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There have been studied the Current-Voltage Characteristics (CVC) of a field
emission cathode on the basis of carbon nanotubes (CNT). It is shown that the origin of a
deviation of these characteristics from the classical Fowler-Nordheim dependence, observed at
low voltages and currents, is caused by a statistical spread of geometrical parameters of
individual nanotubes. The interconnection between the magnitude of the relative dispersion of
the electrical field amplification factor γ and the shape of CVC has been established
assuming the normal distribution of that. This interconnection is used for processing the CVC
measured by various authors. The results obtained imply a considerable statistical spread of
the amplification factor Δγ/γ = 0,1 - 0,3.
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