Formation of Composite Nanoparticles behind Shock Waves Generated by Dual Pulsed Laser Ablation

In this study, dual pulsed laser ablation was used to prepare composite nanoparticles. Formation of composite nanoparticles was attempted by controlling the amount of time delay between the laser ablation processes, which was accomplished by imposing time delay on the pulse arrival at two different target materials. By monitoring the emission spectra of the laser plume, the relation between the time evolution of the emission spectra and the possibility of composite nanoparticle formation was investigated. In addition, numerical simulations were conducted to compare the rate of nanoparticle formation in homogeneous and heterogeneous nucleation. The results indicated that, under particular conditions in the heterogeneous nucleation, the plume emission spectra represents the time evolution and the conditions of composite nanoparticle formation by the dual laser ablation.