Surface-enhanced Raman nanodomes

Charles J. Choi, Zhida Xu, Hsin Yu Wu, Gang Logan Liu, Brian T. Cunningham

研究成果: 雜誌貢獻文章同行評審

100 引文 斯高帕斯(Scopus)

摘要

We demonstrate a surface-enhanced Raman scattering (SERS) substrate consisting of a closely spaced metal nanodome array fabricated on flexible plastic film. We used a low-cost, large-area replica molding process to produce a two-dimensional periodic array of cylinders that is subsequently overcoated with SiO2 and silver thin films to form dome-shaped structures. Finite element modeling was used to investigate the electromagnetic field distribution of the nanodome array structure and the effect of the nanodome separation distance on the electromagnetic field enhancement. The SERS enhancement from the nanodome array substrates was experimentally verified using rhodamine 6G as the analyte. With a separation distance of 17 nm achieved between adjacent domes using a process that is precisely controlled during thin film deposition, a reproducible SERS enhancement factor of 1.37 × 10 8 was demonstrated. The nanoreplica molding process presented in this work allows for simple, low-cost, high-throughput fabrication of uniform nanoscale SERS substrates over large surface areas without the requirement for high resolution lithography or defect-free deposition of spherical microparticle monolayer templates.

原文英語
文章編號415301
期刊Nanotechnology
21
發行號41
DOIs
出版狀態已發佈 - 10月 15 2010
對外發佈

ASJC Scopus subject areas

  • 生物工程
  • 化學 (全部)
  • 電氣與電子工程
  • 機械工業
  • 材料力學
  • 材料科學(全部)

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