Unraveling the Evolution and Nature of the Plasmons in (Au Core)–(Ag Shell) Nanorods

Jiang, Ruibin; Chen, Huanjun; Shao, Lei; Li, Qian; Wang, Jianfang

doi:10.1002/adma.201201896

Cited by 225 publications

(342 citation statements)

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“…The rise of two higher energy bands at shorter wavelengths is believed to be due to the octupolar plasmonic modes, with the peaks at 506 and 575 nm corresponding to the transverse and longitudinal dipolar plasmonic modes. 25,27,28 At higher Ag/Au molar ratios, the rod shape was no longer maintained and a large fraction of irregular silver shells was observed (data not shown). Only the rod-shaped Au/AgNRs made with the Ag/Au molar ratio of 0.11 were used in the following synthesis and imaging experiments.…”

Section: * S Supporting Informationmentioning

confidence: 99%

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Multishell Au/Ag/SiO₂ Nanorods with Tunable Optical Properties as Single Particle Orientation and Rotational Tracking Probes

et al. 2015

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Three-layer core-shell plasmonic nanorods (Au/Ag/SiO 2-NRs), consisting of a gold nanorod core, a thin silver shell, and a thin silica layer, were synthesized and used as optical imaging probes under a differential interference contrast microscope for single particle orientation and rotational tracking. The localized surface plasmon resonance modes were enhanced upon the addition of the silver shell, and the anisotropic optical properties of gold nanorods were maintained. The silica coating enables surface functionalization with silane coupling agents and provides enhanced stability and biocompatibility. Taking advantage of the longitudinal LSPR enhancement, the orientation and rotational information of the hybrid nanorods on synthetic lipid bilayers and on live cell membranes were obtained with millisecond temporal resolution using a scientific complementary metal-oxide-semiconductor camera. The results demonstrate that the as-synthesized hybrid nanorods are promising imaging probes with improved sensitivity and good biocompatibility for single plasmonic particle tracking experiments in biological systems.Keywords biocompatibility, cell membranes, coupling agents, cytology, image processing, lipid bilayers, MOS devices, nanorods, optical properties, plasmons, probes, silanes, silica, silver, surface plasmon resonance, anisotropic optical properties, complementary metal oxide semiconductors, differential interference contrast microscopes, localized surface plasmon resonance, plasmonic particles, silane coupling agent, tunable optical properties, chemistry, light related phenomena, molecular probe, tumor cell line, nanotubes, optical phenomena Disciplines Chemistry CommentsReprinted (adapted) with permission from Analytical Chemistry 87 (2015) ABSTRACT: Three-layer core−shell plasmonic nanorods (Au/Ag/SiO 2 −NRs), consisting of a gold nanorod core, a thin silver shell, and a thin silica layer, were synthesized and used as optical imaging probes under a differential interference contrast microscope for single particle orientation and rotational tracking. The localized surface plasmon resonance modes were enhanced upon the addition of the silver shell, and the anisotropic optical properties of gold nanorods were maintained. The silica coating enables surface functionalization with silane coupling agents and provides enhanced stability and biocompatibility. Taking advantage of the longitudinal LSPR enhancement, the orientation and rotational information of the hybrid nanorods on synthetic lipid bilayers and on live cell membranes were obtained with millisecond temporal resolution using a scientific complementary metal-oxide-semiconductor camera. The results demonstrate that the as-synthesized hybrid nanorods are promising imaging probes with improved sensitivity and good biocompatibility for single plasmonic particle tracking experiments in biological systems.S

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Section: * S Supporting Informationmentioning

confidence: 99%

“…This plasmonic band shift can be used to estimate the Ag shell thickness as well as to direct further syntheses. 26,28,30 The Au/AgNRs with the Ag/Au molar ratio of 0.11 maintained the original cylindrical rod shape. Figure S2 curve b in the Supporting Information shows the four plasmonic bands at 339, 400, 506, and 563 nm.…”

Section: * S Supporting Informationmentioning

confidence: 99%

Multishell Au/Ag/SiO₂ Nanorods with Tunable Optical Properties as Single Particle Orientation and Rotational Tracking Probes

et al. 2015

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“…The extinction bands of the coreshell nanorods have large extinction coefficients in the visible region, and the bands are very sensitive to the shapes of the silver shells. 9,11 This means that a conventional spectrophotometer, not an advanced fluorescence spectrometer, has the potential to detect even faint oxidation of the silver shells. Under the present experimental conditions, the spectral changes shown in Figure 1 could be clearly seen with the naked eye.…”

Section: ¹2mentioning

confidence: 99%

“…9,11 Thus, the coreshell nanorods are silver-stained nanoparticles that have the potential for use as highly sensitive probes for quantitative analysis. Huang et al have reported the detection of DNA 12 and Chen et al have reported sensitive detection of mercuric ions using coreshell nanorods.…”

Section: 5mentioning

confidence: 99%

“…10 These extinction bands originate from the surface plasmon (SP) oscillation of silver cuboids and have considerably larger extinction coefficients than those of the gold nanorods. 9,11 Thus, the coreshell nanorods are silver-stained nanoparticles that have the potential for use as highly sensitive probes for quantitative analysis. Huang et al have reported the detection of DNA 12 and Chen et al have reported sensitive detection of mercuric ions using coreshell nanorods.…”

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Enzymatic Decomposition of Hydrogen Peroxides to Suppress Oxidation of Gold–Silver Core–Shell Nanorods: Colorimetry of Horseradish Peroxidase (HRP) and Catalase

Kiya¹,

Tsuru²,

Niidome³

2016

Chem. Lett.

