测试环境对碳纳米管场发射性能的影响

功能材料, 2010, 41(8): 1357-1360.

测试环境对碳纳米管场发射性能的影响

陈伟中 ^1, , 王蜀霞 ^2, , 贺叶露 ^3, , 陈西浩 ^4, , 杜声玖 ^5,

1.重庆大学,数理学院应用物理系,重庆,400044

2.重庆大学,数理学院应用物理系,重庆,400044

3.重庆大学,数理学院应用物理系,重庆,400044

4.重庆大学,数理学院应用物理系,重庆,400044

5.重庆大学,数理学院应用物理系,重庆,400044

基金项目: 国家自然科学基金(60976055)

关键词：碳纳米管 , 丝状阴极 , 场发射 , 密度泛函理论

Effects of test environment on the field emission properties of carbon nanotubes

采用CVD法在Ni丝上直接沉积碳纳米管,并应用二极管结构对其场发射性能进行测试,测试结果表明:(1)碳管表面态对其场发射稳定性影响明显,运用密度泛函平面波赝势方法(PWP)和广义梯度近似(GGA)对碳管表面吸附水分子前后电子能带结构和态密度作比较,发现吸附水分子后碳管功函数降低,费米能级处电子态密度增大,有利于增大碳管场发射电流;(2)高真空是获得碳管场发射稳定性一个必要条件;(3)荧光粉对碳管场发射电流也有一定贡献,但大的场发射电流情形下可忽略其影响.

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测试环境对碳纳米管场发射性能的影响

Effects of test environment on the field emission properties of carbon nanotubes

参考文献