Huo Ziyang, Tsung Chia-Kuang, Huang Wenyu, Zhang Xiaofeng, Yang Peidong
Department of Chemistry, University of California, Berkeley, California 94720, USA.
Nano Lett. 2008 Jul;8(7):2041-4. doi: 10.1021/nl8013549. Epub 2008 Jun 7.
Ultrathin single crystal Au nanowires with diameter of approximately 1.6 nm and length of few micrometers were synthesized with high yield by simply mixing HAuCl 4 and oleylamine at room temperature. High resolution transmission electron microscopy studies revealed that all of these nanowires are single crystalline and grew along the [111] direction. The valency evolution of the gold species during the synthesis was studied by X-ray photoelectron spectroscopy, which showed a clear Au (3+) --> Au (+) --> Au stepwise reduction at different reaction stages. Small angle X-ray scattering and small-angle X-ray diffraction suggest mesostructure formation upon HAuCl 4 and oleylamine mixing. The slow in situ reduction of this mesostructure leads to the formation of ultrathin nanowires in solution. This novel nanowire growth mechanism relies on cooperative interaction, organization, and reaction between inorganic precursor salts and oleylamine.
通过在室温下简单混合氯金酸（HAuCl₄）和油胺，以高产率合成了直径约为1.6纳米、长度为几微米的超薄单晶金纳米线。高分辨率透射电子显微镜研究表明，所有这些纳米线都是单晶的，并且沿[111]方向生长。通过X射线光电子能谱研究了合成过程中金物种的价态演变，结果表明在不同反应阶段金呈现出明显的从Au(3+)到Au(+)再到Au的逐步还原过程。小角X射线散射和小角X射线衍射表明，在氯金酸和油胺混合后形成了介观结构。这种介观结构的缓慢原位还原导致在溶液中形成超薄纳米线。这种新颖的纳米线生长机制依赖于无机前体盐和油胺之间的协同相互作用、组织和反应。
