SERS and plasmonic heating efficiency from anisotropic core/satellite superstructures


The optical properties of nanoparticle assemblies can be tailored via hybridization of plasmon modes. Isotropic core/satellite superstructures made of spherical nanoparticles are known to exhibit coupled modes with a strongly scattering (radiative) character, and provide hot spots yielding high activity in surface-enhanced Raman scattering (SERS). However, to complement this functionality with plasmonic heating, additional absorbing (non-radiative) modes are required. We introduce herein anisotropic superstructures formed by decorating a central nanorod with spherical satellite nanoparticles, which feature two coupled modes that allow application for both SERS and heating. On the basis of diffuse reflectance spectroscopy, small-angle X-ray scattering (SAXS), and electromagnetic simulations, the origin of the coupled modes is disclosed and thus serves as a basis toward alternative designs of functional superstructures. This work represents a proof-of-principle for the combination of high SERS efficiency with efficient plasmonic heating by near-infrared irradiation.

Anisotropy, Efficiency, Electromagnetic simulation, Infrared devices, Nanoparticles, Nanorods, Optical properties, Plasmonics, Raman scattering, Surface scattering, X ray scattering
Kuttner, C., Höller, R. P. M., Quintanilla, M., Schnepf, M. J., Dulle, M., Fery, A., & Liz-Marzán, L. M. (2019). SERS and plasmonic heating efficiency from anisotropic core/satellite superstructures. 11(38).
CC BY-NC 3.0 Unported