Emission Spectroscopy of Induced Plasma of Au and Ag NPs Prepared by Laser Ablation in liquids

Abstract

In this study, gold and silver nanoparticles (AuNPs, and AgNPs) were prepared by laser ablation in water using Nd:YAG laser at wavelength is 1064 nm, 1Hz frequency . The prepared nanoparticles were deposited on a silicon wafer of (100) direction by dip coating technique. The FE-SEM results showed the nanoparticles that the spherical shapes with the average size (13.9, 12.09) nm and The structural properties were identified using the XRD results were showed the crystal size that were (10.9, 12.1) nm for each of the Au NPs, Ag NPs, respectively. The plasma parameters were studied from the emission spectra such as temperature, Debye length, and electron density, and there were some differences between the bulk target and the nano-enhanced target. The results showed some differences in the peaks of atomic transitions in terms of intensity. The variation in the mechanism of laser-matter interaction with exist of the nanoparticles causes to enhances the emission line more than two folds. The generation mechanism of seeds electron may reduce the breakdown threshold, so increase the intensity of characteristics lines and enhance the LIBS detectability, especially for the wavelength range from 400 to 550 nm. Both plasma number density and plasma temperature increased nano-enhanced plasma by AuNPs or AgNPs compared with the bare surface. It is possible to benefit from the improvement in some optoelectronic applications.