Millimeter-Long Carbon Nanotubes: Outstanding Electron-Emitting Sources
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- 作者：Néstor Perea-López ; Bernabé Rebollo-Plata ; Juan Antonio Briones-León ; Aarón Morelos-Gómez ; Daniel Hernández-Cruz ; Gustavo A. Hirata ; Vincent Meunier ; Andrés R. Botello-Méndez ; Jean-Christophe Charlier ; Benji Maruyama ; Emilio Muñoz-Sandoval ; Florentino López-Urías ; Mauricio Terrones ; Humberto Terrones
- 刊名：ACS Nano
- 出版年：2011
- 出版时间：June 28, 2011
- 年：2011
- 卷：5
- 期：6
- 页码：5072-5077
- 全文大小：909K
- 年卷期：0
- ISSN：1936-086X
文摘
We are reporting the fabrication of a very efficient electron source using millimeter-long and highly crystalline carbon nanotubes. These devices start to emit electrons at fields as low as 0.17 V/μm and reach threshold emission at 0.24 V/μm. In addition, these electron sources are very stable and can achieve a peak current density of 750 mA cm–2 at only 0.45 V/μm. In order to demonstrate intense electron beam generation, these devices were used to produce visible light by cathodoluminescence. Finally, density functional theory calculations were used to rationalize the measured electronic field emission properties in open carbon nanotubes of different lengths. The modeling establishes a clear correlation between length and field enhancement factor.