Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 6, Issue 5, Pages 3331-3340Publisher
AMER CHEMICAL SOC
DOI: 10.1021/am405357v
Keywords
Ag; Au; nanorods; shape control; core-shell structure; refractive index sensitivity; surface-enhanced Raman scattering
Funding
- National Key Basic Research Program of China [2011CB933503]
- National Natural Science Foundation of China [61127002, 21273002]
- Open Project Program [KF-GN-201107]
- Jiangsu province science and technology support project [BE2013725]
- Basic Research Program of Jiangsu Province [BK2011036, BK2011590]
- Priority Academic Program Development of Jiangsu Higher Education Institutions
Ask authors/readers for more resources
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.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available