AI Article Synopsis
- The study explores the SERS efficiency of arrays made from self-organized gold (Au) nanocrescents on polystyrene nanospheres.
- A significant SERS emission in the visible spectrum occurs due to the excitation of a localized surface plasmon resonance along the short axis of the nanocrescents, achieving SERS signal amplifications around 10^3 times compared to a flat gold film.
- The researchers investigate how changing the amount of metal on the polymer spheres affects the plasmonic response, demonstrating that the SERS emission can be tailored by modifying the shape of the nanocrescents and highlighting the role of satellite nanoclusters in enhancing the resonances.
Article Abstract
We report on the surface-enhanced Raman scattering (SERS) efficiency of self-organized arrays of Au nanocrescents confined on monolayers of polystyrene nanospheres. A dichroic SERS emission in the visible spectrum is observed due to the selective excitation of a localized surface plasmon (LSP) resonance along the "short axis" of the Au nanocrescents. Under these conditions SERS signal amplifications in the range of 10(3) have been observed with respect to a flat reference Au film. The far field and near field plasmonic response of Au nanocrescent arrays have been investigated as a function of the metal dose deposited onto the polymeric spheres. In this way, we show the possibility of simply tailoring the SERS emission by engineering the morphology of the plasmonic nanocrescents. We highlight the SERS activity of chains of satellite nanoclusters that decorate the border of each connected crescent and sustain isotropic high energy LSP resonances in the visible spectrum.
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| http://dx.doi.org/10.1021/acsami.5b11843 | DOI Listing |
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