In situ construction of gold nanostructured metamaterials on a scaffold architecture

초록

Nanostructured metamaterials made up of gold particles with a few nanometer size (AuNPs) could create unprecedented electromagnetic phenomena within visible spectrum, which makes them highly promising for bridging the gap between plasmonic and photonic technologies; however, their construction remains a major challenge. Here, we report successful, in situ construction of such gold nanostructured metamaterials (i.e. circular chain-or ring-shaped gold nanostructures with a diameter below 30 nm) using a strategically designed scaffold architecture, which is structurally uniform, tobacco mosaic virus capsid-derived protein with a toroidal shape and enables precise growth and spatial organization of individual AuNPs on its surface. Notably, the constructed chain-or ring-shaped gold nanostructures exhibited pronounced plasmonic mode splitting in visible light zone, remarkable surface-enhanced Raman scattering performance, and also significant photothermal or magnetic properties. This unique metamaterial nanostructures and characteristics and multimodal nature offer extraordinary potential for a variety of emerging, advanced photonic and/or plasmonic applications.

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