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SEM images of porous carbon prepared from sphere of (a) 550 nm and (b) 120 nm.
TEM image and the electron diffraction pattern of porous carbon.
(a) FE characteristics for the electrodes distance of . (b) FN plots of the current-voltage characteristics.
Dependence of effective emission area on pore size.
Emission site of porous carbon.
Dependence of threshold electric field on temperature.
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