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.
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