期刊
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
卷 134, 期 44, 页码 18165-18168出版社
AMER CHEMICAL SOC
DOI: 10.1021/ja3076132
关键词
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资金
- State Key Project of Fundamental Research for Nanoscience and Nanotechnology [2011CB932401, 2011CBA00500]
- National Natural Science Foundation of China [20921001, 21131004]
We report the formation of single-crystalline octahedral Au-Ag nanoframes by a modified galvanic replacement reaction. Upon sequential addition of AgNO3, CuCl, and HAuCl4 to octadecylamine solution, truncated polyhedral silver nanoparticles formed first and then changed into octahedral Au-Ag nanoframes, without requiring a conventional Ag removal step with additional oxidation etchant. The nanoframes have 12 sides, and all of the eight {111} faces are empty. The side grows along the [110] direction, and the diameter is less than 10 nm. The selective gold deposition on the high-energy (110) surface, the diffusion, and the selective redeposition of Au and Ag atoms are the key reasons for the formation of octahedral nanoframes.
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