碳纳米管发射电流密度不稳定性的理论探究  

Theoretical Study on the Instability of Emission Current Density of Carbon Nanotubes

作　　者：王益军[1] 王立[1] WANG Yijun;WANG Li(School of Physics and Electronic Engineering,Xianyang Normal University,Xianyang 712000,Shaanxi,China)

机构地区：[1]咸阳师范学院物理与电子工程学院,陕西咸阳712000

出　　处：《咸阳师范学院学报》2020年第2期25-28,共4页Journal of Xianyang Normal University

基　　金：国家自然科学基金项目(11605147);陕西省自然科学基金项目(2012JM1009);陕西省教育厅科研计划项目(12JK0984);咸阳师范学院科研基金项目(XSYK19028);咸阳师范学院教改项目(2019Y001)。

摘　　要：碳纳米管的发射电流密度不稳定问题严重困扰着人们对其进一步开发应用。为了探究其原因,本文基于密度泛函理论和金属电子论,提出了一种计算碳纳米管发射电流密度的公式,合理解释了引起电流密度振荡的原因是其态密度随电场增大而振荡式变化所导致,揭示了碳纳米管场致发射电流密度的变化规律。The further development and application of carbon nanotubes had been seriously baffled by the instability of their emission current density. To find out the reason, based on the theory of density functional theory and metal electron theory, a formula is proposed for calculating the emission current density of carbon nanotubes by this paper. Explicably, the reason for the oscillation of carbon current density is that its state density changes with the increase of electric field, which explains the variation law of the emission current density of carbon nanotubes in a wide range of electric fields.

关 键 词：碳纳米管 场致发射 电流密度 

分 类 号：O484.42[理学—固体物理]