高纯纳米银溶胶的绿色合成——电解法(英文)

Green Synthesis of Highly Pure Nano-Silver Sols—Electrolysis

以两高纯银片作电极,以去离子水为电解液,PVP作为辅助电解质和稳定剂,通过电解法制备了高纯纳米银溶胶。探讨了PVP含量、电解时间、电流密度对形成的纳米银溶胶的影响。结果表明:当PVP质量分数为5%、电解150min、电流密度为1～2mA/cm2时,所得球形银粒子的粒径1～3nm、单分散,浓度达130μg/g,而且有极好的存放稳定性,室温避光存放6个月无任何可见的变化。

The highly pure nano-silver sols were prepared by an electrolysis method using two highly pure silver flakes as electrodes and deionized water as electrolytic solution, and PVP served as stabilizer. The effects of PVP content, electrolytic time and current density on the colloidal silver nanoparticles were researched. The results indicate that as-synthesized particles were spherical about 1~3 nm in size, and monodispersed and its concentration reached to 130 μg/g under the condition of 5.0 wt% PVP with current density about 1~2 mA/cm2 for 150 min. Moreover, the nano-silver sol had such an excellent stability that it had not any change though it was placed in dark at room temperature for 6 months.