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Proceedings Paper

Tip-enhanced near-field Raman spectroscopy applied to nano-composite materials
Author(s): Yuika Saito; Kazuhiro Yanagi; Norihiko Hayazawa; Hiromichi Kataura; Satoshi Kawata
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Paper Abstract

Vibrational spectroscopy, including Raman spectroscopy can be used for identifying molecular species, which is not possible by a scanning probe microscopy or an electron microscopy. Moreover, vibrational spectra contain structural information, such as intermolecular interactions, molecular orientations, and symmetry distortions of each species. Therefore, Raman spectroscopy is a powerful tool for studying the chemical composition of matter. By employing Tip-enhanced Raman spectroscopy (TERS), we can perform Raman spectroscopy with nano-scale spatial resolution. Our approach relies on the enhanced filed near a laser irradiated metal tip which works as the Raman excitation source. We have investigated nano-composite materials by TERS. Near-field Raman spectra revealed the nano-scale properties of molecules encapsulated in single-wall carbon nanotubes (SWNT). The enhanced field act on encapsulated molecules through the wall of SWNT to extract chemical information inside. &bgr;-carotene which has strong Raman intensities under visible light illuminations is used as an encapsulated molecule. The advantage of Raman spectroscopy is that the information of both SWNT and &bgr;-carotene can be obtained at the same time. So, it is possible to discuss the interaction between SWNT and the encapsulated molecules. Near-field Raman spectra measured at several different positions on SWNT bundle show that &bgr;-carotenes inside the tube are not uniformly distributed. We also find that the filling rates and the peak positions of the radial breathing mode of SWNT are linearly correlated.

Paper Details

Date Published: 28 September 2007
PDF: 8 pages
Proc. SPIE 6642, Plasmonics: Nanoimaging, Nanofabrication, and Their Applications III, 66420E (28 September 2007); doi: 10.1117/12.733706
Show Author Affiliations
Yuika Saito, Osaka Univ. (Japan)
Kazuhiro Yanagi, RIKEN—The Institute of Physical and Chemical Research (Japan)
Norihiko Hayazawa, AIST—National Institute of Advanced Industrial Science and Technology (Japan)
Hiromichi Kataura, RIKEN—The Institute of Physical and Chemical Research (Japan)
Satoshi Kawata, AIST—National Institute of Advanced Industrial Science and Technology (Japan)
Osaka Univ. (Japan)


Published in SPIE Proceedings Vol. 6642:
Plasmonics: Nanoimaging, Nanofabrication, and Their Applications III
Satoshi Kawata; Vladimir M. Shalaev; Din-Ping Tsai, Editor(s)

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