以硫酸铜为原料制备纳米级铜粉,再用化学还原法沉积生长Ag包覆层,制备Cu/Ag复合纳米粒子,使用紫外吸收光谱法监测反应过程。结果表明,加料方式对Cu粒子的粒径会产生影响,向水合肼中滴加聚乙烯吡咯烷铜与硫酸铜的混合液能制得粒径均匀的铜纳米粒子。同时,使用向聚乙烯吡咯烷铜与硫酸铜的混合液中滴加水合肼方法制得Cu2O继而得到铜纳米粒子,能制备出稳定的Cu/Ag复合纳米粒子。 Copper sulfate was used as raw material to prepare nano-scale copper powder, then chemical reduction method was used to deposit and grow Ag coating to prepare Cu / Ag composite nano-particles, and the reaction process was monitored by UV absorption spectroscopy. The results show that the particle size of Cu particles will be affected by the feeding method. Copper nanoparticles with uniform particle size can be obtained by adding a mixture of polyvinylpyrrolidone and copper sulfate to hydrazine hydrate. In the meantime, Cu2O was prepared by adding hydrazine hydrate dropwise to a mixture of polyvinylpyrrolidone and copper sulfate to obtain copper nano-particles, thereby preparing stable Cu / Ag composite nano-particles.