Synthesis of silicon nanoparticles by picosecond laser ablation in liquid

D.M. Popovic
University of Belgrade-Faculty of Physics, RS

Keywords: silicon nanoparticles, laser ablation in liquid, picosecond laser

Summary:

The one of the most promising method for the producing of silicon-based NPs is the laser ablation of solid target in liquid (LAL), because it’s relatively simple, fast and “green”. In this work we produced Si NPs by irradiating a single crystal silicon target in de-ionized water with Nd:YAG laser at wavelengths of 1064 nm. The effect of the laser pulse energies on particle size distribution was analyzed. The main goal of our work was to at least partially enlight the role of thermal effects, such as warming of the target, on the LAL process. To acchieve it, we provide additional heating of the target surface by applying the additional continuous laser during the experiment. In attempt to minimize the heating of the water, we used the green laser. The both laser spots, continual and pulsed, were placed at a fixed position in the centre of the silicon target. The shift of NPs size distribution caused by applying of additional continuous laser was reported in this work. An analysis of correlation between heating of the LAL target and the NPs size distribution could be used for partially controlling the LAL process.