Synthesis of copper-based nanoparticles in water using a nanosecond pulsed laser engraver

Abstract

We demonstrate the synthesis of copper nanoparticles using a low energy high repetition rate nanosecond pulsed laser engraver. A solid copper target in distilled water was irradiated at different irradiation times and scanning speeds, and the colloidal samples were characterized using UV-Vis absorption spectroscopy, dynamic light scattering (DLS), and zeta potential measurements. Weak surface plasmon resonance of copper was demonstrated for the sample ablated for 0.5 h and 2500 mm/s, with high absorbance in the UV region characteristic of Tyndall effect, suggesting pronounced scattering by agglomerated particles. DLS showed large particle sizes with intermediate zeta potentials, showing  high likelihood for agglomeration. This preliminary study demonstrates nanoparticle synthesis for a low-cost laser engraver, and future research includes optimizing colloidal stability and controllability of particle size distribution.