Authors
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Kuttner, C. ; Holler, R.P.M. ; Quintanilla, M. ; Schnepf, M. J. ; Dulle, M. ; Fery, A. ; Liz-Marzan, L. M.
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Title
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SERS and plasmonic heating efficiency from anisotropic core/satellite superstructures
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Date
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23.10.2019
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Number
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57247
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Abstract
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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.
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Publisher
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Nanoscale
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Wikidata
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Citation
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Nanoscale 11 (2019) 17655-17663
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DOI
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https://doi.org/10.1039/C9NR06102A
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Tags
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