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Schematic configuration of FEM apparatus.
SEM images of a CNT attached on a tungsten tip (a) before and (b) after MgO coating.
Voltage-current curves of field emission from the CNT with and without MgO coating, respectively. The arrows show the turn-on and turn-off directions of the current during a voltage scanning cycle.
Model of the simulation using finite element method.
Distributions of the electric field and potential on the CNT before and after MgO coating calculated by a finite element method.
FEM images of the emission patterns for the CNT (a) before and (b) after MgO coating.
Fluctuations of emission current for the CNT before and after MgO coating at the emission level of (a) and (b) , respectively.
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