期刊
CHEMPHYSCHEM
卷 18, 期 21, 页码 3066-3075出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/cphc.201700601
关键词
nanoparticles; optical properties; Raman spectroscopy; self-assembly; superlattices
资金
- Labex MiChem [ANR-11-IDEX-0004-02]
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 (5-12nm 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.
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