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以纳米碳管阵列为研究对象,利用镜像悬浮球模型及Fowler-Nordheim电流密度公式,对纳米碳管阵列的场发射电流密度进行计算,进而综合考虑场发射增强因子及场发射电流密度对纳米碳管阵列场发射性能进行定量优化.参考碳管阵列场发射电流密度最大值及场发射增强因子,表明当纳米碳管阵列间距为碳管高度十分之一时,纳米碳管阵列的场发射性能得到优化.与以前的理论估算结果相比,优化的阵列间距进一步减小.当纳米碳管间距过大,场发射增强因子增加,而场发射电流密度会在更大程度上减小;当纳米碳管密度较大时,场发射增强因子受到静电屏蔽的影响而急剧下降.
Taking the carbon nanotube array as the research object, the field emission current density of the carbon nanotube array was calculated by using the image-suspended spherical model and the Fowler-Nordheim current density formula. Then, the field emission enhancement factor and the field emission current density The results show that when the carbon nanotube array spacing is one tenth of the height of the carbon nanotube, the field emission properties of the carbon nanotube array Is optimized.Compared with the previous theoretical results, the optimized array spacing is further reduced.When the spacing of carbon nanotubes is too large, the field emission enhancement factor increases and the field emission current density decreases to a greater extent. When the nano When the carbon nanotube density is large, the field emission enhancement factor drops sharply under the influence of electrostatic shielding.