Journal
SENSORS
Volume 17, Issue 11, Pages -Publisher
MDPI
DOI: 10.3390/s17112563
Keywords
surface enhanced Raman scattering; surface enhanced resonance Raman scattering; gold nanoparticle; non-spherical nanoparticle; localized surface plasmon
Funding
- National Science Council [100-2113-M-011-002-MY2]
- National Taiwan University of Science and Technology [100B1212]
- National Taiwan University of Science and Technology
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Surface-enhanced resonance Raman scattering (SERRS) of rhodamine 6G was measured on confeito-like Au nanoparticles (CAuNPs). The large CAuNPs (100 nm in diameter) in aqueous dispersion systems showed stronger enhancing effect (analytical enhancement factor: over 10(5)) of SERRS than the small CAuNPs (50 nm in diameter), while the spherical Au nanoparticles (20 nm in diameter) displayed rather weak intensities. Especially, minor bands in 1400-1600 cm(-1) were uniquely enhanced by the resonance effect of CAuNPs. The enhancement factors revealed a concentration dependence of the enhancing effect at low concentration of rhodamine 6G. This dependency was due to a large capacity of hot-spots on CAuNPs, which were formed without agglomeration. The surface-enhancing behaviour in the film systems was similar to that in the dispersions, although the large CAuNPs had lower enhancing effect in the films, and the small CAuNPs and the spherical Au nanoparticles were more effective in their films. These results suggest that the CAuNPs have an advantage in ultrasensitive devices both in dispersions and films, compared to the agglomerate of spherical Au nanoparticles.
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