Synthesis of Ag Microparticles by Direct Heat-Decomposing the Composite of AgNO_3 and Polyvinyl Pyrrolidone(PVP)

【摘要】：正Soft and milk-white silver with micron size was synthesized by direct calcining the composite of PVP and AgNO_3 at 573 K.IR spectra of the mixture of AgNO_3 and PVP were investigated in different mass ratio.The results showed that the there existed obvious interaction between AgNO_3 and the carbonyl (C=O ) of PVP.With the content of AgNO_3 increasing,the carbonyl bands of PVP were red-shifted gradually. By calcining pure AgNO_3 or the mixture of AgNO_3 and PVP in different mass ratio at 573 K,Ag could be produced by calcining the mixture of AgNO_3 and PVP at 573 K while not by calcining pure AgNO_3 at the same temperature,which indicated that PVP playede an important role in the process of decomposing AgNO_3 to produce Ag.The authors proposed that the interaction of coordination between AgNO_3 and the carbonyl (C=O ) of PVP can reduce the decomposition temperature.