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Goldsilver coreshell nanorods were deposited on a glass plate, and the plate was immersed in hydrogen peroxide solution to oxidize the silver shells. When catalase and horseradish peroxidase (HRP) were deposited on the plates, they decomposed the hydrogen peroxide at the surface and suppressed the oxidation of the silver shells. The surface densities of catalase and HRP were 3.1¯g cm ¹2 and 5 ng cm ¹2, respectively, comparable to detection limits of conventional enzyme-linked immunosorbent assays. Our protocol has the potential for application in a sensitive and quantitative immunoassay.Keywords: Immunoassay | Au-Ag core-shell nanorod | Silver-shell oxidation colorimetrySilver nanoparticles are a remarkable plasmonic material because of their large extinction coefficients and efficient enhancement of nonlinear optical phenomena.1 However, they are easily oxidized in aqueous solution, and their spectroscopic properties are not retained when they are used as colloidal solutions. A popular method for exploiting the properties of silver nanoparticles is "silver staining", a technique that enhances the extinction of gold nanoparticles by coating them with a silver shell.2,3 The larger extinction coefficient of silverstained gold nanoparticles contributes to the sensitive detection of target molecules in the tissue section and paper strip of an immunoaffinity chromatograph. Silver staining is an electroless plating technique that requires great skill, and intense efforts have been made to deposit reproducible and controllable silver layers on core nanoparticles. 3 Silver staining has been frequently used in qualitative analysis to improve the limit of detection, but recently quantitative immunoassays using silver staining processes have been reported. 4,5Previously, we reported uniform silver-shell formation on gold nanorods. 610 Since our coreshell nanorods had uniform shapes, their extinction spectra showed four distinctive extinction bands.10 These extinction bands originate from the surface plasmon (SP) oscillation of silver cuboids and have considerably larger extinction coefficients than those of the gold nanorods. 9,11 Thus, the coreshell nanorods are silver-stained nanoparticles that have the potential for use as highly sensitive probes for quantitative analysis. Huang et al. have reported the detection of DNA 12 and Chen et al. have reported sensitive detection of mercuric ions using coreshell nanorods. 13 In addition, we have previously discussed the spectral changes induced by electrochemical oxidation of the silver shells 6,7 and shown that these changes were caused by the reverse reaction of silver staining.The dramatic spectral changes during the oxidation of the silver shells can therefore be used a probe for oxidants. 14,15 In this study, AuAg coreshell nanorods were fixed onto a plate, and hydrogen peroxide was used to oxidize the silver shells. Oxidation of the silver shells was suppressed by enzymatic reactions that decomposed the hydrogen peroxide at the surface of the plate. The spectroscopic cha...

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Jin

2018

Bimetallic Nanostructures

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Unraveling the Evolution and Nature of the Plasmons in (Au Core)–(Ag Shell) Nanorods

Cited by 225 publications

References 44 publications

Multishell Au/Ag/SiO₂ Nanorods with Tunable Optical Properties as Single Particle Orientation and Rotational Tracking Probes

Multishell Au/Ag/SiO₂ Nanorods with Tunable Optical Properties as Single Particle Orientation and Rotational Tracking Probes

Enzymatic Decomposition of Hydrogen Peroxides to Suppress Oxidation of Gold–Silver Core–Shell Nanorods: Colorimetry of Horseradish Peroxidase (HRP) and Catalase

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Unraveling the Evolution and Nature of the Plasmons in (Au Core)–(Ag Shell) Nanorods

Cited by 225 publications

References 44 publications

Multishell Au/Ag/SiO2 Nanorods with Tunable Optical Properties as Single Particle Orientation and Rotational Tracking Probes

Multishell Au/Ag/SiO2 Nanorods with Tunable Optical Properties as Single Particle Orientation and Rotational Tracking Probes

Enzymatic Decomposition of Hydrogen Peroxides to Suppress Oxidation of Gold–Silver Core–Shell Nanorods: Colorimetry of Horseradish Peroxidase (HRP) and Catalase

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Multishell Au/Ag/SiO₂ Nanorods with Tunable Optical Properties as Single Particle Orientation and Rotational Tracking Probes

Multishell Au/Ag/SiO₂ Nanorods with Tunable Optical Properties as Single Particle Orientation and Rotational Tracking Probes