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采用悬浮球模型,结合对称的镜像电荷层方法,对静电场中纳米碳管阵列的场增强因子进行了计算,并在考虑极板间距的情况下,对其计算结果做了修正.结果表明:纳米碳管阵列的间距对纳米碳管阵列的场发射性能影响很大.当纳米碳管阵列中碳管间距小于碳管高度时,场增强因子随间距的减小而急剧减小;而当碳管间距显著大于碳管高度时,场增强因子几乎不变.但当考虑阴阳极之间单位面积通过的场发射电流时,可论证当管间距与管高度相若时,能使场发射电流密度最佳(最大).另外,极板间距对场增强因子的影响很小,但是可以通过减小极板间距,来降低纳米碳管作为场发射体的场发射的开启电压,优化纳米碳管的场发射性能.
The field enhancement factor of the carbon nanotube array in the electrostatic field is calculated by using the suspension ball model and the symmetrical image charge layer method, and the calculation results are corrected considering the plate spacing. The results show that: When the distance between carbon nanotubes in carbon nanotube arrays is less than the height of carbon nanotubes, the field enhancement factor decreases sharply with the decrease of distance between carbon nanotubes. When carbon When the tube spacing is significantly greater than the carbon tube height, the field enhancement factor is almost constant, but when considering the field emission current per unit area between cathode and anode, it can be demonstrated that when the tube spacing is similar to the tube height, the field emission current density In addition, the effect of plate spacing on the field enhancement factor is small, but it can be achieved by reducing the plate spacing to reduce the turn-on voltage of the field emission of the carbon nanotube as a field emitter and optimize the carbon nanotube Field emission performance.