光化学还原法制备纳米银溶胶

摘要

Nano-silver sol with good dispersibility and narrow panicle size distribution was prepared by photochemical reduction of silver ammonia solution precursor with polyvinylpyrrolidone(PVP) as protective agent. Transmission electron microscope(TEM) and UV-Vis were also employed to characterize the prepared nano-silver soL The results indicate that UV irradiation time and the concentration of PVP both have obvious influence for this reaction. A good morphology and dispersibility of silver nano-sol could be synthesized after irradiation 30min, when the mole ratio of PVP/[Ag(NH3 )2]+ in reaction solution equal to 50. Furthermore, the process of synthesizing silver nano-sol does not contain any toxic additive, which makes the product possesse a wide application in the future.%采用光化学还原法,以银氨溶液为前驱体,PVP为保护剂制备分散性良好和粒径分布窄的纳米银溶胶.利用透射电子显微镜(TEM)和紫外-可见分光光度计(UV-Vis)对纳米银溶胶进行表征.结果表明,紫外光照时间和PVP浓度都对该反应有明显的影响,在[Ag(NH3)2]+浓度为1mmol/L,n(PVP)([Ag(NH3)2]+)=50时,反应30min就可以生成理想的纳米银溶胶.此外,该方法没有使用有毒添加剂,制备的纳米银溶胶更为安全,从而可以应用在更为广阔的领域.