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

Hongmei Qian; Meng Xu; Xiaowei Li; Muwei Ji; Lei Cheng; Anwer Shoaib; Jiajia Liu; Lan Jiang; Hesun Zhu; Jiatao Zhang

doi:10.1007/s12274-015-0969-6

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

Hongmei Qian, Meng Xu, Xiaowei Li, Muwei Ji, Lei Cheng, Anwer Shoaib, Jiajia Liu, Lan Jiang, Hesun Zhu, Jiatao Zhang^*

^*Corresponding author for this work

Beijing Institute of Technology

Research output: Contribution to journal › Article › peer-review

39 Citations (Scopus)

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. [Figure not available: see fulltext.]

Original language	English
Pages (from-to)	876-885
Number of pages	10
Journal	Nano Research
Volume	9
Issue number	3
DOIs	https://doi.org/10.1007/s12274-015-0969-6
Publication status	Published - 1 Mar 2016

Keywords

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

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10.1007/s12274-015-0969-6

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

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. [Figure not available: see fulltext.]",

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author = "Hongmei Qian and Meng Xu and Xiaowei Li and Muwei Ji and Lei Cheng and Anwer Shoaib and Jiajia Liu and Lan Jiang and Hesun Zhu and Jiatao Zhang",

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AU - Qian, Hongmei

AU - Xu, Meng

AU - Li, Xiaowei

AU - Ji, Muwei

AU - Cheng, Lei

AU - Shoaib, Anwer

AU - Liu, Jiajia

AU - Jiang, Lan

AU - Zhu, Hesun

AU - Zhang, Jiatao

PY - 2016/3/1

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N2 - 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. [Figure not available: see fulltext.]

AB - 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. [Figure not available: see fulltext.]

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

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