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Electron holography of field-emitting carbon nanotubes
John Cumings1, A Zettl, M R McCartney
1Department of Physics, University of California at Berkeley, Berkeley, California 94720, USA.
Physical Review Letters
|February 28, 2002
Abstract:
Electron holography performed in situ inside a high resolution transmission electron microscope has been used to determine the magnitude and spatial distribution of the electric field surrounding individual field-emitting carbon nanotubes. The electric field (and hence the associated field emission current) is concentrated precisely at the tips of the nanotubes and not at other nanotube defects such as sidewall imperfections. The electric field magnitude and distribution are stable in time, even in cases where the nanotube field emission current exhibits extensive temporal fluctuations.