Synthesis of Monodisperse Gold Nanoparticles for Plasmonics
Résumé
Our research activities concentrate on the synthesis and assembly of gold nanoparticles for plasmonics that is a rapidly growing discipline at the interface of physics, chemistry and biology with promising applications. We use a seed-mediated growth method of colloidal chemistry to synthesize gold nano-and micro-particles of controlled shape and size. This morphology control provides a fine tuning of the plasmon resonance wavelength and of the local field enhancement factor. Compared to top-down materials, these gold particles of high crystalline quality offer better surface-confinement of the electromagnetic field. The figure illustrates some of the monodis-perse gold NPs and gold nanohybrids we have been synthesized. Contrary to spherical and rod-shaped NPs that are commercially-available, other shapes such as nanocubes, na-notriangles and micro-plates with tunable sizes are only produced in our lab and in few laboratories worlwide, mainly in Asia. Triangles are of particular interest for ultrasensitive sensing, and plates (hexagonal or triangular) are very attractive for the construction of original plasmon-based optical devices due to their large atomically flat facets. At the present time, the synthesis of highly uniform triangles and plates still required purification steps that render them difficult to produce. Our research is made in collaboration with various research teams expert in the different field of plasmonics and aims at providing appropriate materials to study enhanced-photochemistry, enhanced-spectroscopy and nanosources of light. In the future, we are eager to widen the application range of these NPs to sensors and metamaterials through new expected collaborations.
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