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

[20p-W321-11] Hydrophilic Carbon Nanoparticle Generation from Liquid Phase by Femtosecond Laser Induced Plasma

〇Tomoyuki Yatsuhashi¹ (1.Osaka City Univ.)

Keywords:filament,benzene,elemental composition

Focusing intense femtosecond laser pulses onto water creates a high density of reactive species such as hydroxyl radicals in a well-confined volume; i.e., plasma filament. We synthesized hydrophilic and hydrophobic carbon nanoparticles (CNPs) by femtosecond laser irradiation of the water layer of an aerated organic/water (O/W) bilayer solution. The properties of the particle surface were controlled simply by adjusting the laser focusing position, the duration between the preparation of O/W bilayer solution and the laser irradiation. Our new technique to produce CNPs with different surface character does not require heating, acid treatment, or a surfactant. In addition, the elemental composition could possibly be controlled by selecting reactants by using this method.