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介绍了几种碳基材料的场发射特性及其发射模型。金刚石表面具有较低的或负的电子亲和势,因无法实现N型掺杂,难以用作电子发射材料。类金刚石膜及非晶碳膜材料经过“激活”后在表面形成具有较大场增强因子的熔坑,在几～几十V/μm的低阈值电场下得到非本征的电子发射,纳米结构的碳和碳纳米管本身具有较大的场增强因子,是较有前途的平面阴极场发射材料。碳基材料的导电性不同,遵循的发射模型不同。
The field emission characteristics and emission models of several carbon-based materials are introduced. Diamond surface has a low or negative electron affinity, because it can not achieve N-type doping, it is difficult to use as electron-emitting material. The diamond-like carbon film and the amorphous carbon film material form a crater with a larger field enhancement factor on the surface after being “activated”, and an extrinsic electron emission is obtained under a low threshold electric field of several to tens of V / μm, Nanostructured carbon and carbon nanotubes themselves have larger field enhancement factors and are more promising planar cathode field emission materials. Carbon-based materials have different conductivities and follow different emission models.