Two dimensional dipolar coupling in monolayers of silver and gold nanoparticles on a dielectric substrate

Liu, Yu; Pichon, Benoît P.; Leuvrey, Cédric; Ihiawakrim, Dris; Rastei, M. V.; Schmerber, G.; Vomir, M.; Bigot, J.-Y.

doi:10.1039/c4nr03292f

Cited by 12 publications

(10 citation statements)

References 35 publications

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“…The absorption spectra show a broad peak with a maximum at a wavelength of about 580 nm. According to published data [57,58], such absorption is characteristic of particles with an average diameter of 20-30 nm, which confirms the SEM data. It should be noted that the average pore size in the PG membrane is 25 nm, so the average size of gold nanoparticles cannot exceed this value.…”

Section: Glass/au Composite Membranes Synthesis and Analysissupporting

confidence: 88%

Glass/Au Composite Membranes with Gold Nanoparticles Synthesized inside Pores for Selective Ion Transport

Лебедев¹,

Novomlinsky²,

Kochemirovsky³

et al. 2020

Materials

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4Grebenshchikov Institute of Silicate Chemistry (ISCh) RAS, 2 Adm. Makarova emb., St Petersburg 199155, Russia; anfimova-i@mail.ru (I.A.); antr2@yandex.ru (T.A.) Abstract: Nanocomposite membranes have been actively developed in the last decade. The involvement of nanostructures can improve the permeability, selectivity, and anti-fouling properties of a membrane for improved filtration processes. In this work, we propose a novel type of ion-selective Glass/Au composite membrane based on porous glass (PG), which combines the advantages of porous media and promising selective properties. The latter are achieved by depositing gold nanoparticles into the membrane pores by the laser-induced liquid phase chemical deposition technique. Inside the pores, gold nanoparticles with an average diameter 25 nm were formed, which was confirmed by optical and microscopic studies. To study the transport and selective properties of the PG/Au composite membrane, the potentiometric method was applied. The uniform potential model was used to determine the surface charge from the experimental data. It was found that the formation of gold nanoparticles inside membrane pores leads to an increase in the surface charge from −2.75 mC/m 2 to −5.42 mC/m 2 . The methods proposed in this work allow the creation of a whole family of composite materials based on porous glasses. In this case, conceptually, the synthesis of these materials will differ only in the selection of initial precursors.Nanocomposite membranes have been actively developed in the last decade [17]. The involvement of nanostructures can improve the permeability, selectivity, and anti-fouling properties of a membrane for improved filtration processes. One of the most promising approaches to producing such composite materials is the formation of nanoparticles inside the porous structure of a membrane. As with nanotechnology in general [18], there are two main methods [17] for the formation of nanoparticles inside the membranous pores: "top down"-bulk modification through blending (called mixed-matrix membranes) and "bottom up"-surface modification. In the fabrication of bulk-modified nanocomposite membranes, the nanoparticles are dispersed in a homogeneous polymeric precursor solution before the final formation process [19]. However, this method is difficult to use, for example, in the synthesis of inorganic solid membranes. The surface modification technique is the most convenient method in this case [11]. The surface modification technique deals with deposition of nanoparticles onto a membrane.Silicate (high silica) porous glasses (PGs) are channel-type nanostructures [20] with thermal, chemical and microbiological stability, in combination with controlled surface structural characteristics [21][22][23]. Special attention is worth paying to the PG application for the separation of liquid mixtures by reverse osmosis. This method has found application in water desalination, sanitary household water cleaning, water regeneration from vital function products in space, radioactive ...

