Obtaining solutions of silver nanoparti-cles under plasma discharge

Abstract

The paper considers obtaining water solutions of silver nanoparticles with contact non-equilibrium low tem-perature plasma discharge. The aim of the work is to study the influence current of a discharge non-equilibrium low-temperature plasma on the composition of silver nanoparticles solutions. The investigations were carried out in a gas-liquid batch reactor the volume of which 100 ml. The reactor pressure was 80±4 kPa. The current was maintained at 120±6 mA. The time of treatment was from 10 seconds till 14 minutes. The solutions were prepared by dissolving the argentums nitrate in distilled water with a predetermined ratio. Oxidation-reduction potential was measurement 30 seconds after stopping the treatment of solutions of CNP using an ionometr I–160MI. Optical spectra of sols were recorded on the spectrophotometer UV-5800PC in the wavelength range 190…700 nm. Micrographs of nanoparticles were obtained with a scanning electron microscope REM-106I with magnification of 100…2000 times. Additional particle size analysis was performed by dynamic light scattering on a VASCO instrument (laser wavelength 658 nm). It is found, the сurrent strength in the circuit is influence to the yield of oxidized compounds and the desired product. The regularities of the change in the oxidation-reduction potential of aqueous solutions of argentum nitrate are studied depending on the concentration of AgNO3, the time of action plasma discharge and amperage. Morphological and dimensional characteristics of plasmochemical obtaining silver nanoparticles were researched. It is found the dispersion phase of nano-particles witch produced in results action of plasma discharge has size up to 50 nm and spherical form. If the amperage is growing it will produce the bigger particles.

Keywords

• solution of silver nanoparticles
• plasma discharge
• amperage