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Journal of Chemical Physics / Volume 136 / Issue 6 / ARTICLES / Condensed Phase Dynamics, Structure, and Thermodynamics: Spectroscopy, Reactions, and Relaxation

J. Chem. Phys. 136, 064505 (2012); http://dx.doi.org/10.1063/1.3682771 (5 pages)

Selective probe of the morphology and local vibrations at carbon nanoasperities

Toshihiko Fujimori (藤森 利彦)1, Koki Urita (瓜田 幸幾)2, David Tománek3, Tomonori Ohba (大場 友則)4, Isamu Moriguchi (森口 勇)2, Morinobu Endo (遠藤 守信)1, and Katsumi Kaneko (金子 克美)1

1Research Center for Exotic Nanocarbons (JST), Shinshu University, 4-17-1, Wakasato, Nagano-city 380-8553, Japan
2Department of Applied Chemistry, Faculty of Engineering, Nagasaki University, 1-14 Bunkyo-machi, Nagasaki-shi, Nagasaki 852-8521, Japan
3Physics and Astronomy Department, Michigan State University, East Lansing, Michigan 48824, USA
4Department of Chemistry, Chiba University, 1-33 Yayoi-cho, Inage-ku, Chiba 263-8522, Japan

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(Received 22 December 2011; accepted 17 January 2012; published online 8 February 2012)

We introduce a way to selectively probe local vibration modes at nanostructured asperities such as tips of carbon nanohorns. Our observations benefit from signal amplification in surface-enhanced Raman scattering (SERS) at sites near a silver surface. We observe nanohorn tip vibration modes in the range 200–500 cm−1, which are obscured in regular Raman spectra. Ab initio density functional calculations assign modes in this frequency range to local vibrations at the nanohorn cap resembling the radial breathing mode of fullerenes. Careful interpretation of our SERS spectra indicates presence of caps with 5 or 6 pentagons, which are chemically the most active sites. Changes in the peak intensities and frequencies with time indicate that exposure to laser irradiation may cause structural rearrangements at the cap.

© 2012 American Institute of Physics

Article Outline

  1. INTRODUCTION
  2. EXPERIMENTAL
  3. RESULTS AND DISCUSSION
  4. CONCLUDING REMARKS

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KEYWORDS, PACS, and IPC

Keywords

ab initio calculations, carbon, crystal morphology, density functional theory, laser beam effects, nanostructured materials, surface enhanced Raman scattering, vibrational modes

PACS

  • 63.22.Kn

    Clusters and nanocrystals

  • 68.55.J-

    Morphology of films

  • 61.46.Hk

    Nanocrystals

  • 61.80.Ba

    Ultraviolet, visible, and infrared radiation effects (including laser radiation)

  • 61.82.Rx

    Nanocrystalline materials

  • 78.30.Hv

    Other nonmetallic inorganics

International Patent Classification (IPC)

ARTICLE DATA

Digital Object Identifier
http://dx.doi.org/10.1063/1.3682771

PUBLICATION DATA

ISSN

0021-9606 (print)  
1089-7690 (online)

Publisher

$abstract.society.value is a Member of CrossRef American Institute of Physics

For access to fully linked references, you need to log in.
    L. Vitali, M. Burghard, M. A. Schneider, L. Liu, S. Y. Wu, C. S. Jayanthi, and K. Kern, Phys. Rev. Lett. 93, 136103 (2004).

    S. Berber, Y.-K. Kwon, and D. Tománek, Phys. Rev. B 62, R2291 (2000).

    S. Han, M. Yoon, S. Berber, N. Park, E. Osawa, J. Ihm, and D. Tománek, Phys. Rev. B 70, 113402 (2004).

    Y. Miyamoto, A. Rubio, and D. Tománek, Phys. Rev. Lett. 97, 126104 (2006).


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