碳纳米管具有一些特殊的物理性质，其中潜藏着重要的技术价值。从理论上具体研究了金属型碳纳米管周围的电势分布、纳米管表面电荷分布及其尖端附近的电场强度等静电特性，结果显示长径比小的碳纳米管尖端处所集聚电荷密度的相对值大，而长径比大的碳纳米管尖端处所集聚电荷密度的绝对值大，并且碳纳米管的尖端电场强度有很大的加强。这对理论上进一步探索碳纳米管的场发射机制有积极意义。

Carbon nanotubes(CNTs) have some special physic properties which may own important technical values. We studied the electric characteristics of metallic carbon nanotubes including potential distribution, surface charge distribution and tip electric field based on electromagnetic theory. Our results show that the relative values of tip charge densities of short CNTs are bigger and so are the absolute values for long CNTs. We also find the electric field at the tips of metallic nanotubes is much bigger than external electric field. This is helpful for exploring theoretical problems about CNTs' field emission.

O441.1 O482.4

重庆师范学院 2 0 0 2年度科研基金