Single-Crystalline Octahedral
Au–Ag Nanoframes
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Abstract
We report the formation of single-crystalline octahedral
Au–Ag
nanoframes by a modified galvanic replacement reaction. Upon sequential
addition of AgNO<sub>3</sub>, CuCl, and HAuCl<sub>4</sub> 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