大电流碳纳米管场发射阴极研究  

Study on large current field-emission carbon nanotube cathode

作　　者：崔云康[1,2] 张晓兵[2] 雷威[2] 王琦龙[2] 狄云松[2] 李驰[2] 陈静[1] 

机构地区：[1]南京工程学院数理部,南京211167 [2]东南大学电子科学与工程学院,南京210096

出　　处：《强激光与粒子束》2013年第6期1509-1512,共4页High Power Laser and Particle Beams

基　　金：国家自然科学基金项目(51120125001;60971017;61101023);江苏省高校自然科学基础研究项目(12KJB510004);南京工程学院校级科研基金项目(CKJ2010013;YKJ201112;ZKJ201204;CKJA201207)

摘　　要：报道了在较大发射面积上获得较大场发射电流的碳纳米管场发射阴极。为了加强场发射电流,在丝网印刷浆料中增加一种金属纳米颗粒,金属颗粒增强了碳纳米管发射体和衬底的接触,提高碳纳米管和衬底的粘附作用。利用改进后的丝网印刷方法制备了大电流碳纳米管场发射阴极,测得最大发射电流为68.0mA,阴极有效发射面积约1.1mm2,发射电流密度约6.2A/cm2;并成功将改进方法制备的大电流场发射碳纳米管阴极应用于场发射真空器件原型。实验证明这种具有较大发射电流和较大发射电流密度的场发射能够满足部分大功率电子器件的需求。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 CNT’s 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.

关 键 词：场发射 碳纳米管 发射阴极 电流密度 

分 类 号：O462.4[理学—电子物理学]