Laser ablation of gold and titanium targets in heavy water

Abstract

The synthesis of gold and titanium (OT4-0) nanoparticles by laser ablation in D2O and H2O using the radiation of an Nd: YAG laser with a wavelength λ = 1064 nm is considered. The influence of a liquid absorption capacity in which laser radiation interacts with a target on laser ablation products is studied. In the case of ablation in heavy water, the optical density of nanoparticles colloids was increased in comparison with the optical density of colloids obtained with the same parameters, but in the H2O medium. Also, when D2O was used, the absorption bands of the particles were shifted to the long-wavelength region of the spectrum by ~ 15 nm. SEM - analysis of synthesized nanoparticles by laser ablation in H2O and D2O media revealed the formation of dense aggregates. SEM - surface analysis of targets after treatment in both heavy and H2O water showed the formation of structures with a transverse dimension of the order 2 μm. Also, according to the energy dispersive analysis, when irradiating in H2O and D2O, an oxide layer of the same thickness was formed on the targets surface. The same morphology of laser-modified surfaces also leads to the equality of their conductive properties. The measurements of the current-voltage characteristics recorded the S-shaped behavior of the curves, which can be explained by the manifestation of the memristor properties of the modified titanium target surface coated with an oxide layer.