Preparation of core–shell nanospheres of silica–silver: SiO2@Ag

Pérez-Flores, Juan Carlos; Torres, Víctor; Popa, Mónica; Crespo, Daniel; Calderón-Moreno, José Maria

doi:10.1016/j.jnoncrysol.2008.09.014

Cited by 51 publications

(31 citation statements)

References 26 publications

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“…[17][18][19] has been reported as well as various (mostly one-pot) synthesis strategies for capping with inorganic shells (e.g. silica, inorganic carbon) [20][21][22][23]. The main drawback in all of these aforementioned methods is that they do not present complete freedom to accurately control the shell thickness, though this is one of the most crucial parameters in many plasmonic applications such as SERS [12], where slight changes in shell thickness can alter the near field enhancement to a large extent.…”

Section: Introductionmentioning

confidence: 99%

Silver-polymer core-shell nanoparticles for ultrastable plasmon-enhanced photocatalysis

Asapu¹,

Claes²,

Bals³

et al. 2017

Applied Catalysis B: Environmental

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Graphical abstractHighlights  Ag-polymer-TiO2 composites show ultrastable photocatalytic activity in the long term  Ag-polymer core-shell nanoparticles prepared using affordable layer-by-layer method  Thin polymer shell prevents oxidation and clustering of the silver nanoparticles  Finite element simulations show retention of plasmonic near-field enhancement 3 ABSTRACT Affordable silver-polymer core-shell nanoparticles are prepared using the layer-by-layer (LbL) technique. The metallic silver core is encapsulated with an ultra-thin protective shell that prevents oxidation and clustering without compromising the plasmonic properties. The core-shell nanoparticles retain their plasmonic near field enhancement effect, as studied from finite element numerical simulations. Control over the shell thickness up to the sub-nanometer level is there for key. The particles are used to prepare a plasmonic Ag-TiO2 photocatalyst of which the gas phase photocatalytic activity is monitored over a period of four months. The described system outperforms pristine TiO2 and retains its plasmonic enhancement in contrast to TiO2 modified with bare silver nanoparticles. With this an important step is made toward the development of longterm stable plasmonic (photocatalytic) applications.

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Section: Introductionmentioning

confidence: 99%

Silver-polymer core-shell nanoparticles for ultrastable plasmon-enhanced photocatalysis

Asapu¹,

Claes²,

Bals³

et al. 2017

Applied Catalysis B: Environmental

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“…34 Increasingly, Ag modied SiO 2 core shell nanoparticles have been shown to have upgraded optical properties. 35,36 The core and thin shells of the nanoparticle structure could be expected to show excellent reactivity and stability for chemical looping and increased adsorption properties. This type of SiO 2 layer has the advantage of being a template free structure, with a higher adsorption capacity, so has more oen been used as a core layer in recent years.…”

Section: -32mentioning

confidence: 99%

The production of an efficient visible light photocatalyst for CO oxidation through the surface plasmonic effect of Ag nanoparticles on SiO₂@α-Fe₂O₃ nanocomposites

et al. 2018

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A process for the photo deposition of noble Ag nanoparticles on a core-shell structure of SiO 2 @a-Fe 2 O 3 nanocomposite spheres was performed to produce a CO photo oxidation catalyst. The structural analyses were carried out for samples produced using different Ag metal nanoparticle weight percentages on SiO 2 @a-Fe 2 O 3 nanocomposite spheres by X-ray diffraction (XRD), field emissionscanning electron microscopy (FE-SEM), UV-vis spectroscopy, Raman spectroscopy and Fourier transform infrared spectroscopy (FTIR). A computational study was also performed to confirm the existence of the synergic effect of surface plasmon resonance (SPR) for different weight percentages of Ag on the SiO 2 @a-Fe 2 O 3 nanocomposites. The mechanism for CO oxidation on the catalyst was explored using diffuse reflectance infrared Fourier transform spectroscopy (DRFIT). The CO oxidation results for the Ag (2 wt%)-SiO 2 @a-Fe 2 O 3 nanocomposite spheres showed 48% higher photocatalytic activity than a-Fe 2 O 3 and SiO 2 @a-Fe 2 O 3 at stable temperature.

