摘要
一位金属性的先锋的化学作文的适当选择，在 nanocrystals 的生长过程生产基本结构单位，是在合成的高优先级金属特别 Au-nanoparticles。在现在的工作， Au 播种(面对 cetyltrimethylammonium 溴化物(CTAB ) 与 NaBH4 由 Au3+ 答案的减小准备了) 被用来从二位不同 Au 先锋开始 Au nanoparticles 的生长。当面对 CTAB 微粒准备的水的 Au+ 溶液面对金种子与维生素酸被对待时，金 nanoparticles 的高收益(多达 92%) 被获得。由与 Au+ 的固定数量改变种子解决方案的卷，我们能有效地从立方体控制产生 Au nanoparticles 的词法转变到 octahedra。当一个水的 Au3+ 答案面对 CTAB 微粒被准备并且面对金种子与维生素酸对待时， Au nanoparticles 的更小的收益被获得。初步的生长机制基于改变维生素酸和 Au+ 的集中的比率的数量到种子的数字导致的变化被建议了。
The appropriate choice of chemical composition of a metallic precursor, which produces the basic structure units in the growth process of nanocrystals, is a high priority in the synthesis of metal--especially Au--nanoparticles. In the present work, Au seeds （prepared by the reduction of Au3＋ solution with NaBI~ in the presence of cetyltrimethylammonium bromide （CTAB）） have been used to initiate the growth of Au nanoparticles from two different Au precursors. When an aqueous Au＋ solution prepared in the presence of CTAB micelles was treated with ascorbic acid in the presence of the gold seeds, a high yield （up to 92%） of gold nanoparticles was obtained. By varying the volume of the seed solution with a fixed amount of Au＋, we can effectively control the morphological transformation of the resulting Au nanoparticles from cubes to octahedra. When an aqueous Au3＋ solution was prepared in the presence of CTAB micelles and treated with ascorbic acid in the presence of the gold seeds, smaller yields of Au nanoparticles were obtained. A preliminary growth mechanism has been proposed based on the changes induced by varying the amount of ascorbic acid and the ratio of the concentration of Au＊ to the number of seeds.
基金
Acknowledgements This work was supported by National Basic Research Program of China （973 Program No. 2009CB930703） and National Natural Science Foundation of China （No. 21033007）. We thank Dr. Jiawei Yan, Yongli Zheng, and Haixin Lin for helpful discussion. We also thank Zhaobin Chen for ICP-AES measurements.
