Controlled Deposition of Silver Nanoparticles in Mesoporous Single‐ or Multilayer Thin Films: From Tuned Pore Filling to Selective Spatial Location of Nanometric Objects

Fuertes, M. Cecilia; Marchena, Martín Hernán; Marchi, M. Claudia; Wolosiuk, Alejandro; Soler-Illia, Galo J. A. A.

doi:10.1002/smll.200800894

Cited by 92 publications

(106 citation statements)

References 48 publications

(51 reference statements)

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“…Moreover, the close contact of adjacent silver particles could also be invoked. 56,69 So, it is certainly quite difficult to clearly correlate a frequency of the SPR to the silver nanocrystals size, because a lot of contributions whith contradictory effects are involved.…”

Section: Discussionmentioning

confidence: 99%

Chemical Growth and Photochromism of Silver Nanoparticles into a Mesoporous Titania Template

et al. 2009

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Elaboration of mesoporous titanium oxide film supporting silver nanoparticles is described. Mesoporous titanium oxide films are characterized by TEM analysis. Titania films are infiltrated with a silver salt solution and chemical reduction treatments are performed using either a NaBH(4) or a formaldehyde solution. Infiltrated films are then characterized by TEM, SEM, AFM, UV-visible spectroscopy, X-ray diffraction, and Rutherford Backscattering Spectrometry (RBS). The utilization of a mesoporous titania substrate allows to control the nanoparticle size and the interparticle distance. RBS experiments provide the evidence that NaBH(4) treatment induces a strong accumulation of silver nanoparticles in the subsurface of the layer, while formaldehyde treatment induces the formation of silver nanoparticles embedded into almost the whole depth of the titania film. Large silver nanocrystals are also formed at the film surface whatever the reducer used. A broad visible absorption band related to the surface plasmon resonance (SPR) is obtained in both cases and is strongly red-shifted compared to the SPR obtained for silver nanoparticles inside a silica matrix. Moreover, irradiation with visible light causes the photooxidation of silver nanoparticles by titania and a complete discoloration of the material. The photooxidation is related to a drastic decrease in the silver nanoparticle size and is found to be reversible, particularly in the case of the material obtained by the formaldehyde reduction.

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Section: Discussionmentioning

confidence: 99%

Chemical Growth and Photochromism of Silver Nanoparticles into a Mesoporous Titania Template

et al. 2009

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“…(3). For T = 298 K, pH 5.5 I = 10 −2 M (Morga and Adamczyk 2013) Geometrical cross-section area (nm 2 )155Adamczyk et al (2006)Silver Specific density (g cm −3 )10.49Literature data (Fuertes et al 2009) Average particle size (nm)28 ± 4From size distribution derived from TEM micrographs (Oćwieja et al 2013) Average particle size (nm)29 ± 5From size distribution derived from AFM images (Oćwieja et al 2013) Diffusion coefficient (cm 2 s −1 )1.48 × 10 −7 Determined by DLS for T = 298 K, pH 6.2 I = 5 × 10 −2 –0.03 M NaCl Hydrodynamic diameter (nm)29 ± 5Calculated from Eq. (3) (Oćwieja et al 2013) Plasmon absorption maximum (nm)400Measured for pH 6.2 I = 10 −2 M NaCl and silver sol concentration, c b = 5–25 mg L −1 (Oćwieja et al 2013)Geometrical cross-section area (nm 2 )615Calculated from geometry (Oćwieja et al 2013)…”

Section: Resultsmentioning

confidence: 99%

Stability of silver nanoparticle monolayers determined by in situ streaming potential measurements

2013

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A silver particle suspension obtained by a chemical reduction was used in this work. Monolayers of these particles (average size 28 nm) on mica modified by poly(allylamine hydrochloride) were produced under diffusion-controlled transport. Monolayer coverages, quantitatively determined by atomic force microscopy (AFM) and SEM, was regulated by adjusting the nanoparticle deposition time and the suspension concentration. The zeta potential of the monolayers was determined by streaming potential measurements carried out under in situ (wet) conditions. These measurements performed for various ionic strengths and pH were interpreted in terms of the three-dimensional (3D) electrokinetic model. The stability of silver monolayers was also investigated using streaming potential and the AFM methods. The decrease in the surface coverage of particles as a function of time and ionic strength varied between 10−1 and 10−4 M was investigated. This allowed one to determine the equilibrium adsorption constant Ka and the binding energy of silver particles (energy minima depth). Energy minima depth were calculated that varied between −18 kT for I = 10−1 M and −19 kT for I = 10−4 for pH 5.5 and T = 298 K. Our investigations suggest that the interactions between surface and nanoparticles are controlled by the electrostatic interactions among ion pairs. It was also shown that the in situ electrokinetic measurements are in accordance with those obtained by more tedious ex situ AFM measurements. This confirmed the utility of the streaming potential method for direct kinetic studies of nanoparticle deposition/release processes.Graphical Abstract

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“…Mesoporous oxides have shown to be an ideal matrix for growing a large variety of nanoparticles (NPs), ranging from transition metal and metal oxide NPs [6,7], quantum dots [8,9] and particles bearing plasmonic properties [10][11][12][13][14]. In particular, we have recently shown that deep X-ray lithography can be efficiently used as a top-down lithographic method for the nucleation of ceria nanoparticles in the pores of a pre-formed titania matrix [15].…”

Section: Introductionmentioning

confidence: 99%

In situ growth of Ag nanoparticles in graphene–TiO2 mesoporous films induced by hard X-ray

Malfatti

Carboni

Pinna

et al. 2016

J Sol-Gel Sci Technol

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The controlled growth of Ag nanoparticles into graphene-TiO 2 mesoporous films has been triggered by hard X-ray exposure provided by a synchrotron storage ring. The kinetic process has been studied by UV-visible spectroscopy as a function of the X-ray dose and compared to the nanoparticle growth induced in a bare mesoporous titania matrix. The graphene layers act as a preferential nucleation sites, allowing a faster nucleation of the nanoparticles. Moreover, the growth of larger nanoparticles is also promoted as a function of the exposure dose. The combined bottom-up and top-down approach to fabricate nanocomposites porous films embedding both graphene and plasmonic nanoparticles is expected to be a fundamental tool for the design of new analytical platforms based on the enhancement of the Raman signals. Graphical Abstract

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Controlled Deposition of Silver Nanoparticles in Mesoporous Single‐ or Multilayer Thin Films: From Tuned Pore Filling to Selective Spatial Location of Nanometric Objects

Cited by 92 publications

References 48 publications

Chemical Growth and Photochromism of Silver Nanoparticles into a Mesoporous Titania Template

Chemical Growth and Photochromism of Silver Nanoparticles into a Mesoporous Titania Template

Stability of silver nanoparticle monolayers determined by in situ streaming potential measurements

In situ growth of Ag nanoparticles in graphene–TiO2 mesoporous films induced by hard X-ray

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