大电流碳纳米管场发射体及其长期稳定性研究  

High-current field emitter based on carbon nanotubes and its long-term current stability

作　　者：佟钰[1] 张婷[1] 王琳[1] 谢巧玲[1] 

机构地区：[1]沈阳建筑大学材料科学与工程学院,辽宁沈阳110168

出　　处：《电子元件与材料》2014年第8期56-58,共3页Electronic Components And Materials

基　　金：教育部留学归国人员科研启动基金资助项目

摘　　要：为获取亮度高、使用寿命长的场发射电子源，以具有宏观长度的定向单壁碳纳米管绳为研究对象，考察了测试样品对场发射电流的极限负载能力及其在高真空、大电流条件下的发射稳定性。研究结果表明，单根直径约100μm的碳纳米管绳即可负载高达1-3mA的场发射电流；在恒压、大电流（约0．7mA）情况下的稳定性测试中，样品仍表现出较高的发射稳定性，9h电流衰退值为25％～35％，且稳定性随工作电压的降低而进一步改善；ZnO纳米涂层对碳纳米管绳发射稳定性有一定的改善作用。In order to develop a high-brightness field emitter with excellent emission stability, macroscopically long rope of aligned single-walled carbon nanotubes （SWCNTs） was employed for field emission measurements to determine the maximum capacity of emitting current from an isolate SWCNT rope and its emission stability under the conditions of ordinary high vacuum and very large current. The experimental results show that an emission current up to 1-3 mA can be realized from a SWCNT rope （100 μm in a diameter）; during the emission stability test under instant voltage mode with an initial current of about 0.7 mA, a gradual degradation of the emission current ultimately gives rise of a current loss of 25% -35%, which is evidently depending on the working voltage. It is also found that the involvement of ZnO nanolayer coating onto the CNT surface presents a detectable improvement to the long-term stability.

关 键 词：碳纳米管 场发射 稳定性 工作电压 高真空 氧化锌 

分 类 号：TN105.1[电子电信—物理电子学]