skip to main content
OSTI.GOV title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: Selective probe of the morphology and local vibrations at carbon nanoasperities

Abstract

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{sup -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.

Authors:
; ;  [1]; ;  [2];  [3];  [4]
  1. Research Center for Exotic Nanocarbons (JST), Shinshu University, 4-17-1, Wakasato, Nagano-city 380-8553 (Japan)
  2. Department of Applied Chemistry, Faculty of Engineering, Nagasaki University, 1-14 Bunkyo-machi, Nagasaki-shi, Nagasaki 852-8521 (Japan)
  3. Physics and Astronomy Department, Michigan State University, East Lansing, Michigan 48824 (United States)
  4. Department of Chemistry, Chiba University, 1-33 Yayoi-cho, Inage-ku, Chiba 263-8522 (Japan)
Publication Date:
OSTI Identifier:
22047170
Resource Type:
Journal Article
Journal Name:
Journal of Chemical Physics
Additional Journal Information:
Journal Volume: 136; Journal Issue: 6; Other Information: (c) 2012 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 0021-9606
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; 37 INORGANIC, ORGANIC, PHYSICAL AND ANALYTICAL CHEMISTRY; CRYSTALS; DENSITY FUNCTIONAL METHOD; FREQUENCY RANGE; FULLERENES; LASER RADIATION; LASERS; MATERIALS; MORPHOLOGY; NANOSTRUCTURES; OSCILLATION MODES; PEAKS; PROBES; RAMAN EFFECT; RAMAN SPECTRA; SURFACES

Citation Formats

Fujimori, Toshihiko, Endo, Morinobu, Kaneko, Katsumi, Urita, Koki, Moriguchi, Isamu, Tomanek, David, and Ohba, Tomonori. Selective probe of the morphology and local vibrations at carbon nanoasperities. United States: N. p., 2012. Web. doi:10.1063/1.3682771.
Fujimori, Toshihiko, Endo, Morinobu, Kaneko, Katsumi, Urita, Koki, Moriguchi, Isamu, Tomanek, David, & Ohba, Tomonori. Selective probe of the morphology and local vibrations at carbon nanoasperities. United States. https://doi.org/10.1063/1.3682771
Fujimori, Toshihiko, Endo, Morinobu, Kaneko, Katsumi, Urita, Koki, Moriguchi, Isamu, Tomanek, David, and Ohba, Tomonori. 2012. "Selective probe of the morphology and local vibrations at carbon nanoasperities". United States. https://doi.org/10.1063/1.3682771.
@article{osti_22047170,
title = {Selective probe of the morphology and local vibrations at carbon nanoasperities},
author = {Fujimori, Toshihiko and Endo, Morinobu and Kaneko, Katsumi and Urita, Koki and Moriguchi, Isamu and Tomanek, David and Ohba, Tomonori},
abstractNote = {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{sup -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.},
doi = {10.1063/1.3682771},
url = {https://www.osti.gov/biblio/22047170}, journal = {Journal of Chemical Physics},
issn = {0021-9606},
number = 6,
volume = 136,
place = {United States},
year = {Tue Feb 14 00:00:00 EST 2012},
month = {Tue Feb 14 00:00:00 EST 2012}
}