Photothermally heated colloidal synthesis of nanoparticles driven by silica-encapsulated plasmonic heat sources

Aritra Biswas, Nir Lemcoff, Ofir Shelonchik, Doron Yesodi, Elad Yehezkel, Ella Yonit Finestone, Alexander Upcher and Yossi Weizmann ()
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Aritra Biswas: Ben-Gurion University of the Negev
Nir Lemcoff: Ben-Gurion University of the Negev
Ofir Shelonchik: Ben-Gurion University of the Negev
Doron Yesodi: Ben-Gurion University of the Negev
Elad Yehezkel: Ben-Gurion University of the Negev
Ella Yonit Finestone: Ben-Gurion University of the Negev
Alexander Upcher: Ben-Gurion University of the Negev
Yossi Weizmann: Ben-Gurion University of the Negev

Nature Communications, 2023, vol. 14, issue 1, 1-12

Abstract: Abstract Using photons to drive chemical reactions has become an increasingly important field of chemistry. Plasmonic materials can provide a means to introduce the energy necessary for nucleation and growth of nanoparticles by efficiently converting visible and infrared light to heat. Moreover, the formation of crystalline nanoparticles has yet to be included in the extensive list of plasmonic photothermal processes. Herein, we establish a light-assisted colloidal synthesis of iron oxide, silver, and palladium nanoparticles by utilizing silica-encapsulated gold bipyramids as plasmonic heat sources. Our work shows that the silica surface chemistry and localized thermal hotspot generated by the plasmonic nanoparticles play crucial roles in the formation mechanism, enabling nucleation and growth at temperatures considerably lower than conventional heating. Additionally, the photothermal method is extended to anisotropic geometries and can be applied to obtain intricate assemblies inaccessible otherwise. This study enables photothermally heated nanoparticle synthesis in solution through the plasmonic effect and demonstrates the potential of this methodology.

Date: 2023
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DOI: 10.1038/s41467-023-42167-9

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