Preparation and application of sliver nanoparticles by chemical method

The silver nanoparticles are prepared by chemical reduction method in aqueous solutions using silver nitrate as a source of silver. The effects of the concentration of reactants,the amount of surfactant and temperature on morphology and size of silver nanoparticles are studied. The silver colloids with an average size of 80 nm are obtained by using 1. 2 g of PVP and high concentration( 30 g / L) of Ag NO3 at room temperature. Their thermal behavior and conductivity are also discussed. The results show that the conductivity increases with the increase of silver sol concentration. Silver colloids obtained have no residual inorganics and can be directly used as conductive ink,which effectively avoids the reduction of silver particles in the centrifuge process and the second surface modification of silver nanoparticles.