Plasmon-tunable Au@Ag core-shell spiky nanoparticles for surface-enhanced Raman scattering

Zhulin Huang; Guowen Meng; Xiaoye Hu; Qijun Pan; Dexian Huo; Hongjian Zhou; Yan Ke; Nianqiang Wu

doi:10.1007/s12274-018-2238-y

Nano Research 2019, 12(2): 449-455 https://doi.org/10.1007/s12274-018-2238-y

Research Article | Issue | Published: 21 November 2018

Plasmon-tunable Au@Ag core-shell spiky nanoparticles for surface-enhanced Raman scattering

Show Author's Information Hide Author's Information Zhulin Huang^¹, Guowen Meng^{¹^,²}(

), Xiaoye Hu^¹, Qijun Pan^{¹^,²}, Dexian Huo^{¹^,²}, Hongjian Zhou^¹, Yan Ke^¹, Nianqiang Wu^³(

)

1 Key Laboratory of Materials Physics and Anhui Key Laboratory of Nanomaterials and Technology,Institute of Solid State Physics, Chinese Academy of Sciences, P. O. Box 1129,Hefei,230031,China;

2 University of Science and Technology of China,Hefei,230026,China;

3 Department of Mechanical and Aerospace Engineering,West Virginia University,P.O. Box 6106, Morgantown, WV,26506,USA;

Keywords:

gold, silver, localized surface plasmon resonance, surface-enhanced Raman spectroscopy

Topics:

Core shell nanoparticles Gold Infrared devices Nanoparticles Plasmonics Raman scattering Raman spectroscopy Shells (structures)Silver Silver compounds Substrates

Cite this article:

Huang Z, Meng G, Hu X, et al. Plasmon-tunable Au@Ag core-shell spiky nanoparticles for surface-enhanced Raman scattering. Nano Research, 2019, 12(2): 449-455. https://doi.org/10.1007/s12274-018-2238-y

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Abstract Full text Electronic supplementary material About this article

Abstract

A facile synthetic approach has been developed to prepare uniform and size-tunable spiky Au@Ag core-shell nanoparticles (NPs) to tailor the localized surface plasmon resonance (LSPR) properties. The gradual assembly of small Au nanocrystals allows the size of spiky Au NPs to be modulated from tens to several hundreds of nanometers by tuning the concentration of initial Au seeds and Au source; and the thickness of the Ag shell can be adjusted with stepwise reduction of Ag(Ⅰ) ions. The LSPR bands of such spiky Au@Ag core-shell NPs resemble those of pure spiky Au NP cores of similar sizes in near-infrared region, and increasing the Ag shell thickness results in a blue shift and broadening of the LSPR band in the near-infrared region. Additionally, the spiky Au@Ag core-shell NPs exhibit improved surface-enhanced Raman scattering (SERS) activity as compared to the bare spiky Au NPs and spherical Ag@Au NPs. This work has offered a facile route to synthesize plasmonic metal NPs with LSPR band in 650 to 800 nm that show strong enhancement of localized electromagnetic field, which provides an effective SERS substrate for SERS imaging and detection in biological fluids and tissues.

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About this article

Plasmon-tunable Au@Ag core-shell spiky nanoparticles for surface-enhanced Raman scattering

Show Author's information Hide Author's Information Zhulin Huang^¹, Guowen Meng^{¹^,²}(

), Xiaoye Hu^¹, Qijun Pan^{¹^,²}, Dexian Huo^{¹^,²}, Hongjian Zhou^¹, Yan Ke^¹, Nianqiang Wu^³(

)

1 Key Laboratory of Materials Physics and Anhui Key Laboratory of Nanomaterials and Technology,Institute of Solid State Physics, Chinese Academy of Sciences, P. O. Box 1129,Hefei,230031,China;

2 University of Science and Technology of China,Hefei,230026,China;

3 Department of Mechanical and Aerospace Engineering,West Virginia University,P.O. Box 6106, Morgantown, WV,26506,USA;

Abstract

Keywords: gold, silver, localized surface plasmon resonance, surface-enhanced Raman spectroscopy

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Acknowledgements

Publication history

Received: 13 September 2018

Revised: 20 October 2018

Accepted: 30 October 2018

Published: 21 November 2018

Issue date: February 2019

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Acknowledgements

This work was financially supported by the National Basic Research Program of China (No. 2013CB934304), Key Research Program of Frontier Sciences, CAS (No. QYZDJ-SSW-SLH046), the CAS/SAFEA International Partnership Program for Creative Research Teams, the Natural Science Foundation of China (Nos. 21673245, 51632009, 51628202, 51472245 and 51671186), Hefei Institutes of Physical Sciences, CAS, and the Youth Innovation Promotion Association of CAS.