期刊
NANOSCALE
卷 9, 期 17, 页码 5725-5736出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/c7nr00969k
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资金
- Conseil Regional d'Aquitaine
- European FP7 project MetaChem [228762]
- ANR Project UNIT3D [ANR-BLAN-SIMI10-LS-100617-15-01]
- LABEX one [ANR-10-LABX-42, ANR-10-IDEX-03-02]
- European Research Council [PrioSERS FP7/2014 623527]
- Ministerio de Economia y Competitividad [CTQ2014-59808-R]
- Generalitat de Catalunya [2014SGR480, AGAUR-2014-052]
- ICREA Funding Source: Custom
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.
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