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Seed‐Mediated Synthesis of Gold Tetrahedra in High Purity and with Tunable, Well‐Controlled Sizes
Author(s) -
Zheng Yiqun,
Liu Wenying,
Lv Tian,
Luo Ming,
Hu Hefei,
Lu Ping,
Choi SangIl,
Zhang Chao,
Tao Jing,
Zhu Yimei,
Li ZhiYuan,
Xia Younan
Publication year - 2014
Publication title -
chemistry – an asian journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.18
H-Index - 106
eISSN - 1861-471X
pISSN - 1861-4728
DOI - 10.1002/asia.201402499
Subject(s) - tetrahedron , materials science , bromide , nanocrystal , chemical engineering , seed crystal , nanotechnology , crystal growth , single crystal , crystallography , inorganic chemistry , chemistry , engineering
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.