title: Single-crystalline octahedral Au-Ag nanoframes.
abstract: We report the formation of single-crystalline octahedral Au-Ag nanoframes by a modified galvanic replacement reaction. Upon sequential addition of AgNO(3), CuCl, and HAuCl(4) 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.
authors.affiliation: Department of Chemistry and State Key Laboratory of Low-Dimensional Quantum Physics, Tsinghua University, Beijing 100084, China.
authors.forename: Xun
authors.initials: X
authors.lastname: Hong
authors.forename: Dingsheng
authors.initials: D
authors.lastname: Wang
authors.forename: Shuangfei
authors.initials: S
authors.lastname: Cai
authors.forename: Hongpan
authors.initials: H
authors.lastname: Rong
authors.forename: Yadong
authors.initials: Y
authors.lastname: Li