Synthesis of Monodisperse Silver Nanoparticles by Wet-chemical Reduction Method

Silver nanoparticles with narrow distribution were prepared by a simple route in water in presence of lauric acid as the capping agents,hydrazine hydrate as reducing agents,and silver ammonia as silver source.The morphology and crystal structure of the as-synthesised silver nanoparticles were analyzed by transmission electron microscopy and X-ray powder diffraction.The mass ratio of lauric acid to silver nitrate,and the reacion temperature had great effect on the morphology and size of the silver nanoparticles.Well-dispersed silver nanopartilces with an average diameter of 8 nm were obtained when the mass ratio of lauric acid to silver nitrate was 1.2∶1 and the reacion temperature was room temperature.UV-vis spectra also confirmed that the silver particles were monodisperse silver nanoparticles.