Single-wall carbon nanotubes synthesized by laser ablation in a nitrogen atmosphere

Applied Physics Letters

Volumn 73, Issue 26, 1998, Pages 3827-3829

  Zhang, Y ^a   Gu, H ^b   Iijima, S ^a,c  

^a NEC CORPORATION   (Japan)

^b JAPAN SCIENCE AND TECHNOLOGY AGENCY   (Japan)

^c MEIJO UNIVERSITY   (Japan)

Author keywords

[No Author keywords available]

Indexed keywords

ATOMS; CATALYSTS; COBALT; COMPOSITION; ELECTRON ENERGY LOSS SPECTROSCOPY; FULLERENES; GRAPHITE; NANOTUBES; NEODYMIUM LASERS; NICKEL; NITROGEN; TRANSMISSION ELECTRON MICROSCOPY;

AMORPHOUS CARBON; METAL PARTICLES; NITROGEN ATMOSPHERE; SINGLE WALL CARBON NANOTUBES;

LASER ABLATION;

EID: 0032576502     PISSN: 00036951     EISSN: None     Source Type: Journal    
DOI: 10.1063/1.122907     Document Type: Article

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14. We did observe some elongated graphite polyhedrons in a few occasions, but their aspect ratios are very small, usually less than 3. We have the similar result in the experiment using argon gas (see Ref. 13).
15. Such systematic variation can only be corrected to a certain degree in a 1D detector array using a standard correction method; however, using an energy shifted first-difference spectrum acquisition mode can remove this artifact almost completely. See F. R. Egerton, Electron Energy-Loss Spectroscopy in the Electron Microscope (Plenum, New York, 1996).
16. It holds only if the peak shapes of the normal spectra are similar. Since the K-edge intensity is decided by the p-projected density of electron states, it requires that the bonding nature of nitrogen does not change significantly.
17. The difference in the noise levels of spectra (c) and (d) is caused by the different specimen thickness of the scanned regions. At a thin region, such as the thin SWCNT bundle for spectrum (c), the total number of atoms contributing to inelastic scattering is smaller and the statistic error is larger within a fixed acquisition time.
18. The bond energies of C-C and C-N are 370 and 305 kJ/mol, respectively; H. O. Pierson, Handbook of Carbon, Graphite, Diamond and Fullerenes (Noyes, New Jersey, 1993), p. 32. This assumption is also supported by the fact that high temperature is preferred for fullerene formation (see Ref. 13).