Preparation and Characterization of Silver Nanopowders

Silver nanopowders were synthesized by chemical reduction method at room temperature.The product was characterized by x-ray diffraction(XRD),transmission electron microscopy(TEM),FT-IR spectrum,thermogravimetric analysis(TGA)and differential scanning calorimetry(DSC).The experimental results showed that the Ag nanoparticles are in high dispersion state with uniformly quasi-spherical shapes,the average particle size is about 26nm with a narrow size distribution ranging from 10nm to 50nm.It is also found that the crystal structure of the Ag nanopowders is the same as the bulk materials,namely fcc structure and that the nanopowders have strong adsorption property.