光化学还原法制备纳米银溶胶

Preparation of Nano-silver Sol by Photochemical Reduction Method

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)/n([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。

Nano-silver sol with good dispersibility and narrow particle size distribution was prepared by photo chemical reduction of silver ammonia solution precursor with polyvinylpyrrolidone（PVP） as protective agent. Trans mission 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/EAg（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.