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“…Hollow silica nanoparticles were prepared by the Stöber's process [9][10][11]. In one-pot process, the following reactants were added: 1 g of PVP, 1.115 mL of TEOS for synthesis (98% purity, Sigma-Aldrich, Barcelona, Spain), 25 mL of absolute ethanol (Panreac, Barcelona, Spain), and 9 mL of deionised water.…”

Section: Hollow Sio 2 Nanoparticlesmentioning

confidence: 99%

“…The sol-gel reaction taking place implies the hydrolysis of TEOS followed by the polycondensation of silanol groups [8][9][10][11].…”

Section: Introductionmentioning

confidence: 99%

“…There are some papers about the use of AgNPs in waterborne adhesives [12][13][14] and also about the synthesis of silver-silica nanocomposites [5,10,11,15]; however, no literature was found which combines the use of silver-silica nanocomposites to confer antimicrobial properties to waterborne polyurethane adhesives. Therefore, the main objective of this study is the synthesis of AgNPs@silica composites and the evaluation of the properties of waterborne polyurethane adhesives (WPU) based on AgNPs@silica nanocomposites, as well as the possible interactions between silver nanocomposites and the polyurethane matrix.…”

Section: Introductionmentioning

confidence: 99%

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Novel Waterborne Polyurethane Adhesives Based on Ag@SiO₂Nanocomposites

Pérez-Limiñana¹,

Arán-Aı́s²,

Orgilés-Barceló³

2014

The Journal of Adhesion

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In this work, the use of silver-based silica nanocomposites (Ag@SiO 2 ) was proposed to inhibit the microorganism growth of waterborne polyurethane adhesives. For that purpose, colloidal silver nanoparticles were prepared and embedded in a SiO 2 -based matrix in order to decrease the silver aggregation tendency. The protection of AgNPs with silica was also intended to improve the stability of the adhesive toward metallic particles. Last but not least, Ag@SiO 2 provides safer handling of the silver nanoparticles due to their immobilisation within the silica matrix. Colloidal silver was prepared by the Creigthon method using NaBH 4 as a reducing agent and polyvinylpyrrolidone (PVP) as a stabilising agent. The coating of the AgNPs by the silica matrix was achieved through a modified Sto¨ber process. The stability of the AgNPs in different amino-based catalysts for the silica matrix synthesis was evaluated in order to successfully obtain silversilica core-shell nanocomposites. After that, AgNPs and Ag@SiO 2 nanocomposites were incorporated in a waterborne polyurethane adhesive and the chemical, thermal adhesion and antimicrobial properties were evaluated.

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Preparation of core–shell nanospheres of silica–silver: SiO2@Ag

Cited by 51 publications

References 26 publications

Silver-polymer core-shell nanoparticles for ultrastable plasmon-enhanced photocatalysis

Silver-polymer core-shell nanoparticles for ultrastable plasmon-enhanced photocatalysis

The production of an efficient visible light photocatalyst for CO oxidation through the surface plasmonic effect of Ag nanoparticles on SiO₂@α-Fe₂O₃ nanocomposites

Novel Waterborne Polyurethane Adhesives Based on Ag@SiO₂Nanocomposites

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Preparation of core–shell nanospheres of silica–silver: SiO2@Ag

Cited by 51 publications

References 26 publications

Silver-polymer core-shell nanoparticles for ultrastable plasmon-enhanced photocatalysis

Silver-polymer core-shell nanoparticles for ultrastable plasmon-enhanced photocatalysis

The production of an efficient visible light photocatalyst for CO oxidation through the surface plasmonic effect of Ag nanoparticles on SiO2@α-Fe2O3 nanocomposites

Novel Waterborne Polyurethane Adhesives Based on Ag@SiO2Nanocomposites

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The production of an efficient visible light photocatalyst for CO oxidation through the surface plasmonic effect of Ag nanoparticles on SiO₂@α-Fe₂O₃ nanocomposites

Novel Waterborne Polyurethane Adhesives Based on Ag@SiO₂Nanocomposites