一种绿色合成稳定单分散纳米银溶胶的新方法

A new method for green synthesis of stable monodisperse nano-silver sol

以二乙醇胺为还原剂、硝酸银为前驱体、聚乙二醇为稳定剂,在65℃时反应1h,得到了高度稳定的单分散纳米银溶胶.溶胶的紫外-可见吸收光谱（波长300～800 nm）在420 nm左右处有唯一的吸收峰,这是典型的球形银纳米离子的特征等离子共振吸收峰.x-射线衍射图表明制备的银纳米粒子为面心立方结构,透射电镜测试表明银粒子为球形、单分散、粒径10 nm左右.此外,通过这种方法制备的纳米银溶胶具有良好的稳定性,室温下避光保存3个月没有出现任何絮凝和沉淀.

A highly stable monodisperse nano silver colloid was prepared using diethanolamine as reducing agent, silver nitrate as precursors, polyglycol（PEG） as stabilizing agent at 65~C for 1 h. The UV-visible absorption spectrum（300 -800 nm）of the colloidal solution showed a unique typical characteristic plasma resonance absorption peak of spherical sil- ver nanoparticles at 420 nm. The peaks in the X-ray diffraction（XRD）pattern showed that prepared silver nanoparticles matched well with the standard values of the face-centred cubic form of metallic silver. The morphologies of the nanoparti- cles were characterized by transmission electron microscopy（TEM）. The results showed that the particles were spherical, monodisperse, uniform with size about 10 nrn. In addition, the sols prepared by this way had good stability, which did not appear any precipitation and flocculation even at room temperature in the dark for 3 months.