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Nanoparticles embedded in Dielectrics - Ion Beam Synthesis

A specificity of the NeO group lies in the design by ion implantation at low energy through micrometric masks of model systems formed of a 2D arrays of small nanoparticles (metallic or semiconducting).

The nanoparticles are located a few nm from the free surface of a dielectric matrix (silica or silicon nitride). The matrix protects nanoparticles from aging as well as possible dissemination. It maintains the flatness of the surface, on which we can deposit the objects of interest that we want to study the coupling with the embedded nanoparticles.

Different architectures have been synthesised in the laboratory, involving either Ag nanoparticles (AgNPs), which are used for their plasmonic properties and whose toxicity has also been studied, or, more recently, Si nanoparticles (SiNPs).

Coupling of the Ag nanoparticles with graphene

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The twofold role of a single plane of AgNPs as embedded plasmonic enhancer and charge carrier reservoir has been demonstrated on few-layer graphene located in dedicated areas at a controlled nanometer distance from the AgNPs.

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Coupling the AgNPs with light emitters

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The AgNPs were also coupled to light emitters (Si nanocrystals) co-implanted in the same matrix, leading to an exaltation of their photoluminescence.

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Study of the toxicity of embedded AgNPs on green algae

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The biocide activity and toxicity of AgNPs embedded in silica was evaluated using an original method based on the degradation of photosynthesis of a green alga

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Doped Si nanocrystals for plasmonics

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The discovery of localized surface plasmon resonances (LSPR) in doped semiconductor nanocrystals (NCs) has opened a new field in plasmonics. Hence, doped semiconductor nanoparticles can also be the seat of surface plasmon resonances in the infra-red range, whose frequency can be adjusted with the doping rate. Hence SiNPs embedded in silica matrices could advantageously replace metallic NPs, for an alternative “metal free” plasmonic, " and covering a new frequency domain.

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Publications

Theory of plasmonic properties of hyper-doped silicon nanostructures, C Majorel, V Paillard, A Patoux, PR Wiecha, A Cuche, A Arbouet, C. Bonafos and C. Girard, Optics Communications 453, 124336 (...)

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