Effect of Solvents on the Synthesis of Silver Colloidal Nanoparticles by Electromagnetic Wave Method

Recently, rapid heating by microwave has been known as a significant technique for the synthesis of metal nanostructures. In this study, in order to process of silver nanoparticles from silver nitrate (AgNO3) as pre material, polyvinyl Payrolyden (PVP) as a stabilizer and water, ethylene glycol and ethanol as solvent at a temperature 25 °C were used. At first, solution with certain ratios of AgNO3 and PVP were prepared and the reaction between solvents was carried out during 90 s. During the chemical reaction between solvents, electromagnetic waves with the fixed intensity and frequency 2450 MHz were applied to the system by the microwave oven. Then intensely silver nanoparticles in the solution were obtained as a result of chemical reactions. To determine particle size distribution and concentration, the prepared nanoparticles were investigated by analysis visible spectroscopy (UV-VIS). The transmission electron microscopy (TEM) micrographs showed that the processed nanoparticles have spherical and semi-spherical morphology and size distribution of spherical particles is in the range of 10 to 40 nm. The prepared silver nanostructures show less crystallization degree and smaller particle size than the oil bath conventional methods.