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Structure-dependent SERS activity of plasmonic nanorattles with built-in electromagnetic hotspots

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Abstract

Hollow plasmonic nanostructures with built-in and accessible electromagnetic hotspots such as nanorattles, obtained through a galvanic replacement reaction, have received wide attention in chemical and biological sensing and targeted drug delivery. In this study, we investigate the surface enhanced Raman scattering (SERS) activity of plasmonic nanorattles obtained through different degrees of galvanic replacement of Au@Ag nanocubes. We found that the SERS efficacy of the nanorattles is governed by the plasmon extinction intensity, localized surface plasmon resonance (LSPR) wavelength of the nanostructures with respect to the excitation source and intensity of the electromagnetic field at the hotspot, with the latter playing a determining role. Finite-difference time-domain (FDTD) simulations showed excellent agreement with the experimental findings that an optimal degree of galvanic replacement is critical for maximum SERS enhancement. The rational design and synthesis of the plasmonic nanorattles based on these findings can make these nanostructures highly attractive for SERS-based chemical and biological sensing and bioimaging.

Graphical abstract: Structure-dependent SERS activity of plasmonic nanorattles with built-in electromagnetic hotspots

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Publication details

The article was received on 26 Sep 2017, accepted on 18 Oct 2017 and first published on 20 Oct 2017


Article type: Paper
DOI: 10.1039/C7AN01595J
Citation: Analyst, 2017, Advance Article
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    Structure-dependent SERS activity of plasmonic nanorattles with built-in electromagnetic hotspots

    K. Liu, S. Tadepalli, Z. Wang, Q. Jiang and S. Singamaneni, Analyst, 2017, Advance Article , DOI: 10.1039/C7AN01595J

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