Bipolar Pulsed Electrical Discharge for Synthesis of Tungsten Nanoparticles in the Aqueous Solutions

The liquid phase plasma reduction method was applied to prepare the tungsten nanoparticles from the solution of tungsten chloride using bipolar pulsed electrical discharge system. The liquid phase plasma provides extremely rapid reactions caused by activated chemical species. The OH radicals produce H₂O₂ and the hydrogen radicals are used for the reduction process to generate W nanoparticles. While spherical tungsten nanoparticles were mostly observed, triangular and hexagonal-shaped nanoparticles were also observed occasionally in the plasma treated reactant solution. The anionic surfactant of SDS was shown to exhibit a large influence on the particle generation procedure.