Long-Range Surface Plasmon Resonance Configuration for Enhancing SERS with an Adjustable Refractive Index Sample Buffer to Maintain the Symmetry Condition

doi:10.1021/acsomega.0c03923

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	Long-Range Surface Plasmon Resonance Configuration for Enhancing SERS with an Adjustable Refractive Index Sample Buffer to Maintain the Symmetry Condition
	Y. Liu,H. T. Zhang,Y. J. Geng,S. P. Xu,W. Q. Xu,J. Yu,W. Y. Deng,B. Yu and L. P. Wang
	2020
发表期刊	Acs Omega
ISSN	2470-1343
卷号	5 期号:51 页码:32951-32958
摘要	We propose a method to maintain the symmetry condition of the refractive index with respect to a dielectric buffer layer for a long-range surface plasmon resonance (LRSPR) configuration. The symmetry condition was maintained by changing the concentration of the ethylene glycol aqueous solution (sample buffer layer) to match the refractive index of the MgF2 film. Maintenance of the symmetry condition is necessary for exciting the LRSPR mode and increasing the electric field intensity near the film. We used a four-phase Kretschmann resonance setup composed of a K9 prism, MgF2 film, Ag film, and sample buffer layer. The incident angle-dependent surface-enhanced Raman scattering (SERS) spectra were measured in the evanescent field. At the SPR angle, the SERS signal of the symmetric configuration was 60 times higher than that of the conventional SPR configuration. Moreover, the electric field penetration depth of the symmetric long-range surface plasmon configuration (>1000 nm) was longer than that of their asymmetric counterparts. The enhancement factor of the symmetric configuration was 8.6 x 10(7), which corresponded to the lowest detectable concentration for 4-mercaptopyridine, reaching 1.0 x 10 (-10) M at the resonance angle. Thus, the symmetric LRSPR configuration has great potential for label-free sensing and detection of macromolecules and biomolecules.
DOI	10.1021/acsomega.0c03923
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收录类别	SCI
语种	英语
引用统计
文献类型	期刊论文
条目标识符	http://ir.ciomp.ac.cn/handle/181722/64659
专题	中国科学院长春光学精密机械与物理研究所
推荐引用方式 GB/T 7714	Y. Liu,H. T. Zhang,Y. J. Geng,S. P. Xu,W. Q. Xu,J. Yu,W. Y. Deng,B. Yu and L. P. Wang. Long-Range Surface Plasmon Resonance Configuration for Enhancing SERS with an Adjustable Refractive Index Sample Buffer to Maintain the Symmetry Condition[J]. Acs Omega,2020,5(51):32951-32958.
APA	Y. Liu,H. T. Zhang,Y. J. Geng,S. P. Xu,W. Q. Xu,J. Yu,W. Y. Deng,B. Yu and L. P. Wang.(2020).Long-Range Surface Plasmon Resonance Configuration for Enhancing SERS with an Adjustable Refractive Index Sample Buffer to Maintain the Symmetry Condition.Acs Omega,5(51),32951-32958.
MLA	Y. Liu,H. T. Zhang,Y. J. Geng,S. P. Xu,W. Q. Xu,J. Yu,W. Y. Deng,B. Yu and L. P. Wang."Long-Range Surface Plasmon Resonance Configuration for Enhancing SERS with an Adjustable Refractive Index Sample Buffer to Maintain the Symmetry Condition".Acs Omega 5.51(2020):32951-32958.

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