title: Seed-mediated synthesis of gold tetrahedra in high purity and with tunable, well-controlled sizes.
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.
authors: School of Chemistry and Biochemistry, Georgia Institute of Technology, Atlanta, Georgia 30332 (USA), Fax: (+1) 404-385-3209.
authors: Yiqun
authors: Y
authors: Zheng
authors: Wenying
authors: W
authors: Liu
authors: Tian
authors: T
authors: Lv
authors: Ming
authors: M
authors: Luo
authors: Hefei
authors: H
authors: Hu
authors: Ping
authors: P
authors: Lu
authors: Sang-Il
authors: SI
authors: Choi
authors: Chao
authors: C
authors: Zhang
authors: Jing
authors: J
authors: Tao
authors: Yimei
authors: Y
authors: Zhu
authors: Zhi-Yuan
authors: ZY
authors: Li
authors: Younan
authors: Y
authors: Xia
mesh_terms: D006046:Gold / Q000737:chemistry*; D007700:Kinetics; D053768:Metal Nanoparticles / Q000737:chemistry*; D010316:Particle Size; D013499:Surface Properties
chemical_list: D006046:Gold
keywords: gold; nanocrystals; seeded growth; shape control; tetrahedron