Solution plasma synthesis of Si nanoparticles

Abstract

Abstract. Silicon nanoparticles (Si-NPs) were directly synthesized from a Si bar electrode via a solution plasma. In order to produce smaller Si-NPs, the effects of different electrolytes and applied voltages on the product were investigated in the experiments detailed in this paper. The results demonstrated that the use of an acidic solution of 0.1 M HCl or HNO3 produced Si-NPs without SiO2 formation. According to the TEM and electron energy-loss spectroscopy, the obtained Si-NPs contained both amorphous and polycrystalline Si particles, among which the smaller Si-NPs tended to be amorphous. When an alkaline solution of K2CO3 was used instead, amorphous SiO2 particles were synthesized owing to the corrosion of Si in the high-temperature environment. The pH values of KCl and KNO3 increased during electrolysis, and the products were partially oxidized in the alkaline solutions. The particle size increased with an increasing applied voltage because the excitation temperature of the plasma increased.

Nanomaterial Synthesis Using Plasma Generation in Liquid

“…Si disk Molten salt i-6: Plasma-induced cathodic discharge electrolysis [43] SiO 2 particle Molten salt i-6: Plasma-induced cathodic discharge electrolysis [44] silicon wafer Ethanol i-7: microplasma-induced surface engineering [61] Si electrode LN ii-5: arc discharge (DC) [244] Si rod Solution ii-6: arc discharge (DC) [149], iii-1: solution plasma (DC) [194], iii-2: high-voltage discharge (DC) [195], and iii-3: electric discharge plasma (DC) [200] full-color displays, and optoelectronic sensors. As shown in Table 5, techniques for plasma generation in liquid have been applied to Si NP synthesis.…”

“…When a Si rod was used as an electrode to produce Si NPs in solution, the electric conductivity of Si electrode was an important factor because high-purity Si has high electric resistance. To prevent the electrode from overheating, a Si rod with an electric resistance of 0.003-0.005 Ω⋅cm was used [194,244].…”

Microfluidic chips for plasma flow chemistry: application to controlled oxidative processes

“…), ozone gener-ation [7][8][9][10][11][12] , air and water depollution (including volative organic compounds removal) 9,[13][14][15][16] or plasma-assisted combustion 17 . Meanwhile, plasmachemical synthesis has barely ventured beyond (nano-)material synthesis [18][19][20][21][22][23][24] , plasma-assisted polymerization [25][26][27] and a couple of gas-phase reactions (including benzene hydroxylation [28][29][30][31][32] and methane reforming [33][34][35][36][37] ).…”

Crystalline Evaluation of Size-Controlled Silicon and Silicon Oxide Nanoparticles Produced by Solution Plasma Discharge

“…The properties of crystalline Si particles were previously successfully controlled by manipulating the electrolytic solution composition and cell voltage. 14) Based on these results, we attempted to produce desirably sized NSiP and oxide NSiP of <10 nm and <50 nm, respectively, by controlling the electrolytic solution compositions and pH and adjusting the cell voltage. Figure 2 shows the NSiP distributions produced in different electrolytic solutions.…”