Tunable SERS Platforms from Small Nanoparticle 3D Superlattices: A Comparison between Gold, Silver, and Copper

Herein we present new substrates for surface‐enhanced Raman spectroscopy (SERS). The synthesis of colloidal nanoparticles through an organometallic route allowed us to obtain gold, silver, or copper nanoparticles with well‐controlled shapes and sizes (5–12 nm in diameter). The organization of these...

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Bibliographic Details
Published in:Chemphyschem 2017-11, Vol.18 (21), p.3066-3075
Main Authors: Chapus, Lionel, Aubertin, Pierre, Joiret, Suzanne, Lucas, Ivan T., Maisonhaute, Emmanuel, Courty, Alexa
Format: Article
Language:English
Subjects:
Chemical Physics
Copper
Correlation analysis
Gold
Nanoparticles
Optical properties
Physics
Raman spectroscopy
self-assembly
Silver
Substrates
Superlattices
Thickness
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Summary:Herein we present new substrates for surface‐enhanced Raman spectroscopy (SERS). The synthesis of colloidal nanoparticles through an organometallic route allowed us to obtain gold, silver, or copper nanoparticles with well‐controlled shapes and sizes (5–12 nm in diameter). The organization of these nanoparticles into large‐scale 3D superlattices produces a very large number of “hot spots” at the origin of the signal enhancement. Each superlattice was studied individually to correlate its optical and SERS properties to the thickness, the nanoparticle sizes, and the interparticle distance. This experimental and theoretical study provides insights for the optimization and tuning of the SERS activity. Indeed, significant SERS amplification could be observed regardless of the nature of the metal. In addition, the SERS signal was homogeneous at the surface of the superlattices, which opens the route for a new approach in analytical SERS detection. Lattices for enhancement: Self‐organized small metallic nanoparticles present exceptional optical and surface‐enhanced Raman spectroscopy (SERS) responses that depend on the superlattice thickness.
ISSN:1439-4235
1439-7641
DOI:10.1002/cphc.201700601