Structure and stability of silver nanoparticles in aqueous solution produced by laser ablation
Structure and stability of silver nanoparticles in aqueous solution produced by laser ablation
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DOI：
10.1021/jp001803b
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发表时间：
2000-09-07
影响因子：
3.3
通讯作者：
Sawabe, H
中科院分区：
文献类型：
--
作者：
Mafuné, F;Kohno, J;Sawabe, H
通过在表面活性剂CnH 2n +1 SO 4 Na（n = 8，10，12，16）的水溶液中激光烧蚀金属银板制备银纳米颗粒。通过电子显微镜和紫外-可见吸收光谱对由此产生的纳米颗粒进行了表征。在离心之前和之后的纳米颗粒的丰度作为表面活性剂浓度的函数进行测量。丰度的浓度依赖性意味着表面活性剂的覆盖率和纳米颗粒表面的电荷状态与纳米颗粒在溶液中的稳定性密切相关。当覆盖率小于1时，纳米颗粒倾向于聚集，而当表面覆盖有双层表面活性剂分子时，它们非常稳定。
Silver nanoparticles were produced by laser ablation of a metal silver plate in aqueous solutions of surfactants, CnH2n+1SO4Na (n = 8, 10, 12, 16). The nanoparticles thus produced were characterized by electron microscopy and UV-visible absorption spectroscopy. The abundances of the nanoparticles before and after centrifugation were measured as a function of the surfactant concentration. The concentration dependence of the abundance implies that the surfactant coverage and the charge state on the nanoparticle surface are closely related to the stability of the nanoparticles in the solutions. The nanoparticles tend to be aggregated when the coverage is less than unity, while they are very stable when the surface is covered with a double layer of the surfactant molecules.