Preparation and Characterization of Silver Nanoparticles by Using Polyvinylpyrrolidone as Stabilizer

Silver nanoparticles were synthesized by using polyvinylpyrrolidone (PVP) as macromolecular surfactant,ethanol as solvent and reductant,AgNO3 as precursor. The optical properties and morphology for the synthesized silver nanoparticles were characterized by UV-Vis absorption spectroscopy and TEM (transmission electron microscopy). The results show that PVP can act as a better stabilizer for the formation of silver nanoparticles in ethanol. The obtained silver nanoparticles can give an apparent surface plasmon aborption peaks in range 400 nm～410 nm for silver nanoparticles and the absorption strength of silver nanoparticles increases as the increase of AgNO3 concentration and reaction time. Transmission electron microscopy (TEM) results show that the silver nanoparticles appear spherical morphology with a narrow size distribution. Different sizes of silver nanoparticles can be obtained by changing the molar ratio between PVP and AgNO3.