水相法制备小粒径金溶胶

Preparation of Au Colloid of Small Size in Aqueous Solution

摘要:

采用柠檬酸三钠还原氯金酸法制备金溶胶。研究了还原剂用量、试剂加入顺序、反应时间、搅拌速度等因素对金溶胶浓度、粒径、形貌和分散性的影响，使用紫外-可见分光光度计和透射电子显微镜对金溶胶的光学特性、粒径、形貌及结构进行表征。结果表明：制备小粒径金溶胶的最优条件为柠檬酸三钠(0.034 mol/L)与氯金酸(0.024 mol/L)溶液体积比为3:1，将氯金酸加入柠檬酸三钠溶液中为宜，反应时间6 min，搅拌速度约650 r/min；在此最优条件下可成功制备出形貌均一、分散性好、稳定性佳的金溶胶，其平均粒径约6

Abstract:

Au colloid was prepared by reducing HAuCl4·4H2O with Na3C6H5O7·2H2O. The effects of reductant amounts, mixing procedures, reaction time and stirring speed on the concentration, size, shape and monodispersity of Au colloid were investigated. UV-vis and TEM were used to characterize the size, shape, structure and optical properties of the samples. It's found that the optimal conditions for preparing Au colloid of small size are Na3C6H5O7(aq):HAuCl4(aq)=3:1(V:V), mixing Na3C6H5O7 firstly, reacting for 6 min and 650 r/min stirring speed. The colloid was prepared successfully which has superiority in shape, monodispersity and stability. The size of nanoparticles is only about 6~7 nm