Comparison Between Silver and Gold Nanoparticles Prepared by Pulsed Laser Ablation in Distilled Water

Noble metals silver and gold nanoparticles were synthesized by pulsed laser ablation of silver and gold metal plates immersed in distilled water. In this work, the effect of the laser pulse fluence on the production of nanoparticles prepared by pulsed laser ablation is investigated. The synthesized nanoparticles are characterized by using X-ray diffraction, UV-Visible absorption spectroscopy, transmission electron microscopy, dynamic light scattering and room temperature photoluminescence. The UV-Visible absorption spectra of the nanoparticles show sharp absorptions in the visible regions due to surface plasmon resonance oscillations in noble metal nanoparticles. An enhancement in photoluminescence intensity is observed with increasing the laser fluence. It is found that all samples exhibit photoluminescence emission, at room temperature, in the UV-Visible region, due to the recombination of electrons with holes.