Abstract:Flower-like silver nanoparticles were prepared with PVP as reductant under conventional heating conditions after investigation on the effects of reaction temperature, reaction time, molar ratio of PVP/AgNO3, and stirring speed on silver nanoparticles. The results show that flower-like nano silver particles with uniform distribution and thickness of about 20~60 nm can be prepared under the conditions including temperature of 80 ℃, PVP/AgNO3 molar ratio of 5︰1, and reaction time of 24 h. Temperature is the key factor affecting morphology and structure of silver nanoparticles. Size of silver nanoparticles rises upon increase of reaction temperature, and its morphology gradually transforms from regular spherical to lamellar structure. PVP molecules covering on surface of silver nanoparticles induce a directional growth of crystals to some extent, leading to different growth rate of silver nanoparticles along all directions, and a clear flower-like structure finally comes into shape.