期刊
JOURNAL OF PHYSICAL CHEMISTRY C
卷 114, 期 47, 页码 19913-19919出版社
AMER CHEMICAL SOC
DOI: 10.1021/jp107063x
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资金
- EPSRC
- Department for Education
- QUB
- Engineering and Physical Sciences Research Council [EP/G010374/1, EP/H000917/1, EP/H000917/2] Funding Source: researchfish
- EPSRC [EP/G010374/1, EP/H000917/2, EP/H000917/1] Funding Source: UKRI
Surface-enhanced Raman scattering (SERS) spectra from molecules adsorbed on the surface of vertically aligned gold nanorod arrays exhibit a variation in enhancement factor (EF) as a function of excitation wavelength that displays little correlation with the elastic optical properties of the surface. The key to understanding this lack of correlation and to obtaining agreement between experimental and calculated EF spectra lies with consideration of randomly distributed, sub-10 nm gaps between nanorods forming the substrate. Intense fields in these enhancement hot spots make a dominant contribution to the Raman scattering and have a very different spectral profile to that of the elastic optical response. Detailed modeling of the electric field enhancement at both excitation and scattering wavelengths was used to quantitatively predict both the spectral profile and the magnitude of the observed EF.
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