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Issue 21, 2014
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Exploring the benefits of electron tomography to characterize the precise morphology of core–shell Au@Ag nanoparticles and its implications on their plasmonic properties

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Abstract

In the design and engineering of functional core–shell nanostructures, material characterization at small length scales remains one of the major challenges. Here we show how electron tomography in high-angle annular dark-field scanning transmission electron microscopy (HAADF-STEM) mode can be applied successfully to perform nano-metrological characterization of Au@Ag core–shell nanostructures. This work stresses the benefits of HAADF-STEM tomography and its use as a novel and rigorous tool for understanding the physical–chemical properties of complex 3D core–shell nanostructures. The reconstructed Au@Ag core–shell architecture was used as an input for discrete dipole approximation (DDA)-based electrodynamics simulations of the optical properties of the nanostructures. The implications of localized surface plasmon spectroscopy as well as Raman-enhanced spectroscopy are analysed.

Graphical abstract: Exploring the benefits of electron tomography to characterize the precise morphology of core–shell Au@Ag nanoparticles and its implications on their plasmonic properties

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The article was received on 02 Jun 2014, accepted on 19 Aug 2014 and first published on 21 Aug 2014


Article type: Paper
DOI: 10.1039/C4NR03017F
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Nanoscale, 2014,6, 12696-12702

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    Exploring the benefits of electron tomography to characterize the precise morphology of core–shell Au@Ag nanoparticles and its implications on their plasmonic properties

    J. C. Hernández-Garrido, M. S. Moreno, C. Ducati, L. A. Pérez, P. A. Midgley and E. A. Coronado, Nanoscale, 2014, 6, 12696
    DOI: 10.1039/C4NR03017F

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