注入通常需要低功函数 Low work function
铁电材料作为一种新型的阴极材料，具有真空要求低、制作简单、功函数低、响应速度快等特点。
The ferroelectric material is a novel cathode material, which is characterized by its low vacuum requirement, convenient fabrication, low work function and fast reactive rate.
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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