AI Article Synopsis
- The study investigated how gold (Au) cores within silver (Ag) shells can improve surface-enhanced Raman scattering (SERS) by examining different Au/Ag ratios in dendritic nanoforests on silicon substrates.
- Using a fluoride-assisted Galvanic replacement reaction method, high-density Au@Ag-DNFs/Si were synthesized and characterized through various techniques, including electron microscopy and Raman spectroscopy.
- The results showed that while pure Ag dendritic nanoforests had strong light absorption, they produced lower SERS responses compared to Au@Ag structures, which benefited from the Au's optical properties that enhanced light focus and SERS effectiveness.
Article Abstract
The effects of Au cores in Ag shells in enhancing surface-enhanced Raman scattering (SERS) were evaluated with samples of various Au/Ag ratios. High-density Ag shell/Au core dendritic nanoforests (Au@Ag-DNFs) on silicon (Au@Ag-DNFs/Si) were synthesized using the fluoride-assisted Galvanic replacement reaction method. The synthesized Au@Ag-DNFs/Si samples were characterized using scanning electron microscopy, energy-dispersive X-ray spectroscopy, reflection spectroscopy, X-ray diffraction, and Raman spectroscopy. The ultraviolet-visible extinction spectrum exhibited increased extinction induced by the addition of Ag when creating the metal DNFs layer. The pure Ag DNFs exhibited high optical extinction of visible light, but low SERS response compared with Au@Ag DNFs. The Au core (with high refractive index real part) in Au@Ag DNFs maintained a long-leaf structure that focused the illumination light, resulting in the apparent SERS enhancement of the Ag coverage.
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| http://www.ncbi.nlm.nih.gov/pmc/articles/PMC8307875 | PMC |
| http://dx.doi.org/10.3390/nano11071736 | DOI Listing |
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Article Synopsis
- The study investigated how gold (Au) cores within silver (Ag) shells can improve surface-enhanced Raman scattering (SERS) by examining different Au/Ag ratios in dendritic nanoforests on silicon substrates.
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