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Effect of Laser Wavelength at IR (1064 nm) and UV (193 nm) on the Structural Formation of Palladium Nanoparticles in Deionized Water

In this work, Pd nanoparticles were synthesized by pulsed nanosecond laser ablation in deionized water using Q-switched Nd:YAG and ArF excimer lasers, independently. The aim is to investigate the wavelength dependence of nanoparticle formation mechanisms using IR and UV laser irradiations. Pd nanoparticles fabricated by a Q-switched Nd:YAG laser show a perfect spherical morphology, whereas those due to the ArF excimer laser undergo fragmental shapes. Furthermore, the production rate of Pd nanoparticles generated at IR is noticeably greater than that at UV wavelength. Moreover, the plasma temperature induced by the Nd:YAG laser is higher than that generated by the ArF laser mainly due to the stronger inverse Bremsstrahlung process at the IR region. It was shown that the ArF laser fabricates palladium oxide structure with much higher rate with respect to the Nd:YAG laser.