Ag Dendrite-Based Au/Ag Bimetallic Nanostructures with Strongly Enhanced Catalytic Activity

被引：194

作者：

Huang, Jianfeng ^{[1
]}

Vongehr, Sascha ^{[1
]}

Tang, Shaochun ^{[1
]}

Lu, Haiming ^{[1
]}

Shen, Jiancang ^{[1
]}

Meng, Xiangkang ^{[1
]}

机构：

[1] Nanjing Univ, Natl Lab Solid State Microstruct, Dept Mat Sci & Engn, Nanjing 210093, Peoples R China

来源：

LANGMUIR | 2009年 / 25卷 / 19期

基金：

中国国家自然科学基金;

关键词：

GALVANIC REPLACEMENT REACTION; RAMAN-SCATTERING; GOLD; NANOPARTICLES; REDUCTION; FABRICATION; NANOWIRES; COLLOIDS; HAUCL4; HOLLOW;

D O I：

10.1021/la9015383

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

Dendritic Ag/Au bimetallic nanostructures have been synthesized via a galvanic replacement reaction (GRR) of Ag dendrites in it chlorauric acid (HAuCl4) solution. After short periods of time, one obtains structures with protruding flakes; these will mature into very porous structures with little Ag left over. The morphological, compositional, and crystal structural changes involved with reaction time t were analyzed by using scanning and transmission electron microscopy (SEM and TEM, respectively), energy-dispersive X-ray spectrometry (EDX), and X-ray diffraction. High-resolution TEM combined with EDX and selected area electron diffraction confirmed the replacement of Ag with Au. A proposed fort-nation mechanism of the original Ag dendrites developing pores while growing Au flakes cover this underlying structure at longer reaction times is confirmed by exploiting surface-enhanced Raman scattering (SERS). Catalytic reduction of 4-nitrophenol (4-NP) by sodium borohydride (NaBH4) is strongly enhanced, implying promising applications in catalysis.

引用

页码：11890 / 11896

页数：7

共 45 条

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