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J. Chem. Phys. 127, 154713 (2007); http://dx.doi.org/10.1063/1.2796153 (7 pages)

Influence of impurities on the x-ray photoelectron spectroscopy and Raman spectra of single-wall carbon nanotubes

Zhongrui Li1, Alexandru S. Biris1, Enkeleda Dervishi1, Viney Saini1, Yang Xu1, Alexandru R. Biris2, and Dan Lupu2

1Nanotechnology Center and Applied Science, University of Arkansas at Little Rock, Arkansas 72204, USA
2National Institute for Research and Development of Isotopic and Molecular Technologies, P.O. Box 700, R-400293 Cluj-Napoca, Romania

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(Received 23 May 2007; accepted 13 September 2007; published online 18 October 2007)

The effect of impurities on the properties of single-wall carbon nanotubes (SWNTs) was investigated with multiple analytical techniques. Charge transfer is believed to occur between the impurities and the SWNTs as observed by combining the Raman scattering and x-ray photoelectron measurements. The impurity condition (type and level) was found to strongly affect the electronic and vibrational properties of the SWNT. The metal catalysts in the impurity usually behave as electron donors, which can downshift the graphitic (G) band as well as the radial breathing mode frequencies. The low temperature air oxidation of as-prepared SWNT material usually upshifts the radial breathing mode Raman peaks to higher frequencies.

© 2007 American Institute of Physics

Article Outline

  1. INTRODUCTION
  2. MATERIALS AND METHODS
  3. RESULTS AND DISCUSSION
    1. Purity and morphology measurements
    2. X-ray photoemission
    3. Raman scattering
  4. CONCLUSION

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KEYWORDS and PACS

PACS

  • 61.46.Fg

    Nanotubes

  • 63.22.-m

    Phonons or vibrational states in low-dimensional structures and nanoscale materials

  • 73.22.-f

    Electronic structure of nanoscale materials and related systems

  • 78.67.Ch

    Nanotubes

  • 79.60.-i

    Photoemission and photoelectron spectra

  • 78.30.Na

    Fullerenes and related materials

ARTICLE DATA

PUBLICATION DATA

ISSN

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

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    References

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