纳米石墨烯微通道板的场发射特性  

The Field Emission of Nanographene Micro-channel Plates

作　　者：吴大军 钱斌[1] 王连卫[2] WU Dajun;QIAN Bin;WANG Lianwei(School of Physics and Electronic Engineering,Changshu Institute of Technology,Changshu 215500;Department of Electronic Engineering,School of Information Science and Technology,East China Normal University,Shanghai 200062,China)

机构地区：[1]常熟理工学院物理与电子工程学院,江苏常熟215500 [2]华东师范大学信息科学技术学院电子工程系,上海200062

出　　处：《常熟理工学院学报》2018年第5期13-18,共6页Journal of Changshu Institute of Technology

基　　金：国家自然科学基金项目"新型过渡金属磷化物钠离子电池负极材料的可控合成及同步辐射研究"(11705015)

摘　　要：纳米石墨烯丰富的尖端和缺陷能够提高材料的场发射性能.然而其与衬底的粘附性差导致在场发射过程中容易发生真空间隙击穿,引起器件失效.本文采用新颖的溶剂热渗碳方法制备了纳米石墨烯包覆硅微通道板,形成石墨烯微通道板(MLG-MCPs).纳米石墨烯的表面形貌和晶体机构由Raman和TEM进行表征,MLG横向尺寸50～100 nm,呈涟漪和褶皱形状,具有较高的结晶度.场发射测试结果显示800℃退火能增加缺陷密度,降低功函数,开启电场降至2.0 V/μm(10μA/cm^2),显示了较好的场发射特性.The nanographene with dense tips and defects can improve the performance of the field emission.However,the poor adhesivity of nanographene and substrate is likely to lead to the breakdown of the vacuum gap during the field emission,and ultimately to the component failure.In this paper,the nanographene on nickelcoated silicon microchannel plates(Ni/Si-MCPs)was prepared by the method of hydrothermal carburization and thermal annealing to produce the multi-layer graphene on the surface of the Ni/Si-MCPs(MLG-MCPs).The microstructure and surface morphology were investigated by Raman and TEM,and field emission(FE)studies were also conducted by the electrochemical station,indicating that the MLG-MCPs delivered a better FE performance than Ni/Si-MCPs,which contributed to the characteristic of nanographene with ripple,wrinkle and better crystallinity.The turn-on field of the sample was annealed at 800℃was 2.0 V/μm at a current density of 10μA/cm2,which was ascribed to nanographene with more defect density,reducing the work function and promising field emission characteristic.

关 键 词：纳米石墨烯 硅微通道板 场发射 电子发射 渗碳 

分 类 号：O469[理学—凝聚态物理]