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Silicon based core @shell nanoparticles: synthesis and assembly into metamaterials for unprecedented optical properties
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- Author(s) / Creator(s)
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Embassy of France FCRF awarded 2022: This project aims to we aim to synthesise, via bottom-up approaches, silicon-based core@shell particles containing gold. Here the intense electric dipole scattering from the plasmonic resonance will be overlapped with the magnetic dipolar resonance stemming from the silicon. Combining crystalline silicon with plasmonic materials in a core-shell particle structure is expected to generate singular optical properties. Feng et al. (14) introduced in a theoretical study the concept of ideal magnetic dipole scattering for Au@Si nanoparticles. The same team also previously predicted significant modulation of the electric and magnetic dipole of silicon nanoparticles coated with an ultrathin layer of gold (15). Another theoretical study demonstrated the non-linear optical properties of Au@Si nanoparticles (16). However, the experimental synthesis of such systems is only reported in few papers and remains challenging. A recent study reported the colloidal preparation of Si@Au core-shell nanoparticles using milling to produce the Si core (17). While this study overcame the challenge of attaching gold to the silicon nanoparticle surface by chemical means, the core@shell structures present suboptimal optical scattering. This resulted from the Si cores being irregular in shape, and the shell of gold being discontinuous and inhomogeneous. Improving the chemical routes toward preparation of such core shell systems would produce materials with the desired optical properties.
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- Date created
- 2022-06-01
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- Type of Item
- Research Material
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- License
- ©️Veinot, Jonathan. All rights reserved other than by permission. This document embargoed to those without UAlberta CCID until 2027.