Plasmon-sampled surface-enhanced raman excitation spectroscopy on silver immobilized nanorod assemblies and optimization for near infrared (λex = 1064 nm) studies

Nathan G. Greeneltch, Martin G. Blaber, George C. Schatz, Richard P. Van Duyne

Research output: Contribution to journalArticle

56 Citations (Scopus)

Abstract

For many Surface-Enhanced Raman Spectroscopy (SERS) applications, the enhancing substrate must exhibit a number of critical properties that include low cost, robustness, and reproducibly high enhancement over large areas of the substrate. In this study we investigate the SERS fundamental enhancement factor of silver Immobilized Nanorod Assembly (AgINRA) substrates as a function of both the dielectric sphere diameter (310-780 nm) and the input laser wavelength (633-1064 nm) with a technique called plasmon-sampled surface-enhanced Raman excitation spectroscopy (PS-SERES). The nonresonant molecule benzenethiol was chosen as the probe molecule. Higher enhancement factors (EFs) were measured as the plasmon resonance and excitation wavelength's relative separation were optimized and both moved toward the infrared region, ultimately eclipsing the 108 mark. This is the highest EF to date measured on this type of large-area substrate. The enhancement factors reported here are the result of efficient coupling between free space photons and the surface plasmon states in the metal INRA substrate. Coupled with their robustness and ease of fabrication, these results further underscore the value and versatility of metal INRA substrates in the field of surface-enhanced Raman spectroscopy.

Original languageEnglish
Pages (from-to)2554-2558
Number of pages5
JournalJournal of Physical Chemistry C
Volume117
Issue number6
DOIs
Publication statusPublished - Feb 14 2013

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ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Energy(all)
  • Physical and Theoretical Chemistry
  • Surfaces, Coatings and Films

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