单根碳纳米管场致发射表面电荷分布研究

Study on the Surface Charge Distribution of Single Carbon Nanotube in Field Emission

考虑碳纳米管尺寸及端帽形状,计算得到了比较精确的金属型纳米管表面电荷密度相对分布曲线。与先前的理论结果作比较,消除了曲线上的波动,曲线相对抬高,尖端附近电荷量所占比例减小。进一步研究了长度、半径和长径比对电荷密度相对分布曲线的影响,表明长度主要影响管身电荷密度相对分布,半径主要影响尖端电荷密度相对分布。在忽略其他条件影响下,长径比相同的碳纳米管,电荷密度相对分布曲线趋势完全相同。

Considering the geometrical figure of tube and tip, we calculated the surface charge density relative distribution curve of metallic carbon nanotube. Compared with the previous theoretic result, our curve rose apparently without fluctuation ,and the ratio of tip charge quantity decreased. Furthermore ,we studied the influence of length, radius and aspect ratio on the charge density relative distribution curve ,showing that length and radius play an important role in relative charge distribution of tube and in tip respectively. Without considering other aspects,carbon nanotubes with the same aspect ratio have entirely uniform trend in charge density relative distribution curve.