Robust raspberry-like metallo-dielectric nanoclusters of critical sizes as SERS substrates. - Archive ouverte HAL Access content directly
Journal Articles Nanoscale Year : 2017

Robust raspberry-like metallo-dielectric nanoclusters of critical sizes as SERS substrates.

Etienne Pertreux
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Aurelien Crut
Paolo Maioli
Fabrice Vallée
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Abstract

Raspberry-like nano-objects made of large plasmonic satellites (>10 nm) covering a central dielectric particle have many potential applications as photonic materials, superlenses and (bio-) sensors, but their synthesis remains challenging. Herein, we show how to build stable and robust raspberry-like nano-systems with close-packed satellites, by combining monodisperse silica particles (80 or 100 nm diameter) and oppositely charged noble metal nanoparticles (Au or Ag) with well-defined sizes (10-50 nm). The spectral characteristics of their associated plasmonic resonances (wavelength, linewidth, extinction cross-section) and the electromagnetic coupling between satellites were observed using the spatial modulation spectroscopy technique and interpreted through a numerical model. The composite nano-objects exhibit numerous hot spots at satellite junctions, resulting in excellent surface-enhanced Raman scattering (SERS) performance. The SERS efficiency of the raspberry-like clusters is highly dependent on their structure.
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Dates and versions

hal-01520572 , version 1 (10-05-2017)

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Aurélie Le Beulze, Sergio Gomez-Graña, Hélène Gehan, Stéphane Mornet, Serge Ravaine, et al.. Robust raspberry-like metallo-dielectric nanoclusters of critical sizes as SERS substrates.. Nanoscale, 2017, 9 (17), pp.5725-5736. ⟨10.1039/C7NR00969K⟩. ⟨hal-01520572⟩
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