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Nano Research 2016, 9(3): 876-885 https://doi.org/10.1007/s12274-015-0969-6
Research Article | Issue | Published: 14 January 2016

Surface micro/nanostructure evolution of Au–Ag alloy nanoplates: Synthesis, simulation, plasmonic photothermal and surface-enhanced Raman scattering applications

Show Author's Information Hongmei Qian1,  Meng Xu1,  Xiaowei Li2,  Muwei Ji1,  Lei Cheng1,  Anwer Shoaib1,  Jiajia Liu1,  Lan Jiang2,  Hesun Zhu1,  Jiatao Zhang1( )
Beijing Key Laboratory of Construction Tailorable Advanced Functional Materials and Green ApplicationsSchool of Materials Science & EngineeringBeijing Institute of TechnologyBeijing100081China
Laser Micro/Nano-Fabrication LaboratorySchool of Mechanical EngineeringBeijing Institute of TechnologyBeijing100081China
Keywords:
photothermal, Au–Ag alloy nanoplates, surface roughening, finite element method (FEM) simulation, surface enhanced Raman scattering (SERS)
Cite this article:
Qian H, Xu M, Li X, et al. Surface micro/nanostructure evolution of Au–Ag alloy nanoplates: Synthesis, simulation, plasmonic photothermal and surface-enhanced Raman scattering applications. Nano Research, 2016, 9(3): 876-885. https://doi.org/10.1007/s12274-015-0969-6
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Abstract Full text Electronic supplementary material About this article

This study reports the controllable surface roughening of Au–Ag alloy nanoplates via the galvanic replacement reaction between single-crystalline triangular Ag nanoplates and HAuCl4 in an aqueous medium. With a combination of experimental evidence and finite element method (FEM) simulations, improved electromagnetic field (E-field) enhancement around the surface-roughened Au–Ag nanoplates and tunable light absorption in the near-infrared (NIR) region (~800–1, 400 nm) are achieved by the synergistic effects of the localized surface plasmon resonance (LSPR) from the maintained triangular shape, the controllable Au–Ag alloy composition, and the increased surface roughness. The NIR light extinction enables an active photothermal effect as well as a high photothermal conversion efficiency (78.5%). The well-maintained triangular shape, surface-roughened evolutions of both micro- and nanostructures, and tunable NIR surface plasmon resonance effect enable potential applications of the Au–Ag alloy nanoplates in surface-enhanced Raman spectroscopic detection of biomolecules through 785-nm laser excitation.


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About this article

Surface micro/nanostructure evolution of Au–Ag alloy nanoplates: Synthesis, simulation, plasmonic photothermal and surface-enhanced Raman scattering applications

Show Author's information Hongmei Qian1, Meng Xu1, Xiaowei Li2, Muwei Ji1, Lei Cheng1, Anwer Shoaib1, Jiajia Liu1, Lan Jiang2, Hesun Zhu1, Jiatao Zhang1( )
Beijing Key Laboratory of Construction Tailorable Advanced Functional Materials and Green ApplicationsSchool of Materials Science & EngineeringBeijing Institute of TechnologyBeijing100081China
Laser Micro/Nano-Fabrication LaboratorySchool of Mechanical EngineeringBeijing Institute of TechnologyBeijing100081China

Abstract

This study reports the controllable surface roughening of Au–Ag alloy nanoplates via the galvanic replacement reaction between single-crystalline triangular Ag nanoplates and HAuCl4 in an aqueous medium. With a combination of experimental evidence and finite element method (FEM) simulations, improved electromagnetic field (E-field) enhancement around the surface-roughened Au–Ag nanoplates and tunable light absorption in the near-infrared (NIR) region (~800–1, 400 nm) are achieved by the synergistic effects of the localized surface plasmon resonance (LSPR) from the maintained triangular shape, the controllable Au–Ag alloy composition, and the increased surface roughness. The NIR light extinction enables an active photothermal effect as well as a high photothermal conversion efficiency (78.5%). The well-maintained triangular shape, surface-roughened evolutions of both micro- and nanostructures, and tunable NIR surface plasmon resonance effect enable potential applications of the Au–Ag alloy nanoplates in surface-enhanced Raman spectroscopic detection of biomolecules through 785-nm laser excitation.

Keywords: photothermal, Au–Ag alloy nanoplates, surface roughening, finite element method (FEM) simulation, surface enhanced Raman scattering (SERS)

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Publication history
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Acknowledgements

Publication history

Received: 21 March 2015
Revised: 02 December 2015
Accepted: 06 December 2015
Published: 14 January 2016
Issue date: March 2016

Copyright

© Tsinghua University Press and Springer-Verlag Berlin Heidelberg 2015

Acknowledgements

Acknowledgements

This work was supported by the National Natural Science Foundation of China (Nos. 91323301, 21322105, and 51372025), the Research Fund for the Doctoral Program of Higher Education of China (No. 2011101120016) and Program for New Century Excellent Talents in University (No. NCET-11-0793). The authors would like to thank Prof. Chen Wang and Prof. Yanjun Guo of National Center for Nanoscience and Technology, China for AFM and SERS measurements and helpful discussions, respectively; Dr. Haiwei Li for help on BET tests and helpful discussions.

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