纳米金溶胶的合成及紫外-可见吸收光谱的研究

在弱酸性或近中性条件下,用化学还原剂还原较高浓度的氯金酸溶液,制得纳米金种子溶液,然后用晶种法制备金溶胶。通过透射电镜、激光粒度分布仪等测定了纳米颗粒的粒径和分布情况,并对纳米金溶胶的紫外可见吸收曲线进行了研究。结果表明,以硼氢化钠为还原剂可以得到粒径小且分布均匀的产品,采用不同大小的晶种制备的纳米金颗粒的粒径不同,且随粒径变大紫外-可见吸收曲线上的最大吸收波长红移也越大,分布变宽。

Synthesis of gold nanosol and study on ultraviolet-visible absorption spectra

Gold nanoparticles had been synthesized under the low-acid or the near neutral condition by chemical reductant in the high concentration of chloroauric acid solution.The particle size and distribution were determined by transmission electron microscopy and laser particle size distribution analyzer,ultraviolet-visible absorption curve was also characterized.The results showed that the product with small particle size and good distribution could be obtained with taking sodium borohydride as reductant.Gold nanoparticles had different particle sizes as using crystal seeds with different sizes.With increasing the particle size,the maximum absorption wave of ultraviolet-visible absorption curve will be larger and distribution will be wider.