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

Research output: Contribution to journalArticle

90 Citations (Scopus)

Abstract

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.

Original languageEnglish
Pages (from-to)1722-1727
Number of pages6
JournalNano Letters
Volume10
Issue number5
DOIs
Publication statusPublished - May 12 2010

Fingerprint

Gold
Raman scattering
rods
Raman spectra
gold
Topography
symmetry
multipoles
Surface roughness
periodic variations
Polarization
near fields
topography
roughness
platforms
Molecules
dipoles
augmentation
polarization
Experiments

Keywords

  • Nanogap
  • Roughness
  • SERS

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Bioengineering
  • Chemistry(all)
  • Materials Science(all)
  • Mechanical Engineering

Cite this

Gap structure effects on surface-enhanced raman scattering intensities for gold gapped rods. / Li, Shuzhou; Pedano, María L.; Chang, Shih Hui; Mirkin, Chad A.; Schatz, George C.

In: Nano Letters, Vol. 10, No. 5, 12.05.2010, p. 1722-1727.

Research output: Contribution to journalArticle

Li, Shuzhou ; Pedano, María L. ; Chang, Shih Hui ; Mirkin, Chad A. ; Schatz, George C. / Gap structure effects on surface-enhanced raman scattering intensities for gold gapped rods. In: Nano Letters. 2010 ; Vol. 10, No. 5. pp. 1722-1727.
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