[20p-W321-1~13] Progress in studies on laser-processing employing liquid media

[20p-W321-5] Metal and alloy nanoparticles synthesized by high-intensity laser irradiation of solution

〇Takahiro Nakamura¹, Shunichi Sato¹ (1.IMRAM, Tohoku Univ.)

Keywords:nanoparticles,femtosecond laser,solution

Tightly focused femtosecond pulsed laser can easily produce high intensity optical field as much as the Coulombic potential of the atoms. When such a laser-induced high energetic field is formed in metallic ion solution, solvated electrons and hydrogen radicals are created thorough the optical decomposition of water molecules. These transient species can act as strong reducing agents to reduce metallic ions to zero valent atoms in very short time period resulting in nanoparticles formation. We have demonstrated the formation of metal and alloy nanoparticles by high intensity laser irradiation of metallic ion solution and their mixture. In particular, formed alloy nanoparticles have all-proportional solid-solution nature which was difficult to attain by conventional methods due to the immiscible property and the different reduction potentials of metallic ions in the solution. In the presentation, experimental results and recent topics will be explained in detail.