实验测出了这种阴极在适当条件下的功函数值为2 . 86电子伏特左右，低于钨阴极的功函数值。
The experiment results show that the cathode work function, which is lower than tungsten cathode's, is about 2.86 eV in a available condition.
尤其是它具有大的长径比，低的功函数，良好的导电性和纳米级的尖端，使其能够在相对较低的电压下就能长时间地 发射 电子，因此被认为是一种优良的 场 致 发射阴极。
The reason, Fang says, is simple: Carbon nanotubes have a very low field-emission voltage, which means lower voltage is needed to emit the electrons that produce an image.
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