Excellent Field Emitters: Onion-Shaped Tipped Carbon Nanotubes
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- 作者：Junqing Hu ; Rujia Zou ; Yangang Sun ; Zhigang Chen
- 刊名：Journal of Physical Chemistry C
- 出版年：2010
- 出版时间：May 13, 2010
- 年：2010
- 卷：114
- 期：18
- 页码：8282-8286
- 全文大小：250K
- 年卷期：v.114,no.18(May 13, 2010)
- ISSN：1932-7455
文摘
Large-scale synthesis of highly graphitic carbon nanotubes (with a diameter of 5−8 nm) from a thermal reaction of activated carbon and Bi2O3 powders, which was grown via a carbon-thermal reduction and Bi catalyzed vapor−liquid−solid process has been obtained. Individual carbon nanotubes were terminated with an onion-shaped carbon tip, which has never been observed in growth of a carbon nanotube. Field emitters made from the present carbon nanotubes exhibit excellent emission properties: they can be operated at a very large current density of 145 mA/cm2 at a low voltage of 5.5 V/μm, and possess a long period (>32 h) of high emission stability at a high emission current density of 9 mA/cm2 and under a constant applied voltage. These properties are equally important for high image quality in field emission display fabrication. Hence, as-fabricated CNTs could act as excellent electron emitters and have great potential application in field emission panel displays.