Computational study of the surface-enhanced raman scattering from silica-coated silver nanowires

Research output: Contribution to journalArticle

Abstract

Surface-enhanced Raman scattering (SERS) is a popular vibrational spectroscopic technique that can have several applications in chemical and biological sensing. Within the last decade or so, our ability to chemically synthesize nanostructures has improved to the point that the rational design of a variety of SERS substrates is now viable. In this report, we describe a computational study using the finite element method (FEM) to investigate the effects of patchy silica coatings on silver nanowires. We found that varying the degree of silica coating on silver nanowires impacts the enhancement and may be explained through two processes. The first process is a consequence of changes in the dielectric environment surrounding the nanowire due to the silica. As additional layers of silica coat the nanowire, the localized surface plasmon resonance of the nanowire redshifts. The second process is a result of silica distorting the local electric field around the nanowire surface. Anisotropic silica coating can influence anticipated enhancement depending on its spatial localization with respect to excited plasmon modes in the nanowire. We propose that the design of nanostructures with patchy silica coatings can be a viable tool for increasing surface enhancement. The surface-enhanced Raman scattering (SERS) characteristics of patchy silica-coated silver nanowires were investigated using the finite element method. Two processes govern the predicted electromagnetic enhancement. The first process is related to changes in the dielectric environment surrounding the nanowire due to the patchy silica coating. Silica layers cause the localized surface plasmon resonance of the nanowire to redshift, subsequently altering its optical properties. The second process is related to the distortion of the plasmonic fields caused by the silica. We propose that control over the placement and structure of patchy silica can be used to rationally design nanowire-based sensors.

Original languageEnglish (US)
Pages (from-to)415-418
Number of pages4
JournalPhotochemistry and Photobiology
Volume90
Issue number2
DOIs
StatePublished - Jan 1 2014

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Nanowires
Raman Spectrum Analysis
Silver
Silicon Dioxide
Raman scattering
nanowires
silver
Raman spectra
silicon dioxide
coatings
Coatings
Surface Plasmon Resonance
Nanostructures
augmentation
Surface plasmon resonance
surface plasmon resonance
finite element method
Finite element method
Electromagnetic Phenomena

ASJC Scopus subject areas

  • Biochemistry
  • Physical and Theoretical Chemistry

Cite this

Computational study of the surface-enhanced raman scattering from silica-coated silver nanowires. / Devetter, Brent M.; Bhargava, Rohit; Murphy, Catherine J.

In: Photochemistry and Photobiology, Vol. 90, No. 2, 01.01.2014, p. 415-418.

Research output: Contribution to journalArticle

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