教師資料查詢 | 類別: 期刊論文 | 教師: 李明憲 LEE, MING-HSIEN (瀏覽個人網頁)

標題:Field penetration induced charge redistribution effects on the field emission properties of carbon nanotubes : a first-principle study
學年
學期
出版(發表)日期2004/04/30
作品名稱Field penetration induced charge redistribution effects on the field emission properties of carbon nanotubes : a first-principle study
作品名稱(其他語言)
著者Chen, C.-W.; Lee, Ming-hsien; Clark, S.-J.
單位淡江大學物理學系
出版者Netherlands: Elsevier
著錄名稱、卷期、頁數Applied Surface Science 228(1-4), pp.143-150
摘要The effect of field penetration induced charge redistribution on the field emission properties of carbon nanotubes (CNTs) have been studied by the first-principle calculations. It is found that the carbon nanotube becomes polarized under external electric field leading to a charge redistribution. The resulting band bending induced by field penetration into the nanotube tip surface can further reduce the effective workfunction of the carbon nanotubes. The magnitude of the redistributed charge ΔQ is found to be nearly linear to the applied external field strength. In addition, we found that the capped (9, 0) zigzag nanotube demonstrates better field emission properties than the capped (5, 5) armchair nanotube due to the fact that the charge redistribution of π electrons along the zigzag-like tube axis is easier than for the armchair-like tube. The density of states (DOS) of the capped region of the nanotube is found to be enhanced with a value 30% higher than that of the sidewall part for the capped (5, 5) nanotube and 40% for the capped (9, 0) nanotube under an electric field of 0.33 V/Å. Such enhancements of the DOS at the carbon nanotube tip show that electrons near the Fermi level will emit more easily due to the change of the surface band structure resulting from the field penetration in a high field.
關鍵字Field emission; Carbon nanotubes; First-principle; Workfunction
語言英文
ISSN0169-4332;1873-5584
期刊性質國外
收錄於
產學合作
通訊作者Chen, C.-W.
審稿制度
國別荷蘭
公開徵稿
出版型式紙本;電子版
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