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Quantitatively linking morphology and optical response of individual silver nanohedra

Wang, Yisu, Sztranyovszky, Zoltan, Zilli, Attilio, Albrecht, Wiebke, Bals, Sara, Borri, Paola ORCID: https://orcid.org/0000-0002-7873-3314 and Langbein, Wolfgang ORCID: https://orcid.org/0000-0001-9786-1023 2022. Quantitatively linking morphology and optical response of individual silver nanohedra. Nanoscale 14 (30) , 11028. 10.1039/D2NR02131E

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Abstract

The optical response of metal nanoparticles is governed by plasmonic resonances, which are dictated by the particle morphology. A thorough understanding of the link between morphology and optical response requires quantitatively measuring optical and structural properties of the same particle. Here we present such a study, correlating electron tomography and optical micro-spectroscopy. The optical measurements determine the scattering and absorption cross-section spectra in absolute units, and electron tomography determines the 3D morphology. Numerical simulations of the spectra for the individual particle geometry, and the specific optical set-up used, allow for a quantitative comparison including the cross-section magnitude. Silver nanoparticles produced by photochemically driven colloidal synthesis, including decahedra, tetrahedra and bi-tetrahedra are investigated. A mismatch of measured and simulated spectra is found in some cases when assuming pure silver particles, which is explained by the presence of a few atomic layers of tarnish on the surface, not evident in electron tomography. The presented method tightens the link between particle morphology and optical response, supporting the predictive design of plasmonic nanomaterials.

Item Type: Article
Date Type: Published Online
Status: Published
Schools: Physics and Astronomy
Biosciences
Publisher: Royal Society of Chemistry
ISSN: 2040-3364
Funders: EPSRC
Date of First Compliant Deposit: 9 August 2022
Date of Acceptance: 8 July 2022
Last Modified: 30 Nov 2022 08:29
URI: https://orca.cardiff.ac.uk/id/eprint/151706

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