丝网印刷制备碳纳米管阴极的强流脉冲发射特性研究  

Research on intense pulsed emission of screen-printed carbon nanotube cathode

作　　者：廖庆亮[1] 张跃[1] 夏连胜[2] 齐俊杰[1] 黄运华[1] 邓战强[1] 高战军[1] 曹佳伟[1] 

机构地区：[1]北京科技大学材料物理与化学系,北京100083 [2]中国工程物理研究院流体物理研究所,绵阳621900

出　　处：《物理学报》2008年第4期2328-2333,共6页Acta Physica Sinica

基　　金：国家重点基础研究发展规划(批准号:2007CB936201);国家高技术研究发展计划(批准号:2006AA03Z351);国家自然科学基金重大国际合作项目(批准号:50620120439);科学技术部国际合作计划重点项目(批准号:2006DFB51000)资助的课题~~

摘　　要：采用丝网印刷法制备了一种大面积的碳纳米管阴极,表征了阴极表面碳纳米管的形貌及分布.研究了该阴极在不同脉冲条件下的高压脉冲发射特性,分析了发射时阴极面等离子体产生和发射点的分布.研究表明:碳纳米管阴极的脉冲发射机制为爆炸电子发射,在平均场强为16.7V/μm的单脉冲电场下,阴极的最高发射电流密度为99A/cm2.在平均场强为15.4V/μm的双脉冲电场下,阴极的最高发射电流密度为267A/cm2.碳纳米管阴极可以作为强流电子束源在高能微波器件中得到应用.A high-intensity cold cathode based on field emission from multi-walled carbon nanotubes was fabricated by screen-printing. The high intensity was obtained when the cathode was subjected to a pulsed electric field. The emission properties of the cathode were investigated in both single-pulse and double-pulse mode experiments. Emission photos of the cathode surface were investigated, and the pulsed emission mechanism of the carbon nanotube was explosive electron emission. In the single-pulse mode, the field emission current density is 99 A/cm^2 at an applied electric field of 16.7 Vμm. In the double-pulse mode, the emission current density can reach 267 A/cm^2 at an applied electric field of 15.4 V/μm. This carbon nanotube cathode appears to be suitable for high-power microwave device applications.

关 键 词：强流脉冲电子束 碳纳米管 阴极 丝网印刷 

分 类 号：O462[理学—电子物理学]