Bulletin of the Korean Chemical Society

Korean Chemical Society (대한화학회)
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Tip-Enhanced Raman Scattering with a Nanoparticle-Functionalized Probe

  • Received : 2012.01.20
  • Accepted : 2012.02.27
  • Published : 2012.05.20
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Abstract

We carried out the tip-enhanced Raman scattering (TERS) with a tip that is functionalized with a Aunanoparticle (AuNP, with a diameter of 250 nm). The AuNP tip is fabricated by a direct mechanical pickup of a AuNP from a flat substrate, and the TERS signal from the AuNP tip - organic monolayer - Au thin film (thickness of 10 nm) is recorded. We find that such a AuNP-tip interacting with a thin film routinely yields signal enhancement larger than ${\sim}10^4$, which is sufficient not only for local (with detection area of ~200 $nm^2$) Raman spectroscopy, but also the nanometric imaging of organic monolayers within a reasonable acquisition time (~20 minutes/image).

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