Gap structure effects on surface-enhanced raman scattering intensities for gold gapped rods

Shuzhou Li, María L. Pedano, Shih Hui Chang, Chad A. Mirkin, George C. Schatz

研究成果: Article同行評審

97 引文 斯高帕斯(Scopus)

摘要

Gapped rods provide a unique platform for elucidating structure/function relationships, both for single-molecule electrochemical techniques and for surface-enhanced Raman scattering (SERS). This paper attempts to elucidate the dependence of SERS intensities on gap topography and gap distance for gold gapped rods with segment lengths varying over a wide range (40-2000 nm). Significantly, we have determined that rough gaps lead to a smaller SERS enhancement than smooth gaps for these structures even though the rough gaps have a larger total surface area. Both theory and experiment show periodic variation of SERS intensity with segment length as determined by odd-symmetry plasmon multipoles. Excitation of even-symmetry modes is dipole forbidden (for polarization along the rod axis), but this selection rule can be relaxed by roughness or, for smooth gaps, by near-field coupling between the rod segments.

原文English
頁(從 - 到)1722-1727
頁數6
期刊Nano letters
10
發行號5
DOIs
出版狀態Published - 2010 五月 12

All Science Journal Classification (ASJC) codes

  • 生物工程
  • 化學 (全部)
  • 材料科學(全部)
  • 凝聚態物理學
  • 機械工業

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