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Apertureless near-field Raman spectroscopy.

J J Wang1, D A Smith, D N Batchelder

  • 1Department of Physics and Astronomy, University of Leeds, Leeds LS2 9JT, UK. phyjjw@phynov.leeds.ac.uk

Journal of Microscopy
|June 6, 2003
PubMed
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We demonstrate tip-enhanced Raman spectroscopy using a gold-coated atomic force microscope tip. This method allows simultaneous topographic and spectral analysis of C60 molecules, showcasing the tip enhancement effect.

Area of Science:

  • Nanotechnology
  • Spectroscopy
  • Materials Science

Background:

  • Raman spectroscopy provides valuable molecular information but often suffers from weak signals.
  • Scanning probe microscopy offers high-resolution surface imaging and manipulation capabilities.

Purpose of the Study:

  • To investigate the application of tip-enhanced Raman spectroscopy (TERS) for analyzing C60 molecules.
  • To demonstrate the capability of a custom-built apertureless scanning near-field optical microscope (SNOM) for simultaneous topographic and spectral measurements.

Main Methods:

  • Utilized a custom-built apertureless SNOM system.
  • Employed a commercial atomic force microscope (AFM) tip coated with 100 nm of gold.
  • Acquired tip-enhanced Raman spectra of C60 samples.

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Main Results:

  • Successfully obtained tip-enhanced Raman spectra of C60.
  • Demonstrated the localized enhancement of the Raman signal by the gold-coated AFM tip.
  • Achieved simultaneous acquisition of topographic and spectral data.

Conclusions:

  • The developed TERS system effectively enhances Raman signals for molecular analysis.
  • The gold-coated AFM tip plays a crucial role in the signal enhancement.
  • This technique shows promise for high-resolution chemical imaging of materials like C60.