微波法合成纳米金胶体颗粒的调控研究

Studies on Au Colloidal Nanoparticles Synthesized by Microwave Irradiation

用微波法制备高分子聚合物稳定的纳米金胶体颗粒,制得的金纳米颗粒的平均粒径在5～120nm之间.考察了醇还原剂以及碱对金颗粒形成的影响,使用透射电子显微镜、紫外可见分光光度计进行表征.结果表明,微波法制备的金胶体颗粒具有粒径小、分散性好的特点.金颗粒的尺寸和形状随醇还原剂的种类及碱(NaOH)用量的不同而有明显的变化.紫外可见吸收光谱表明,在反应物中加入碱的体系,金颗粒的形成速度明显加快,且利于圆球形金颗粒的形成.

Polymer-stabilized Au colloidal nanoparticles were prepared by microwave irradiation. Size of the Au particles varied from 5 nm to 120 nm along with different reactive conditions. Effects of the alcohol reducing agent and NaOH on particle size and shape were investigated. The prepared Au nanoparticles were characterized by transmission electron microscope（TEM） and ultraviolet-visible（UV-Vis） spectrophotometer. The Au nanoparticles prepared by microware irradiation have small particle size and good size distribution. The nanoparticle size and shape are highly dependent on the nature of the reducing agent and concentration of NaOH. Using UV-Vis spectra, it was found that the velocity of the formation of the Au nanoparticles in the reactive system with adding of NaOH was obviously faster and easier to form spherical particles than that without NaOH.