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We report an electrical characterization of nanographite fibers (NGFs) by measuring current–voltage characteristics of the individual NGFs in air at room temperature in order to optimize the NGF mass production process. The NGFs were synthesized by thermal chemical vapor deposition with thermal annealing. The NGF contains many defects in comparison with a multiwalled carbon nanotube (MWNT) synthesized by arc discharge, which can be clearly confirmed in the current–voltage characteristic. The maximum current density, however, is typically 10[sup 8] A/cm[sup 2], which is comparable to that in the MWNT. The high-density current operation mechanism is inferred from the measured diameter dependence of the current-voltage characteristic in various diameter NGFs. © 2003 American Institute of Physics. [ABSTRACT FROM AUTHOR]

Abstract. Field emission from closed and open-ended multiwalled nanotubes (MWNTs) was studied by field-emission microscopy. As an application of nanotube field emitters, we manufactured lighting elements with the structure of a triodetype vacuum tube by replacing the conventional thermionic cathodes with the MWNT field emitters. Stable electron emission, adequate luminance and long life of the tubes have been demonstrated. [ABSTRACT FROM AUTHOR]

Studies the geometrical structure and electronic properties of atomically resolved multiwall carbon nanotubes (MWNT) using scanning tunneling microscope. Correlation between the structure of the outer shell and the electronic properties; Interlayer stacking of MWNT; Different chiralities and diameters of tubes.