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Au Octahedral Nanosponges: 3D Plasmonic Nanolenses for Near-Field Focusing

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    Au Octahedral Nanosponges: 3D Plasmonic Nanolenses for Near-Field Focusing
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    Journal of the American Chemical Society

    Cite this: J. Am. Chem. Soc. 2023, 145, 50, 27397–27406
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    https://doi.org/10.1021/jacs.3c08315
    Published December 11, 2023
    Copyright © 2023 American Chemical Society
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    Abstract

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    Here, we report the synthesis of three-dimensional plasmonic nanolenses for strong near-field focusing. The nanolens exhibits a distinctive structural arrangement composed of nanoporous sponge-like networks within their interior. We denote these novel nanoparticles as “Au octahedral nanosponges” (Au Oh NSs). Employing a carefully planned multistep synthetic approach with Au octahedra serving as sacrificial templates, we successfully synthesized Au Oh NSs in solution. The porous domains resembling sponges contributed to enhanced scattering and absorption of incident light within metal ligaments. This optical energy was subsequently transferred to the nanospheres at the vertex, where near-field focusing was maximized. We named this observed enhancement a “lightning-sphere effect”. Using single particle-by-particle surface-enhanced Raman scattering (SERS), we optimized the morphological dimensions of the spheres and porous domains to achieve the most effective near-field focusing. In the context of bulk SERS measurements targeting weakly adsorbing analytes (2-chloroethyl phenyl sulfide) in the gas phase, we achieved a low detection limit of 10 ppb. For nonadsorbing species (dimethyl methyl phosphonate), utilization of hybrid SERS substrates consisting of Au Oh NSs and metal–organic frameworks as gas-adsorbing intermediate layers was highly effective for successful SERS detection.

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    Supporting Information

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    The Supporting Information is available free of charge at https://pubs.acs.org/doi/10.1021/jacs.3c08315.

    • Experimental sections; FE-SEM images and UV–vis–NIR spectra of Au Oh NSs with different inner diameters; single-particle SERS measurements of Au Oh NPs and Au Oh tip-blobbed NFs; SERS-based detection of CEPS in the gas phase; XRD and IR spectra of Au Oh NSs, Au Oh NSs@ZIF-8, and ZIF-8; and SERS measurements of DMMP using bare Au Oh NSs and bare ZIF-8 films (PDF)

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    Journal of the American Chemical Society

    Cite this: J. Am. Chem. Soc. 2023, 145, 50, 27397–27406
    Click to copy citationCitation copied!
    https://doi.org/10.1021/jacs.3c08315
    Published December 11, 2023
    Copyright © 2023 American Chemical Society
    Request reuse permissions

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