Field emission properties of capped carbon nanotubes doped by alkali metals: a theoretical investigation

被引：9

作者：

Jin Lei ^{[1
]}

Fu Hong-Gang ^{[1
,2
]}

Xie Ying ^{[2
]}

Yu Hai-Tao ^{[2
]}

机构：

[1] Harbin Inst Technol, Sch Chem Engn & Technol, Harbin 150001, Peoples R China

[2] Heilongjiang Univ, Minist Educ, Key Lab Funct Inorgan Mat Chem, Harbin 150080, Peoples R China

来源：

CHINESE PHYSICS B | 2012年 / 21卷 / 05期

基金：

中国国家自然科学基金;

关键词：

field emission; density functional theory; carbon nanotube; alkali metal; ADSORPTION; ENHANCEMENT; TIPS;

D O I：

10.1088/1674-1056/21/5/057901

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

The electronic structures and field emission properties of capped CNT55 systems with or without alkali metal atom adsorption were systematically investigated by density functional theory calculation. The results indicate that the adsorption of alkali metal on the center site of a CNT tip is energetically favorable. In addition, the adsorption energies increase with the introduction of the electric field. The excessive negative charges on CNT tips make electron emittance much easier and result in a decrease in work function. Furthermore, the inducing effect by positively charged alkali metal atoms can be reasonably considered as the dominant reason for the improvement in field emission properties.

引用

页数：5

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