Journal
CANADIAN JOURNAL OF CHEMISTRY
Volume 93, Issue 1, Pages 51-59Publisher
CANADIAN SCIENCE PUBLISHING, NRC RESEARCH PRESS
DOI: 10.1139/cjc-2014-0247
Keywords
tip-enhanced Raman spectroscopy; localized surface plasmon resonance; near-field spectroscopy; radial polarization; atomic force microscopy; spatial resolution; enhancement factor; single-walled carbon nanotubes
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Funding
- Natural Sciences and Engineering Research Council of Canada
- Ontario Graduate Scholarship
- Vanier CGS scholarship
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Bundles of single-walled carbon nanotubes (SWCNTs) prepared by plasma torch method and further purified, are deposited over a glass coverslip to estimate the spatial resolution of tip-enhanced Raman spectroscopy measurements. For this purpose, near-field Raman maps and spectra of isolated bundles of carbon nanotubes are collected using optimized experimental conditions such as a tightly focused beam using a 1.4 numerical aperture oil immersion microscope objective and a gold coated atomic force microscope probe illuminated by a radially polarized 632.8 nm wavelength to selectively excite the localized surface plasmon confined at the extremity of the tip. The near-field nature of the collected Raman signals is evaluated through measuring the decay of the Raman signal with respect to the tip-sample separation.
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