Micelle-directed chiral seeded growth on anisotropic gold nanocrystals

González-Rubio, Guillermo and Mosquera, Jesús and Kumar, Vished and Pedrazo-Tardajos, Adrián and Llombart, Pablo and Solís, Diego M. and Lobato, Ivan and Noya, Eva G. and Guerrero-Martínez, Andrés and Taboada, José M. and Obelleiro, Fernando and MacDowell, Luis G. and Bals, Sara and Liz-Marzán, Luis M. (2020) Micelle-directed chiral seeded growth on anisotropic gold nanocrystals. Science (New York, N.Y.), 368 (6498). pp. 1472-1477. ISSN 0036-8075

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    Abstract

    Surfactant-assisted seeded growth of metal nanoparticles (NPs) can be engineered to produce anisotropic gold nanocrystals with high chiroptical activity through the templating effect of chiral micelles formed in the presence of dissymmetric cosurfactants. Mixed micelles adsorb on gold nanorods, forming quasihelical patterns that direct seeded growth into NPs with pronounced morphological and optical handedness. Sharp chiral wrinkles lead to chiral plasmon modes with high dissymmetry factors (~0.20). Through variation of the dimensions of chiral wrinkles, the chiroptical properties can be tuned within the visible and near-infrared electromagnetic spectrum. The micelle-directed mechanism allows extension to other systems, such as the seeded growth of chiral platinum shells on gold nanorods. This approach provides a reproducible, simple, and scalable method toward the fabrication of NPs with high chiral optical activity.