Bulletin of the Korean Chemical Society

Korean Chemical Society (대한화학회)
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Effect of Foreign Molecules on the SERS of Probe Molecules Trapped in Gaps between Planar Ag and Nano-sized Ag Particles

  • Kim, Kwan (Department of Chemistry, Seoul National University) ;
  • Choi, Jeong-Yong (Department of Chemistry, Seoul National University) ;
  • Shin, Kuan Soo (Department of Chemistry, Soongsil University)
  • Received : 2012.10.29
  • Accepted : 2012.12.11
  • Published : 2013.03.20
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Abstract

A few years ago, the plasmon-induced electronic coupling (PIEC) model was proposed in the literature to explain small changes in the surface-enhanced Raman scattering (SERS) in nanogap systems. If this model is correct, it will be very helpful in both basic and application fields. In light of this, we carefully reexamined its appropriateness. Poly(4-vinylpyridine) (P4VP) used in the earlier work was, however, never a proper layer, since most adsorbates not only adsorbed onto Ag nanoparticles sitting on P4VP but also penetrated into the P4VP layer deposited initially onto a flat Ag substrate, ultimately ending up in the SERS hot sites. Using 1,4-phenylenediisocyanide and 4-nitrophenol as the affixing layer and the foreign adsorbate, respectively, we could clearly reveal that the PIEC model is not suited for explaining the Raman signal in a nanogap system. Most of the Raman signal must have arisen from molecules situated at the gap center.

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References

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