Robust raspberry-like metallo-dielectric nanoclusters of critical sizes as SERS substrates.
GEHAN, Hélène
Institut de Chimie de la Matière Condensée de Bordeaux [ICMCB]
Institut Lumière Matière [Villeurbanne] [ILM]
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Institut de Chimie de la Matière Condensée de Bordeaux [ICMCB]
Institut Lumière Matière [Villeurbanne] [ILM]
GEHAN, Hélène
Institut de Chimie de la Matière Condensée de Bordeaux [ICMCB]
Institut Lumière Matière [Villeurbanne] [ILM]
Institut de Chimie de la Matière Condensée de Bordeaux [ICMCB]
Institut Lumière Matière [Villeurbanne] [ILM]
ALVAREZ-PUEBLA, Ramon A.
Institució Catalana de Recerca i Estudis Avançats = Catalan Institution for Research and Advanced Studies [ICREA]
Universitat Rovira i Virgili
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Institució Catalana de Recerca i Estudis Avançats = Catalan Institution for Research and Advanced Studies [ICREA]
Universitat Rovira i Virgili
Langue
en
Article de revue
Ce document a été publié dans
Nanoscale. 2017, vol. 9, n° 17, p. 5725-5736
Royal Society of Chemistry
Résumé en anglais
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 ...Lire la suite >
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.< Réduire
Project ANR
Initiative d'excellence de l'Université de Bordeaux - ANR-10-IDEX-0003
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