Journal
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
Volume 11, Issue 28, Pages 5903-5908Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/b903533h
Keywords
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Funding
- NSF through a research grant from DMR [0804088]
- NIH [5DP1OD000798-04]
- OFFICE OF THE DIRECTOR, NATIONAL INSTITUTES OF HEALTH [DP1OD000798] Funding Source: NIH RePORTER
- Division Of Materials Research [0804088] Funding Source: National Science Foundation
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The surface-enhanced Raman scattering (SERS) properties of bimetallic Au-Ag nanocages has been thoroughly investigated by changing the nanocage composition, localized surface plasmon resonance (LSPR) peak position and excitation wavelength. We found a significant dependency on excitation wavelength for the Au-Ag nanocages, independent of the underlying LSPR, which can be extended to other bimetallic SERS substrates. While it is well-understood that plasmon damping can occur for Au nanoparticles when their LSPR peaks are close to interband transition frequencies and thereby attenuate SERS intensities, this study probes an additional aspect and shows that SERS intensities are reduced when the excitation light source is near interband transition frequencies regardless of the LSPR location.
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