期刊
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
卷 17, 期 10, 页码 6819-6826出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/c4cp05642f
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资金
- National Natural Science Foundation of China [61275153, 61320106014, 11404177]
- Natural Science Foundation of Zhejiang [LY12A04002]
- Natural Science Foundation of Ningbo [2012A610107, 2014A610120]
- K. C. Wong Magna Foundation of Ningbo University, China
- Collaboration Research Fund from the Hong Kong Research Grants Council [CUHK1/CRF/1G]
Novel Au@Ag core-shell nanocubes (NCs) were successfully prepared by the controlled epitaxial growth of Ag shells onto Au nanoellipsoids (NEs) in the presence of surfactants. The growth mechanism of the Au@Ag core-shell NCs was systematically investigated by analyzing their morphology, optical properties, and crystallography. The localized surface plasmon resonance (LSPR) characteristics and the electric field distribution of the Au@Ag core-shell NCs were studied using the finite element method (FEM) based on the plasmon hybridization theory. Compared with pure Ag NCs, the absorption spectrum of the Au@Ag core-shell NCs exhibits a red shift and a weak shoulder near 550 nm, and the notable enhancement of electric field occurs around the corners along the long-axis of the Au ellipsoidal core because of plasmonic resonant coupling. Surface-enhanced Raman scattering (SERS) of the Au(@Ag core-shell NCs labeled with 4-mercaptobenzoic acid molecules reveals that the bimetallic core-shell NCs possess efficient SERS activity with an enhancement factor EF = 2.27 x 10(6), thus confirming the possibility of using the Au@Ag core-shell NCs as a stable probe for SERS-based biosensing applications.
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