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

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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.

Graphical abstract: Robust raspberry-like metallo-dielectric nanoclusters of critical sizes as SERS substrates

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Publication details

The article was received on 09 Feb 2017, accepted on 08 Apr 2017 and first published on 11 Apr 2017


Article type: Paper
DOI: 10.1039/C7NR00969K
Citation: Nanoscale, 2017, Advance Article
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    Robust raspberry-like metallo-dielectric nanoclusters of critical sizes as SERS substrates

    A. Le Beulze, S. Gomez-Graña, H. Gehan, S. Mornet, S. Ravaine, M. Correa-Duarte, L. Guerrini, R. A. Alvarez-Puebla, E. Duguet, E. Pertreux, A. Crut, P. Maioli, F. Vallée, N. Del Fatti, O. Ersen and M. Treguer-Delapierre, Nanoscale, 2017, Advance Article , DOI: 10.1039/C7NR00969K

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