Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 5, Issue 21, Pages 10643-10649Publisher
AMER CHEMICAL SOC
DOI: 10.1021/am402604h
Keywords
ultrathin silica-coated; Ag@SiO2 NPs; FSP; SERS
Funding
- National Natural Science Foundation of China [20925621, 21236003, 81071994]
- Shanghai Rising-Star Program [13QA1401100]
- Special Projects for Nanotechnology of Shanghai [11 nm0500800, 11 nm0500200]
- Basic Research Program of Shanghai [11JC1403000]
- Special Research Fund for the Docoral Program of Higher Education of China [20110074110010]
- Fundamental Research Funds for the Central Universities
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Silica-coated Ag nanoparticles (Ag@SiO2 NPs) have been successfully prepared by a scalable flame spray pyrolysis (FSP) technique with production rate up to 4 g/h in laboratory-scale. The ultrathin SiO2 shell, with a thickness 1 nm, not only effectively avoids the intersintering of Ag nanoparticles core at the high temperature, but also serves as a protective layer of the SERS-active nanostructure. The silica-coated Ag nanoparticles form agglomerates in the large temperature gradient zone, which with several nanometers gaps from each other but not contact. Such an intriguing feature can result in more Raman hot-spots generated at the gaps among Ag core active sites, which will beneficial for the whole SERS substrate enhancement. The results demonstrate that a maximum enhancement factor can reach similar to 10(5) with a detectable concentration as low as 10(-10) M for rhodamine 6G (R6G) molecules, indicating that the as-obtained unique nanostructure will be a promising candidate for SERS applications.
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