Preparation of Hexagonal-Boron Nitride Nanoparticles by Laser Ablation in Liquid and their Properties

Hexagonal boron nitride nanoparticles were successfully prepared by laser ablation in liquid. A nanosecond laser at the second harmonic of Nd:YAG was used for the preparation, and they were evaluated by scanning electron microscopy, X-ray diffraction, and dynamic light scattering. Increasing the laser fluence reduced the secondary particle size, yielding particles of 379 nm. The high-temperature laser process did not cause any phase change, and hexagonal boron nitride nanoparticles were obtained. Decreasing the amount of sodium hydroxide solution added to the solvent of laser ablation reduced the amount of agglomeration and reduced the secondary particle size, yielding nanoparticles of 189 nm. The zeta potential of the prepared nanoparticle was-62 mV and the primary particle diameter was 25 nm.