二氧化硫脲还原法制备纳米铜颗粒

Preparation of Cu Nanoparticles with Thiourea Dioxide by Aqueous Reduction Method

以Cu SO4?5H2O为原料、聚乙烯吡咯烷酮为分散剂、葡萄糖和二氧化硫脲为还原剂,采用液相两步还原法制备分散性较好的球形纳米铜粉,考察了预还原步骤、二氧化硫脲与铜离子浓度配比、反应温度和反应时间对铜粉粒度、分散性和形貌的影响,表征了铜粉的特性.结果表明,较优的制备条件为:二氧化硫脲与硫酸铜溶液浓度比2:1、反应温度75℃、反应时间15 min,该条件下所制产品为粒径20～100 nm的类球形铜粉.

Dispersive nanocrystalline copper powder was prepared by two-step aqueous chemical reduction method with copper sulfate as raw material,polyvinylpyrrolidone as dispersant,and glucose and thiourea dioxide as reductive agents.The effects of prereduction,concentration ratio of thiourea dioxide to copper ion,reaction temperature and reaction time on the shape,size and size distribution of nanocrystalline copper powder were examined,and the copper powder was characterized.The results showed that the optimum conditions were obtained as the concentration ratio of thiourea dioxide to copper ion 2：1,reaction temperature 75 ℃,and reaction time 15 min.Under the conditions,the prepared Cu particles were pure spherical-shaped particles with the diameters of 20～100 nm.