Preparation of Sliver Nanoparticles by Liquid Chemical Reduction Method

Abstract

The development of printing electronics technology promotes the application of conductive ink, and nano-silver conductive ink is a hot research. Sliver particles are the main conductive component in conductive ink, so nano-silver particles are very important for the ink conductivity. In this paper, silver nanoparticles were reduced from silver nitrate solution by liquid chemical reduction method, with Sodium hypophosphite as reductant, PVP as surface-protection reagent, and sodium hexametaphosphate as dispersant. Orthogonal test with 4 factors and 3 levels is designed in which the effect of reducing agent dosage, protective agent dosage, dispersant content and reaction temperature on the nano-particle size and morphology of silver is investigated. The size distribution of nano-silver powder is measured by nano-size potential analyzer, and the morphology of silver particles is characterized with the SEM. The experiment results showed that the minimum average size of sliver particles can reach 23.87nm, and the dispersed spherical nano-particles with the average size is about 60nm can be obtained.