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Section: Glass/au Composite Membranes Synthesis and Analysissupporting

confidence: 88%

Glass/Au Composite Membranes with Gold Nanoparticles Synthesized inside Pores for Selective Ion Transport

Лебедев¹,

Novomlinsky²,

Kochemirovsky³

et al. 2020

Materials

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“…[9][10][11] On the basis of reflectivity spectra of Ag NCs self-assembled in 2D superstructures onto a graphite substrate exposed to p-polarized light (polarization parallel to the incidence plane), collective optical properties were found from the emergence of additional plasmonic features in their spectra compared to those of similar NCs dispersed in solution. 5,12 Besides, the substrate effect on the reflectivity spectra of 2D selfassemblies of Ag NCs was also investigated by using various substrates, namely, highly oriented pyrolytic graphite (HOPG), gold, silicon, and Al 0.7 Ga 0.3 As. 13 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 Recently, using the discrete dipole approximation (DDA) method, the absorption spectra of well-ordered 2D assemblies of ultrafine Ag and Au nanospheres were simulated for different interparticle distances and incidence angles.…”

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confidence: 99%

Collective Surface Plasmon Resonances in Two-Dimensional Assemblies of Au and Ag Nanocrystals: Experiments and Discrete Dipole Approximation Simulation

et al. 2016

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The UV-visible absorption spectra of two-dimensional (2D) assemblies of Ag or Au nanocrystals (NCs) are measured in transmission at variable incidence angle, for different average NC diameters ranging from 7.0 nm to 3.9 nm. The absorption spectra dominated by the collective surface plasmon resonance (SPR) absorption band are compared to those calculated using the discrete dipole approximation (DDA) method. The anisotropy of the optical response is inherent to the planar geometry of the NC assembly because of the near-field coupling between nanocrystals. For Ag NCs, the absorption spectra reveal the splitting of the SPR band into two components, namely, the transverse and longitudinal modes. At variance, no SPR band splitting is observed for 2D assemblies of Au NCs with identical size and coating agent. These features were satisfactorily reproduced by DDA simulation even though the SPR mode energies deduced from our calculations slightly overestimate the measured ones. The influence of the coating dodecanethiol molecules on the electron refractive index inside the nanocrystals as well as that of the substrate could explain the mismatch between the measured and calculated spectra.

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“…These formulations are known to approximate well the effective response (and hence the optical absorption signal) of composite media comprising noninteracting metal NPs. (66,67) Finally, the Voigt model ( 68) was used for the calculation of the nondiagonal components of the dielectric tensor ε̃ from which the time-dependent magnetic signal can be obtained , leading to an estimation of the MCD signal.…”

Section: Modeling the Magneto-optical Responsementioning

confidence: 99%

Chiromagnetoptics of Au and Ag Nanoparticulate Systems

et al. 2020

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Photoelectron excitations into unoccupied energy states are fundamental in solid-state physics and many modern applications. The operation of such internal electronic transitions relies not only on photon absorption efficiency, which is pivotal in sensing, photovoltaics, active plasmonics, etc., but also on light-matter interactions and near/far-field spectroscopic techniques. Here, we report on a spectroscopic absorption fingerprint in magnetic circular dichroism (MCD) responses of various nanoparticulate systems. MCD spectra acquired at low temperatures on assemblies of uncoupled/coupled Ag and Au nanoparticles reveal asymmetric MCD spectral line shapes strongly depending on the nature and shape of nanoparticles and on their interparticular interactions. Assembling for instance the NPs into 2D networks with interparticle distances allowing dipolar interactions or transforming the spherical nanoparticles into disks was found to significantly alter the magneto-optic response in the spectral line shape. The findings are interpreted within the framework of chiral magneto-plasmonic effects by considering the k-dependent electronic states involved in both inter-and intraband electronic transitions.

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Two dimensional dipolar coupling in monolayers of silver and gold nanoparticles on a dielectric substrate

Cited by 12 publications

References 35 publications

Glass/Au Composite Membranes with Gold Nanoparticles Synthesized inside Pores for Selective Ion Transport

Glass/Au Composite Membranes with Gold Nanoparticles Synthesized inside Pores for Selective Ion Transport

Collective Surface Plasmon Resonances in Two-Dimensional Assemblies of Au and Ag Nanocrystals: Experiments and Discrete Dipole Approximation Simulation

Chiromagnetoptics of Au and Ag Nanoparticulate Systems

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