还原剂对纳米金粒子大小及粒径分布的影响

探究了还原剂盐酸羟胺、硼氢化钠对于纳米金颗粒的形貌、粒径分布的影响,用紫外和透射电子显微镜（TEM）对还原得到的纳米金形貌和粒径进行了表征,并用对硝基苯酚转化为对氨基苯酚的模板反应评价了其催化性能.结果显示,单独以盐酸羟胺为还原剂时,在实验条件下不能将三价金还原为Au0;以盐酸羟胺、硼氢化钠依次为还原剂制备的纳米金基本呈球形,粒径较小,平均粒径为4.0 nm,粒径分布均匀、转化频率（TOF）高、催化效果最好.其中硼氢化钠不仅为盐酸羟胺提供了碱性环境,同时起到了一定的还原作用.

The Effects of Reducing Agents on Particle Size and Distribution of Prepared Gold Nanoparticles

The effects of different reductants （ shape, average size and GNPs were characterized duction of p-nitrophenol spherical, and the GNPs hydroxylamine hydrochloride, sodium borohydride） on size distribution of gold nanoparticles （GNPs） were investigated. The prepared by UV-vis and TEM. The catalytic activities of GNPs were evaluated in the re- to p-aminophenol. By TEM characterization, the prepared GNPs were almost prepared by the combination usage of hydroxylamine hydroehloride followed by sodium borohydride in sequence as reducing agents were with minimal size of 4.0 nm in mean diameter and with better size distribution, and therefore showed the best eatalytic performance and high TOF in the reduction of p-nitrophenol into p-aminophenol. Meanwhile, sodium borohydride not only provided an al- kaline condition for hydroxylamine hydroehloride, but also acted as an important redueing agent.