Synthesis, optical properties, and modeling of silver core/silver oxide shell nanostructures in silica films

Rentería-Tapia, Víctor; Valverde-Aguilar, Guadalupe; García-Macedo, Jorge A.

doi:10.1117/12.730870

Cited by 4 publications

(7 citation statements)

References 16 publications

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“…Moreover, there are a series of protocols for further chemical modification of the silica shell. Colloidal, optical, − and catalytic − properties of such hybrids can thus be tailored rather precisely, as has for example been shown for photonic crystals. − …”

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confidence: 99%

“…Moreover, there are a series of protocols for further chemical modification of the silica shell. Colloidal, 19 optical, [20][21][22] and catalytic [23][24][25] properties of such hybrids can thus be tailored rather precisely, as has for example been shown for photonic crystals. [26][27][28] Unfortunately, many nanoparticles are relatively difficult to coat with a silica layer of uniform thickness and density.…”

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confidence: 99%

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Silicification of Peptide-Coated Silver Nanoparticles—A Biomimetic Soft Chemistry Approach toward Chiral Hybrid Core−Shell Materials

et al. 2011

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Silica and silver nanoparticles are relevant materials for new applications in optics, medicine, and analytical chemistry. We have previously reported the synthesis of pH responsive, peptide-templated, chiral silver nanoparticles. The current report shows that peptide-stabilized nanoparticles can easily be coated with a silica shell by exploiting the ability of the peptide coating to hydrolyze silica precursors such as TEOS or TMOS. The resulting silica layer protects the nanoparticles from chemical etching, allows their inclusion in other materials, and renders them biocompatible. Using electron and atomic force microscopy, we show that the silica shell thickness and the particle aggregation can be controlled simply by the reaction time. Small-angle X ray scattering confirms the Ag/peptide@silica core-shell structure. UV-vis and circular dichroism spectroscopy prove the conservation of the silver nanoparticle chirality upon silicification. Biological tests show that the biocompatibility in simple bacterial systems is significantly improved once a silica layer is deposited on the silver particles.

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Silicification of Peptide-Coated Silver Nanoparticles—A Biomimetic Soft Chemistry Approach toward Chiral Hybrid Core−Shell Materials

et al. 2011

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“…The scheme of the core-shell structure further allows a tunable optical response of the composite system, by adding additional degree of freedom of the shell composition and thickness. Xu et al [6] reported the synthesis of a Fe 3 O 4 -Au/Ag structure with tunable plasmonic resonant frequency, while Renteria-Tapia et al [13] measured the absorption spectra of Ag-Ag 2 O nanostructures grown on silica thin films.…”

Section: Introductionmentioning

confidence: 99%

Near-field optical effect of a core-shell nanostructure in proximity to a flat surface

Cui

Dai

et al. 2014

The Journal of Chemical Physics

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Abstract.We provide an analytical solution to study the near field optical effect of a core-shell nanostructure in proximity to a flat surface, within quasi-static approximation. The distribution of electrostatic potential and field enhancement in this complex geometry are obtained by solving a set of linear equations. This analytical result can be applied to a wide range of systems associated with near field optics and surface plasmon polaritons. As an illustration of the power of this technique, we study the field attenuation effect of oxidized shell in a silver tip in near field scanning microscope. The thickness of oxidized layer can be monitored by measuring the light intensity. In addition, we propose a novel method to detect local temperature with spatial resolution down to nm scale, based on a Ag-Au core-shell structure.

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“…Clearly, there is a (poly)crystalline core (silver, lattice spacing in the HRTEM images of 2. 22 A, (111) reflection) coated with an 1-2 nm amorphous layer (silica). HRTEM also shows that the smaller nanoparticles within the silica shell are not amorphous, but crystalline, and have a diameter of up to 10 nm.…”

Section: Nanoparticle Synthesis and Structurementioning

confidence: 99%

“…This is typically done via coating with thiols or an inert inorganic coating like silica. 20 Silica has many advantages as the chemical behaviour (and the resulting structures), surface modification, and properties (colloidal, 21 optical, [22][23][24] etc.) can be accurately controlled.…”

Section: Introductionmentioning

confidence: 99%

Biomimetic synthesis of chiral erbium-doped silver/peptide/silica core-shell nanoparticles (ESPN)

et al. 2011

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Peptide-modified silver nanoparticles have been coated with an erbium-doped silica layer using a method inspired by silica biomineralization. Electron microscopy and small-angle X-ray scattering confirm the presence of an Ag/peptide core and silica shell. The erbium is present as small Er(2)O(3) particles in and on the silica shell. Raman, IR, UV-Vis, and circular dichroism spectroscopies show that the peptide is still present after shell formation and the nanoparticles conserve a chiral plasmon resonance. Magnetic measurements find a paramagnetic behavior. In vitro tests using a macrophage cell line model show that the resulting multicomponent nanoparticles have a low toxicity for macrophages, even on partial dissolution of the silica shell.

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Synthesis, optical properties, and modeling of silver core/silver oxide shell nanostructures in silica films

Cited by 4 publications

References 16 publications

Silicification of Peptide-Coated Silver Nanoparticles—A Biomimetic Soft Chemistry Approach toward Chiral Hybrid Core−Shell Materials

Silicification of Peptide-Coated Silver Nanoparticles—A Biomimetic Soft Chemistry Approach toward Chiral Hybrid Core−Shell Materials

Near-field optical effect of a core-shell nanostructure in proximity to a flat surface

Biomimetic synthesis of chiral erbium-doped silver/peptide/silica core-shell nanoparticles (ESPN)

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