Controllable Preparation of Core-Shell Au-Ag Nanoshuttles with Improved Refractive Index Sensitivity and SERS Activity

被引:86
|
作者
Bai, Tingting [1 ]
Sun, Jianfei [1 ]
Che, Renchao [3 ,4 ]
Xu, Lina [1 ]
Yin, Chenyue [1 ]
Guo, Zhirui [2 ]
Gu, Ning [1 ]
机构
[1] Southeast Univ, State Key Lab Bioelect, Jiangsu Key Lab Biomat & Devices, Sch Biol Sci & Med Engn, Nanjing 210096, Jiangsu, Peoples R China
[2] Nanjing Med Univ, Affiliated Hosp 2, Nanjing 210011, Jiangsu, Peoples R China
[3] Fudan Univ, Dept Mat Sci, Shanghai 200433, Peoples R China
[4] Fudan Univ, Adv Mat Lab, Shanghai 200433, Peoples R China
基金
中国国家自然科学基金;
关键词
Ag; Au; nanorods; shape control; core-shell structure; refractive index sensitivity; surface-enhanced Raman scattering; SURFACE-PLASMONS; GOLD; SILVER; NANORODS; GROWTH; SHAPE; NANOPARTICLES; NANOCRYSTALS; SIZE; POLYELECTROLYTE;
D O I
10.1021/am405357v
中图分类号
TB3 [工程材料学];
学科分类号
0805 ; 080502 ;
摘要
Recent studies have conclusively shown that the plasmonic performance of Au nanostructures can be enhanced by incorporating Ag. Here, we developed a simple and robust approach for preparing core-shell Au-Ag nanoshuttles (NSs) using single-crystal Au nanorods (NRs) as cores. Upon tailoring the temperature of the reaction system containing alkaline glycine buffer (pH 8.5), exceptionally monodisperse Au-Ag NSs with sharp tips and tunable shell thickness could be routinely achieved in high yield through an epitaxial growth process. In particular, high-resolution transmission electron microscopy and nitric acid corrosive experiments revealed that the shells of these NSs consisted of a homogeneous Au-Ag alloy, rather than pure Ag or Au as previously reported. It was found that glycine played an important role in determining the final metal contents of the shell by regulating the reduction kinetics. In addition, the obatined Au-Ag NSs with sharp tips were shown to have significantly improved refractive index. sensitivity and surface-enhanced Raman scattering activity relative to the original Au NRs, making these materials promising for biomedical applications, such as biosensing and biolabeling.
引用
收藏
页码:3331 / 3340
页数:10
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