2013•High Power Laser and Particle BeamsRequires access

Study on large current field-emission carbon nanotube cathode

崔云康 Cui Yunkang, 张晓兵 Zhang Xiaobing, 雷威 Lei Wei, 王琦龙 Wang Qilong, 狄云松 Di Yunsong, 李驰 Li, 陈静 Chen Jing

Abstract

A large current and a high emission current density from printed carbon nanotube (CNT) are reported. To enhance the field-emission current, a small number of metal nano-particles were added to the CNT paste. The metal nano-particles enhanced the emitters-substrate contact and improved the CNTs adhesion properties. A large current of 68.0 mA is obtained from a cathode area of 1.1 mm2, and the high emission current density is about 6.2 A/cm2. The CNT cathode is applied to field-emission vacuum device prototype successfully. Experiments show that current and current density can meet the requirements for large current field-emission electron devices.

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Key concepts: Field electron emission, Cathode, Materials science, Carbon nanotube, Current (fluid), Current density, Optoelectronics, Substrate (aquarium)