球形纳米银粉的制备研究

Research on Preparation of Spherical Nanosized Silvery Powder

在较高浓度的硝酸银溶液中，采用水合肼为还原剂，PVP为保护剂的化学还原法制备了纳米银粉。通过对还原剂、保护剂用量和硝酸银浓度、温度、还原剂的加入方式、pH值等因素对纳米银粉粒度和形貌影响的考察，获得了制备纳米银粉的工艺。在AgNO3浓度为0．6mol／L，PVP／Ag摩尔比为1．5，水合肼浓度为0．6mol／L，pH值为5～6，温度为60℃的条件下，制备出了粒度均匀且粒度在50nm左右的纳米银粉。

Using hydrazine hydrate as reducing agent, polyvinyl prorrolidone as protecting agent, the nanosized silver powder was synthesized by the chemical reduction method in a higher concentrated silvery nitrate solution. The preparation process of the nanosized silver powder was obtained through the study of the effects of the following factors such as the doses of reducing agent and protecting agent, the concentration of silver nitrate, temperature, the way to add reducing agent, pH value etc. on the particle size of the nanosized silvery powder and its morphology. The nanosized silver powder with the diameters of about 50 nm and homogeneous particle size distribution was prepared under the conditions of AgNO3 concentration with 0.6 mol/L, PVP/ AgNO3 mole ratio with 1.5, hydrazine hydrate concentration with 0.6 mol/L, pH=5-6 and 60℃.