Localized surface plasmon resonance spectroscopy of single silver triangular nanoprisms

Leif J. Sherry, Rongchao Jin, Chad A. Mirkin, George C Schatz, Richard P. Van Duyne

Research output: Contribution to journalArticle

699 Citations (Scopus)

Abstract

The plasmonic properties of single silver triangular nanoprisms are investigated using dark-field optical microscopy and spectroscopy. Two distinct localized surface plasmon resonances (LSPR) are observed. These are assigned as in-plane dipolar and quadrupolar plasmon excitations using electrodynamic modeling based on the discrete dipole approximation (DOA). The dipole resonance is found to be very intense, and its peak wavelength is extremely sensitive to the height, edge length, and tip sharpness of the triangular nanoprism. In contrast, the intensity of the quadrupole resonance is much weaker relative to the dipole resonance in the single particle spectra than in the ensemble averaged spectrum. Several parameters relevant to the chemical sensing properties of these nanoprisms have been measured. The dependence of the dipole plasmon resonance on the refractive index of the external medium is found to be as high as 205 nm RIU -1 and the plasmon line width as narrow as ∼0.17 eV. These data lead to a sensing figure of merit (FOM), the slope of refractive index sensitivity in eV RIU -1/line width (eV), as high as 3.3. In addition, the LSPR shift response to alkanethiol chain length was found to be linear with a slope of 4.4 nm per CH 2 unit. This Is the highest short-range refractive index sensitivity yet measured for a nanoparticle.

Original languageEnglish
Pages (from-to)2060-2065
Number of pages6
JournalNano Letters
Volume6
Issue number9
DOIs
Publication statusPublished - Sep 2006

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Surface plasmon resonance
Silver
surface plasmon resonance
silver
Spectroscopy
dipoles
Refractive index
refractivity
Linewidth
spectroscopy
slopes
sensitivity
Electrodynamics
sharpness
Chain length
figure of merit
electrodynamics
Optical microscopy
quadrupoles
methylidyne

ASJC Scopus subject areas

  • Materials Science(all)
  • Electronic, Optical and Magnetic Materials
  • Chemistry (miscellaneous)

Cite this

Localized surface plasmon resonance spectroscopy of single silver triangular nanoprisms. / Sherry, Leif J.; Jin, Rongchao; Mirkin, Chad A.; Schatz, George C; Van Duyne, Richard P.

In: Nano Letters, Vol. 6, No. 9, 09.2006, p. 2060-2065.

Research output: Contribution to journalArticle

Sherry, Leif J. ; Jin, Rongchao ; Mirkin, Chad A. ; Schatz, George C ; Van Duyne, Richard P. / Localized surface plasmon resonance spectroscopy of single silver triangular nanoprisms. In: Nano Letters. 2006 ; Vol. 6, No. 9. pp. 2060-2065.
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