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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300~800nm)在420nm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10nm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。
Using diethanolamine as reductant, silver nitrate as precursor and polyethylene glycol as stabilizer, the reaction was carried out at 65 ℃ for 1 hour to obtain a highly stable monodisperse nano-silver sol. The UV-Vis absorption spectrum (wavelength 300 ~ 800nm) of sol has a unique absorption peak at around 420nm, which is the characteristic plasmon resonance absorption peak of typical spherical silver nano-ions. X-ray diffraction patterns show that the prepared silver nanoparticles are face-centered cubic structures. The transmission electron microscopy results show that the silver particles are spherical and monodispersed with a particle size of about 10 nm. In addition, the nanosilver sol prepared by this method has good stability and does not show any flocculation and precipitation for 3 months at room temperature after stored for 3 months.