Zheng Yiqun, Liu Wenying, Lv Tian, Luo Ming, Hu Hefei, Lu Ping, Choi Sang-Il, Zhang Chao, Tao Jing, Zhu Yimei, Li Zhi-Yuan, Xia Younan
School of Chemistry and Biochemistry, Georgia Institute of Technology, Atlanta, Georgia 30332 (USA), Fax: (+1) 404-385-3209.
Chem Asian J. 2014 Sep;9(9):2635-40. doi: 10.1002/asia.201402499. Epub 2014 Jun 27.
We report a facile synthesis of Au tetrahedra in high purity and with tunable, well-controlled sizes via seed-mediated growth. The success of this synthesis relies on the use of single-crystal, spherical Au nanocrystals as the seeds and manipulation of the reaction kinetics to induce an unsymmetrical growth pattern for the seeds. In particular, the dropwise addition of a precursor solution with a syringe pump, assisted by cetyltrimethylammonium chloride and bromide at appropriate concentrations, was found to be critical to the formation of Au tetrahedra in high purity. Their sizes could be readily tuned in the range of 30-60 nm by simply varying the amount of precursor added to the reaction solution. The current strategy not only enables the synthesis of Au tetrahedra with tunable and controlled sizes but also provides a facile and versatile approach to reducing the symmetry of nanocrystals made of a face-centered cubic lattice.
我们报道了一种通过种子介导生长法简便合成高纯度、尺寸可调且可控的金四面体的方法。该合成方法的成功依赖于使用单晶球形金纳米晶体作为种子，并操控反应动力学以诱导种子形成不对称生长模式。特别地，发现通过注射泵逐滴添加前驱体溶液，并在适当浓度的十六烷基三甲基氯化铵和溴化物辅助下，对于高纯度金四面体的形成至关重要。通过简单改变添加到反应溶液中的前驱体的量，其尺寸可在30 - 60纳米范围内轻松调节。当前策略不仅能够合成尺寸可调且可控的金四面体，还提供了一种简便且通用的方法来降低由面心立方晶格构成的纳米晶体的对称性。
