Plasma-chemical formation of silver nanodispersion in water solutions

Abstract

The application of plasma discharges of different methods of generation is an innovative, environmentally safe and promising method of synthesizing silver nanodispersions. The efficiency of using the contact nonequilibrium low-temperature plasma in comparison with the conventional method of chemical reduction in solutions and photochemical deposition is investigated. Plasma-chemical synthesis of silver nanodispersions from water AgNO 3 solutions without the use of additional reducing reagents and in the presence of sodium alginate stabilizing reagent is carried out. It is found that the yield of silver nanoparticles in the plasma-chemical synthesis is 95.10–97.17 %. The obtained data are obtained by the chemical reduction method in solutions (93.9 %) and photochemical deposition (20.0 %). It is found that in the plasma-chemical synthesis of silver nanodispersions, the introduction of sodium alginate into the reaction mixture increases the yield of silver nanoparticles and allows synthesizing stable colloidal silver solutions. It is shown that the formation of silver nanodispersions under plasma discharge is characterized by the presence of the peak λ max =400–420 nm. The formation of silver nanoparticles was confirmed by the X-ray diffraction analysis. Microscopic examination (SEM) indicates that the size of the formed silver particles is up to 100 nm. The mechanism of synthesizing silver nanoparticles in the sodium alginate solution under plasma discharge is proposed. The obtained data testify to the promising application of the nonequilibrium plasma for the controlled synthesis of silver nanodispersions and the need for further research in this direction