磁场后处理增强碳纳米管场发射特性的研究  

Enhancement of Field Emission Characteristics of Carbon Nanotubes Cathode after Exposure to Magnetic Field

作　　者：林金阳[1] 张永爱[2] 杨尊先[2] 郭太良[2] 

机构地区：[1]福建工程学院电子电气系,福州350108 [2]福州大学光电显示技术研究所,福州350002

出　　处：《真空科学与技术学报》2014年第1期96-99,共4页Chinese Journal of Vacuum Science and Technology

基　　金：国家自然科学基金项目(61106053);福建省自然科学基金项目(2012D068;2013J01236);福建工程学院基金项目(GY-Z13040)

摘　　要：采用磁场后处理法改变碳纳米管的表面结构,增强了碳纳米管场发射性能。采用SEM对样品的处理前后的形貌进行了表征,场发射的数据显示,相对于,未经过任何处理的碳纳米管阴极,磁场后处理过的碳纳米管冷阴极的开启电场(电流密度为0.1 mA/cm2时的电场)由1.05降低到0.73 V/μm,场增强因子从1656增加到2045,场发射的亮度及均匀度均得到改善。相对其它后处理方法,磁场后处理法是一种简单、经济且有效的增强碳纳米管的场发射特性的方法。A novel technique was developed to considerably improve the field emission characteristics of the carbon nano-tubes（CNTs）. In the newly-developed technique, the purified, de-brindled, and sintered CNTs were exposed to the magnetic field （0.5 T） for 4 h. The microstmctures and emission properties of the CNTs were characterized with scanning electron microscopy, and field emission probe. The results show that the exposure to magnetic field significantly enhanced the field emission characteristics. For example, its onset field was found to drop from 1.05 to 0.7 3 V/tma; its emission current density increased up to 0.1 mA/cm2;and its field enhancement factor increased from 1656 to 2045. In addition, when it comes to the emission uniformity, the CNTs, exposed to the magnetic field, outperforms the control sample. Possi- ble mechanisms responsible for the enhancement were also tentatively discussed.

关 键 词：碳纳米管 场致发射 磁场TB332 

分 类 号：TN873[电子电信—信息与通信工程]