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Univ. Paris-Saclay

Sujet de stage / Master 2 Internship

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Functionalization and assembly of gold nanoparticles for plasmonics and health

Contact: MARGUET Sylvie, , sylvie.marguet@cea.fr, +33 1 69 08 62 83
Engineer internship (bac+4, bac+5) or Master-2
We propose to fabricate two-dimensional nanostructures by self-assembly of gold nanocubes and to functionalize gold nanoparticles to make them biocompatible.
Possibility of continuation in PhD: Oui
Deadline for application:30/04/2022

Full description:
Our activity is focused on the synthesis and self-assembly of high quality gold nanoparticles for plasmonics, plasmon-driven chemistry and health. It is linked to the activities of two CNRS research groups, the GDRs Or-nano and Plasmonique active. The properties of gold nanohybrids, consisting of a gold nanoparticle and another component which can be either a molecule/ a semiconductor/ a Qdot, or a catalyst are studied in collaboration with expert teams through funded collaborations (ANR).

We have been developing for several years a know-how in colloidal synthesis of gold nanoparticles whose sizes/shapes and chemical coatings are optimized to generate light, heat or charge carriers, depending on the targeted application. The electromagnetic hot spots between gold nanocubes, organized in a two-dimensional (2D) array on a substrate, present unique high potential interstices ("nanogaps"), capable of exalting the light-matter interaction and generating electron-hole pairs ("hot carriers") in a very intense and highly localized manner. Moreover, gold nanoparticles are widely used for health in therapy/imaging/diagnosis. For these applications, it is often necessary to change the coating of the nanoparticles to render them biocompatible and/or functionalize them.

The internship will take place in the Laboratory EDifices NAnométriques (LEDNA) of CEA Paris-Saclay. It will consist in developing a 2D self-assembly know-how of gold nanoparticles at the interface between two liquids. In a second part, it will consist in coating them with a silica layer whose thickness and porosity can be modulated at will (sol-gel chemistry).
Technics/methods used during the internship:
Colloidal and sol-gel chemistry. Electron microscopies SEM and TEM. Extinction spectroscopy.

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