Seed‐Mediated Synthesis of Gold Tetrahedra in High Purity and with Tunable,Well‐Controlled Sizes |
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| Authors: | Yiqun Zheng Wenying Liu Tian Lv Ming Luo Dr Hefei Hu Dr Ping Lu Dr Sang‐Il Choi Chao Zhang Dr Jing Tao Prof Yimei Zhu Prof Zhi‐Yuan Li Prof Younan Xia |
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| Institution: | 1. School of Chemistry and Biochemistry, Georgia Institute of Technology, Atlanta, Georgia 30332 (USA), Fax: (+1)?404‐385‐3209;2. School of Chemical and Bimolecular Engineering, Georgia Institute of Technology, Atlanta, Georgia 30332 (USA);3. The Wallace H. Coulter Department of Biomedical Engineering, Georgia Institute of Technology and Emory University, Atlanta, Georgia 30332 (USA);4. Condensed Matter Physics and Materials Science Department, Brookhaven National Laboratory, Upton, New York 11973 (USA);5. Institute of Physics, Chinese Academy of Science, Beijing 100190 (China) |
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| Abstract: | 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. |
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| Keywords: | gold nanocrystals seeded growth shape control tetrahedron |
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