期刊論文
| 學年 | 92 |
|---|---|
| 學期 | 2 |
| 出版（發表）日期 | 2004-04-01 |
| 作品名稱 | Gas molecule effects on field emission properties of single-walled carbon nanotube |
| 作品名稱（其他語言） | |
| 著者 | Chen, Chun-Wei; Lee, Ming-hsien; Clark, S.-J. |
| 單位 | 淡江大學物理學系 |
| 出版者 | Switzerland: Elsevier |
| 著錄名稱、卷期、頁數 | Diamond and Related Materials 13(4-8), pp.1306-1313 |
| 摘要 | The effective workfunctions of single-walled carbon nanotubes (5,5) (SWNTs) with various geometries and adsorbates under external electric field have been calculated by the ab initio plane-wave, pseudopotential method. The capped, open-ended, and close-ended nanotubes show the workfunctions of 4.8 eV, 4.43 eV and 3.75 eV, respectively, and these results exhibit a good agreement with experiments. Under external electric field, the effective workfunction is further reduced due to the charge redistribution at the nanotube tip. In addition, the effects of participation of foreign adsorbates on the nanotube surface both physically and chemically on the variations of workfunctions have also been studied. In the physisorption process, the electrostatic interaction between adsorbates and nanotubes plays an important role under external electric field. The polar molecules like water have a large binding energy with the nanotube under electric field. These molecules act as tunneling states for electrons emitting from the nanotube tip into the vacuum. In the chemisorption process, the variations of effective workfunctions can be understood in terms of the surface dipole of the terminated bond due to the different electronegativity between nanotubes and adsorbates. |
| 關鍵字 | Carbon nanotube; Filed emission; Workfunction; First-principles |
| 語言 | en |
| ISSN | 0925-9635 |
| 期刊性質 | 國外 |
| 收錄於 | SCI |
| 產學合作 | |
| 通訊作者 | Chen, Chun-Wei |
| 審稿制度 | 是 |
| 國別 | CHE |
| 公開徵稿 | |
| 出版型式 | 電子版 |
| 相關連結 |
機構典藏連結 ( http://tkuir.lib.tku.edu.tw:8080/dspace/handle/987654321/27460 ) |