Abstract

Gold and silver nanoparticles (NPs) are physically synthesized using Q-switched neodymium-doped yttrium aluminum garnet (Nd:YAG)-pulsed laser ablation in liquid (PLAL) technique which is a rapid, simple and efficient one-step synthesis. The gold and silver colloidal solutions are separately prepared by 1064nm of pulsed laser ablation of metallic target (gold and silver) which is immersed in deionized water. Ultraviolet-visible spectroscopy (UV-Vis) analysis shows the absorption band of gold and silver NPs at ∼520nm and ∼400nm, respectively. The absorption spectra and color variations of gold and silver NPs at three different laser parameters (output laser energies, target distances from focal point and laser time exposures). High-resolution transmission electron microscopy shows the spherical shape of gold and silver NPs with 34nm and 33nm diameter of size, respectively, are reported. The aggregation and particle sizes of gold and silver NPs due to minimum energy (75mJ) and maximum energy (311mJ) are observed.