Synthesis of Ag microparticles by directly heat-decomposing the composite of AgNO_3 and polyvinyl pyrrolidone (PVP)

The micron silver was synthesized by directly calcining the composite of PVP and AgNO3at 573 K.IR spectra of the mixture of AgNO3and PVP were investigated in different mass ratios.The results showed that there are obvious interaction between AgNO3and the carbonyl(C = O) of PVP.With the content of AgNO3increasing,the carbonyl bands of PVP are red-shifted gradually.By calcining pure AgNO3and the mixture of AgNO3and PVP in different mass ratios at 573 K,Ag can be produced by calcining the mixture of AgNO3and PVP at 573 K while not by calcining pure AgNO3at the same temperature,which indicates that PVP plays an important role in the process of decomposing AgNO3to produce Ag.We propose that the interaction of coordination between AgNO3and the carbonyl(C = O) of PVP can reduce the decomposition temperature.