Controlled Synthesis of Au@AgAu Yolk-Shell Cuboctahedra with Well-Defined Facets

被引:33
作者
Londono-Calderon, Alejandra [1 ]
Bahena, Daniel [2 ]
Yacaman, Miguel J. [1 ]
机构
[1] Univ Texas San Antonio, Dept Phys & Astron, One UTSA Circle, San Antonio, TX 78249 USA
[2] CINVESTAV, Adv Lab Electron Nanoscopy, Delegat Gustavo A Madero, Av Inst Politecn Nacl 2508, Mexico City 07360, DF, Mexico
基金
美国国家卫生研究院;
关键词
GALVANIC REPLACEMENT REACTIONS; OPTICAL-PROPERTIES; CORE-SHELL; HOLLOW NANOPARTICLES; CATALYTIC-PROPERTIES; ALLOY NANOPARTICLES; GOLD NANOPARTICLES; METAL NANOCRYSTALS; MESOPOROUS SILICA; FACILE SYNTHESIS;
D O I
10.1021/acs.langmuir.6b01888
中图分类号
O6 [化学];
学科分类号
0703 ;
摘要
The synthesis of Au@AgAu yolk-shell cuboctahedra nanoparticles formed by galvanic replacement in a seed-mediated method is described. Initially, single-crystal Au seeds are used for the formation of Au@Ag core-shell nanocubes, which serve as the template material for the deposition of an external Au layer. The well-controlled synthesis yields the formation of cuboctahedra nanoparticles with smooth inner and outer Au/Ag surfaces. The deposition/oxidation process is described to understand the formation of cuboctahedra and octahedra nanoparticles. The Au core maintains the initial morphology of the seed and remains static at the center of the yolk-shell because of residual Ag. Structural analysis of the shell indicates intrinsic stacking faults (SFs) near the surface. Energy dispersive X-ray spectroscopy (EDS) and X-ray photoelectron spectroscopy (XPS) compositional analysis show an Au-Ag nonordered alloy forming the shell. The three-dimensional structure of the nanoparticles presented open facets on the [111] as observed by electron tomography SIRT reconstruction over a stack of high-angle annular dark-field scanning transmission electron microscopy (HAADF-STEM) images. The geometrical model was validated by analyzing the direction of streaks in coherent nanobeam diffraction (NBD). The catalytic activity was evaluated using a model reaction based on the reduction of 4-nitrophenol (4-NTP) by NaBH4 in the presence of Au@AgAu yolk shell nanoparticles.
引用
收藏
页码:7572 / 7581
页数:10
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