对碳纳米管阵列的场发射电场增强因子以及最佳阵列密度的研究

研究了外电场、碳纳米管自身线度、尤其管的阵列密度对碳纳米管的场发射性能的影响,从理论上深入探索碳纳米管阵列的电场增强因子并提出改善其场发射电子性能的有效途径.研究结果表明,碳纳米管阵列的电场增强因子的数量级一般为102—103,并对任何长径比的碳纳米管阵列,都对应着一个最佳阵列密度,当碳纳米管阵列密度取此最佳密度值时,其电场增强因子明显提高.这里的理论研究对弄清碳纳米管的场发射机理及实验合成高发射性能的碳纳米管阵列有一定的意义 关键词： 碳纳米管阵列 最佳阵列密度 电场增强因子 长径比

Study on the electric field enhancement factor and the optimum densities of carbon nanotube arrays

We explored how the emission characteristics of carbon nanotube arrays being influenced by the external electric field,the nanotuble size,and the density of nanotubes.The mechanism of the electric field enhancement was studied and the methods were suggested that are used to improve emitting property of nanotubes.The result indicates that the magnitude of electric field enhancement factor is between 10 2 and 10 3,and for any carbon nanotube arrays with concrete aspect ratios,there are always optimum densities that correspond their best electric field enhancement factors.These studies are helpful for exploration of field emission mechanism and fabrication of carbon nanotube material in experiments.