title: One-process fabrication of metal hierarchical nanostructures with rich nanogaps for highly-sensitive surface-enhanced Raman scattering.
abstract: 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.
authors: Laboratory of Nanomaterials and Sensors, College of Physics and Communication Electronics, Jiangxi Normal University & Key Laboratory of Optoelectronic and Telecommunication of Jiangxi Province, Nanchang 330022, People's Republic of China.
authors: Gui-qiang
authors: GQ
authors: Liu
authors: Mei-dong
authors: MD
authors: Yu
authors: Zheng-qi
authors: ZQ
authors: Liu
authors: Xiao-shan
authors: XS
authors: Liu
authors: Shan
authors: S
authors: Huang
authors: Ping-ping
authors: PP
authors: Pan
authors: Yan
authors: Y
authors: Wang
authors: Mu-lin
authors: ML
authors: Liu
authors: Gang
authors: G
authors: Gu