Au@Ag core/shell cuboids and dumbbells: Optical properties and SERS response

Khlebtsov, Boris N.; Liu, Zhonghui; Ye, Jian; Khlebtsov, Nikolai G.

doi:10.1016/j.jqsrt.2015.07.024

Cited by 60 publications

(44 citation statements)

References 62 publications

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“…Related discussion and citations can be found in Ref. [37]. In short, a small plasmonic cube can support six fundamental modes as described by Fushs [40].…”

Section: Nanoparticle Synthesis and Characterizationmentioning

confidence: 92%

“…In the case of irregular particles, for all Au/Ag ratios, no such peaks in the short wavelength range had appeared. Recently, we examined the origin of longitudinal (L) and transverse (T1-T3) plasmonic modes in the Au@Ag cuboids [37]. The position of the longitudinal plasmon resonance is determined by the axial ratio of the resultant nanoparticles, whereas the transverse plasmonic mode depends mostly on the shape.…”

Section: Nanoparticle Synthesis and Characterizationmentioning

confidence: 99%

“…The physical nature of the high-order multipole resonances has attracted significant attention at both the ensemble [33,37,38] and single-particle levels [39]. Related discussion and citations can be found in Ref.…”

Section: Nanoparticle Synthesis and Characterizationmentioning

confidence: 99%

“…In short, a small plasmonic cube can support six fundamental modes as described by Fushs [40]. For the thick Ag layer, the influence of Au core on the electromagnetic response of Au@Ag nanocuboids is suppressed [37], and so the extinction spectra of such particles are similar to that for silver nanocuboids. It has been shown [38,41] that the Au@Ag nanocuboids can support seven plasmonic modes, four of which can be excited by longitudinal electric field, and the other three transversal modes can be excited at specific perpendicular polarization of the incident electric field.…”

Section: Nanoparticle Synthesis and Characterizationmentioning

confidence: 99%

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Surface-enhanced Raman scattering inside Au@Ag core/shell nanorods

2016

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The design and synthesis of plasmonic nanoparticles with Raman-active molecules embedded inside them are of significant interest for sensing and imaging applications. However, direct synthesis of such nanostructures with controllable shape, size, and plasmonic properties remains extremely challenging. Here we report on the preparation of uniform Au@Ag core/shell nanorods with controllable Ag shells of 1 to 25 nm in thickness. 1,4-Aminothiophenol (4-ATP) molecules, used as the Raman reporters, were located between the Au core and the Ag shell. Successful embedding of reporter molecules inside the core/shell nanoparticles was confirmed by the absence of selective oxidation of the amino groups, as measured by Raman spectroscopy. The dependence of Raman intensity on the location of the reporter molecules in the inside and outside of the nanorods was studied. The molecules in the interior showed strong and uniform Raman intensity, at least an order of magnitude higher than that of the molecules on the nanoparticle surface. In contrast to the usual surface-functionalized Raman tags, aggregation and clustering of nanoparticles with embedded molecules decreased the surface-enhanced Raman scattering (SERS) signal. The findings from this study provide the basis for a novel detection technique of low analyte concentration utilizing the high SERS response of molecules inside the core/shell metal nanostructures. As an example, we show robust SERS detection of thiram fungicide as low as 10 −9 M in solutions.

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“…Related discussion and citations can be found in Ref. [37]. In short, a small plasmonic cube can support six fundamental modes as described by Fushs [40].…”

Section: Nanoparticle Synthesis and Characterizationmentioning

confidence: 92%

Section: Nanoparticle Synthesis and Characterizationmentioning

confidence: 99%

Section: Nanoparticle Synthesis and Characterizationmentioning

confidence: 99%

Section: Nanoparticle Synthesis and Characterizationmentioning

confidence: 99%

See 2 more Smart Citations

Surface-enhanced Raman scattering inside Au@Ag core/shell nanorods

2016

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“…EM is based on the enhancement of the local electromagnetic field while the CM is based on charge transfer between absorbed molecules and substrate surface. Up to now, many surfaces have been successfully investigated as SERS active substrates such as Ag, Au, Cu, Na, Li, Pd, Pt, the best performances for detection purposes have been recorded in the case of Ag and Au nanoparticles [5][6][7][8][9][10][11][12][13][14][15][16] . Graphene, a two-dimensional monolayer sheet of hexagonal carbon atoms, has attracted great attention because of its unique structure and exceptional physiochemical properties [17][18][19][20] .…”

Section: Introductionmentioning

confidence: 99%

Facial Synthesis of Carrageenan/Reduced Graphene Oxide/Ag Composite as Efficient SERS Platform

Zheng¹,

Wang

Zhong³

et al. 2016

Mat. Res.

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In this paper, we reported the preparation of carrageenan/reduced graphene oxide/Ag composite (CA-RGO-Ag) by a wet chemical method at room temperature using carrageenan, graphene oxide and silver nitrate as starting materials. As-prepared composite was characterized by UV-vis spectroscopy, Raman spectroscopy, FTIR, SEM, EDX and XRD. Results showed that the reduction of graphene oxide (GO) and silver nitrate was achieved simultaneously by addition of NaBH 4 . Surface-enhanced Raman scattering study showed that the obtained composite give an intensive and enhanced Raman scattering when Rhodamine B was used as a probing molecule.

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Inorganic/Organic Multilayer Capsule Composition for Improved Functionality and External Triggering

Timin

Gao

Voronin

et al. 2016

Adv Materials Inter

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Polyelectrolyte (PE) and nanocomposite (NC) microcapsules fabricated by layer‐by‐layer technique have been of great interest in the past decade as novel entities for cargo encapsulation and delivery as well as for diagnostic purposes. The unique physicochemical properties of polymers and inorganic nanoparticles used in layer‐by‐layer synthesis of PE and NC microcapsules make them promising in various fields, such as storage, catalysis, cells imaging, controlled drug release, and targeted drug delivery. However, the requirement of the cargo encapsulation is that the cargo should have a relatively large molecular weight in order to avoid the leakage from the capsules. In this review, recent progress in the design and functionalization of PE and NC microcapsules using sol–gel method for storage of small cargos have been presented. Moreover, various remote exposures on the permeability of organic/inorganic composite microcapsule shells such as ultrasound, magnetic field gradient, laser, and microwave radiation have been observed. Finally, the description and discussion of the new trends and perspectives for improved functionality of PE microcapsules are the major topic of this progress report.

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Au@Ag core/shell cuboids and dumbbells: Optical properties and SERS response

Cited by 60 publications

References 62 publications

Surface-enhanced Raman scattering inside Au@Ag core/shell nanorods

Surface-enhanced Raman scattering inside Au@Ag core/shell nanorods

Facial Synthesis of Carrageenan/Reduced Graphene Oxide/Ag Composite as Efficient SERS Platform

Inorganic/Organic Multilayer Capsule Composition for Improved Functionality and External Triggering

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