LE BEULZE, Aurélie; GOMEZ-GRAÑA, Sergio; GEHAN, Hélène; MORNET, Stéphane; RAVAINE, Serge; CORREA-DUARTE, Miguel A.; GUERRINI, Luca; ALVAREZ-PUEBLA, Ramon A.; DUGUET, Etienne; PERTREUX, Etienne; CRUT, Aurelien; MAIOLI, Paolo; VALLÉE, Fabrice; DEL FATTI, Natalia; ERSEN, Ovidiu; TRÉGUER-DELAPIERRE, Mona

doi:10.1039/C7NR00969K

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LE BEULZE, Aurélie
Institut de Chimie de la Matière Condensée de Bordeaux [ICMCB]

GOMEZ-GRAÑA, Sergio
Institut de Chimie de la Matière Condensée de Bordeaux [ICMCB]

GEHAN, Hélène
Institut de Chimie de la Matière Condensée de Bordeaux [ICMCB]
Institut Lumière Matière [Villeurbanne] [ILM]

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Nanoscale. 2017, vol. 9, n° 17, p. 5725-5736

Royal Society of Chemistry

Resumen en inglés

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.< Leer menos

DOI

http://dx.doi.org/10.1039/C7NR00969K

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Initiative d'excellence de l'Université de Bordeaux

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Institut de Chimie de la Matière Condensée de Bordeaux (ICMCB) - UMR 5026