Nickel Nanoparticles Formation from Solution Plasma Using Edge-Shielded Electrode

Abstract

Abstract. Because of the easy massproduction, synthesis of metallic nanoparticles from a solution plasma is an attractive method. However, a solution plasma produces a highly inhomogeneous electric field via transition to full-plasma, and the products are partially oxidized and agglomerated, with a wide size-distribution. Here, we show a simple method of suppressing oxidation of products. An electrode tip was shield by a glass tube and a voltage of up to 180 V was applied with the electrolyte of 0.1 M NaOH solution. Significantly, the edge-shield was quite effective for maintaining partially glow discharge. The results were (1) surface temperature of the electrode less than 100 °C, (2) main phase of metallic nickel evaluated by XRD, and (3) nanoparticles of an average size of 220 nm. These results showed the potential for an application to the production of nanoparticles.

Surfactant-assisted synthesis of Sn nanoparticles via solution plasma technique

“…In this solution plasma technique [19][20] , an electrode was used as the raw material for the preparation of nanocrystals. Various nanoparticles such as Ni 19,20 , Au 20,21 , ZnO 22 have been synthesized via solution plasma.…”

“…In this solution plasma technique [19][20] , an electrode was used as the raw material for the preparation of nanocrystals. Various nanoparticles such as Ni 19,20 , Au 20,21 , ZnO 22 have been synthesized via solution plasma. In general, the solution plasma technique offers many advantages, such as (1) simple experimental setup, (2) no requirement for gas supply, (3) higher productivity than conventional solution processes, and (4) applicability to mass production.…”

Excitation temperature of a solution plasma during nanoparticle synthesis

“…As reported previously, 16,19,22,23 the experimental setup consisted of two electrodes in a glass cell with a capacity of 300 ml. The cathode consisted of a metal wire with a diameter of 1.0 mm.…”

“…14,15 Recently, a solution plasma has been applied to the synthesis of nanoparticles. The produced particle size and compositions were affected by the plasma conditions, such as the electrode shape, 16,17 voltage, 18,19 atmospheric pressure, 20 and material. 21 Previous reports indicated that the shape of the electrode affects the plasma conditions and obtained nanoparticles.…”

“…When the electrode has an edge similar to the tip of a wire, the transition from a partial-plasma region to a full-plasma region occurred with the strong emission of light. 16 This transition is caused by the current concentration at the edge induced by a highly inhomogeneous electric field. The products are oxidized and agglomerate after the transition.…”