Preparation of silver nanopowders by a controlled wet-chemical synthesis

The synthesis of silver nanopowders prepared by the method of controlled wet-chemical reduction is reported. The effects of mixture ventilation of NO2 and O2 in process of silver nanopowders are investigated. It is found that the morphology and tap density of silver nanopowders can be influenced by the ventilation volume in the process. The ventilation effects are discussed on the basis of the aggregative growth theory. It is reasonable to speculate that ventilation has two effects on the silver nanopowders. On the one hand, ventilation chemically promotes the incorporation of silver nuclei, on another hand, the shearing action of ventilated gases physically improves the final tap density of nanopowders.