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Heterogeneous Component Au (Outer)–Pt (Middle)–Au (Inner) Nanorings: Synthesis and Vibrational Characterization on Middle Pt Nanorings with Surface-Enhanced Raman Scattering

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    Heterogeneous Component Au (Outer)–Pt (Middle)–Au (Inner) Nanorings: Synthesis and Vibrational Characterization on Middle Pt Nanorings with Surface-Enhanced Raman Scattering
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    ACS Nano

    Cite this: ACS Nano 2022, 16, 7, 11259–11267
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    https://doi.org/10.1021/acsnano.2c04633
    Published July 14, 2022
    Copyright © 2022 American Chemical Society
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    Abstract

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    We report a synthetic approach for heterometallic (Au–Pt–Au) nanorings with intertwined triple rings (NITs), wherein three differently sized metal circular nanorings concentrically overlap in a single entity. The synthetic method allows one to control the component of core nanorings (Au or Pt) with a tunable gap distance. The narrow circular nanogaps between inner and outer Au rings strongly enhance the electromagnetic near-field via intraparticle coupling of localized surface plasmon resonance, which realizes surface-enhanced Raman scattering (SERS) at the single-particle level. Importantly, when the component of the middle ring is Pt, in situ SERS measurement for electrochemical reactions on Pt domains could be monitored with electrochemical potential variations due to the near-field focusing that is assisted by plasmonically active inner and outer Au nanorings, which is not feasible with pure Pt nanoparticle systems. The resulting NIT systems are robust and may benefit the synthesis of complicated nanostructures, giving myriad applications.

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    The Supporting Information is available free of charge at https://pubs.acs.org/doi/10.1021/acsnano.2c04633.

    • Materials, instrumentation, synthesis method, SEM images, TEM images, UV–vis–NIR spectra, EDS analysis, in situ electrochemical SERS spectra, single-particle SERS spectra, calculation of enhancement factor, electric-field enhancement contour map (PDF)

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    ACS Nano

    Cite this: ACS Nano 2022, 16, 7, 11259–11267
    Click to copy citationCitation copied!
    https://doi.org/10.1021/acsnano.2c04633
    Published July 14, 2022
    Copyright © 2022 American Chemical Society
    Request reuse permissions

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