Synthesis of gold, platinum, and gold-platinum alloy nanoparticle colloids with high-power megahertz-repetition-rate lasers: the importance of the beam guidance method

Abstract Nanoparticles of noble metals and their alloys are particular interest for biomedicine catalysis applications. The method laser ablation bulk in liquids gives facile access to such particles as high-purity colloids is already used industrial research. However, the still lacks sufficient productivity implementation into series production. use innovative technology may help further disseminate this colloid synthesis near future. Ultrashort-pulsed lasers with high powers megahertz-repetition-rates became available recently, but place demands on accurate optical pulse delivery target. Full lateral separation necessary avoid a reduction nanoparticle due shielding. In study, we compare flexible rather slow galvanometer scanning much faster more expensive polygon-wheel performance production colloidal nanoparticles by liquid. Both beam guidance technologies applied gold, platinum, gold-rich platinum alloy micromolar saline water. We found that dimensions scan pattern crucial. A threshold length exists, at which one becomes productive than other one. addition, lower was gold compared platinum. Alloying only 10 at.% improved nearly level reaching 8.3 g/h.