4.6 Article

One-process fabrication of metal hierarchical nanostructures with rich nanogaps for highly-sensitive surface-enhanced Raman scattering

期刊

NANOTECHNOLOGY
卷 26, 期 18, 页码 -

出版社

IOP PUBLISHING LTD
DOI: 10.1088/0957-4484/26/18/185702

关键词

surface-enhanced Raman scattering; hierarchical nanostructures; localized surface plasmon resonances; surface plasmon polaritons

资金

  1. National Natural Science Foundation of China [11264017, 11464019, 11004088]
  2. Natural Science Foundation [2014BAB212001, 20122BAB202006]
  3. Young Scientist development program of Jiangxi Province [20142BCB23008]

向作者/读者索取更多资源

One-process fabrication of highly active and reproducible surface-enhanced Raman scattering (SERS) substrates via ion beam deposition is reported. The fabricated metal-dielectric-metal (MDM) hierarchical nanostructure possesses rich nanogaps and a tunable resonant cavity. Raman scattering signals of analytes are dramatically strengthened due to the strong near-field coupling of localized surface plasmon resonances (LSPRs) and the strong interaction of LSPRs of metal NPs with surface plasmon polaritons (SPPs) on the underlying metal film by crossing over the dielectric spacer. The maximum Raman enhancement for the highest Raman peak at 1650 cm(-1) is 13.5 times greater than that of a single metal nanoparticle (NP) array. Moreover, the SERS activity can be efficiently tailored by varying the size and number of voids between adjacent metal NPs and the thickness of the dielectric spacer. These findings may broaden the scope of SERS applications of MDM hierarchical nanostructures in biomedical and analytical chemistry.

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