Jiang Peng, Zhou Jian-Jun, Li Rui, Wang Zhong-Lin, Xie Si-Shen
National Center for Nanoscience and Technology (NCNST), Beijing 100080, People's Republic of China.
Nanotechnology. 2006 Jul 28;17(14):3533-8. doi: 10.1088/0957-4484/17/14/029. Epub 2006 Jun 20.
Poly(vinyl pyrrolidone)-capped multiple twinned gold (Au) particles with decahedral shape have been synthesized by a simple and convenient solvothermal wet chemical method. In the process, hydrogen tetrachloroauric acid (HAuCl(4).3H(2)O) was reduced by ethylene glycol (EG) to form the multiple twinned Au nanocrystals in the presence of poly(vinyl pyrrolidone) (PVP) molecules at 200 degrees C under the extra condition of autogenous pressure. The decahedral nanoparticles take up about 10% of the total amount and have the usual size distribution from several tens to hundreds of nanometres. Some larger microsized five-twinned Au particles with perfect decahedral shape have also been observed in the final product. Furthermore, x-ray photoelectron spectroscopy (XPS) measurements verified that PVP molecules are adsorbed on the surface of the Au particles. Based on the experimental results, a growth mechanism has been suggested to elucidate the formation of the small decahedral Au nanoparticles as well as their evolution into perfect large decahedral Au particles with the size of several micrometres.
通过一种简单便捷的溶剂热湿化学方法合成了具有十面体形状的聚乙烯吡咯烷酮包覆的多重孪晶金（Au）颗粒。在此过程中，在200℃自生压力的额外条件下，四氯金酸（HAuCl₄·3H₂O）在聚乙烯吡咯烷酮（PVP）分子存在下被乙二醇（EG）还原，形成多重孪晶金纳米晶体。十面体纳米颗粒约占总量的10%，具有从几十到几百纳米的常见尺寸分布。在最终产物中还观察到一些更大的具有完美十面体形状的微米级五重孪晶金颗粒。此外，X射线光电子能谱（XPS）测量证实PVP分子吸附在金颗粒表面。基于实验结果，提出了一种生长机制来阐明小十面体金纳米颗粒的形成以及它们演变成尺寸为几微米的完美大十面体金颗粒的过程。
