Collinear Double Pulse Laser Ablation in water for the production of Silver nanoparticles

Experiments of collinear Double Pulse Laser Ablation in Liquid (DP-LAL) were carried out for studying the production mechanisms of nanoparticles (NPs) in water, which revealed the fundamental role of the cavitation bubble dynamics in nucleation and aggregation processes of nanoparticles formed in solution. 10 In this work, DP-LAL was used to generate silver nanoparticles (AgNPs) from silver target submerged in water at atmospheric pressure and room temperature, by using the second harmonic (532 nm) of two Nd:YAG lasers. The two pulses were shot with different delay times (i.e. interpulse delay) during the bubble temporal evolution of the first laser induced bubble. Optical Emission Spectroscopy, Shadowgraph Images, Surface Plasmon Resonance absorption spectroscopy and Dynamic Light 15 Scattering were carried out to study the behaviour of laser-induced plasma and cavitation bubble during the laser ablation in liquid, to monitor the generation of AgNPs in different conditions, and for NPs characterization. The results of DP-LAL were always compared with the corresponding ones obtained with Single Pulse Laser Ablation in Liquid (SP-LAL), so as to highlight the peculiarities of the two different techniques