Thickness Effect on Field-Emission Properties of Carbon Nanotube Composite Cathode
Thickness Effect on Field-Emission Properties of Carbon Nanotube Composite Cathode
复制标题
厚度对碳纳米管复合阴极场发射性能的影响
DOI：
10.1109/ted.2018.2878738
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发表时间：
2019-01
影响因子：
3.1
通讯作者：
欧阳威
中科院分区：
文献类型：
--
作者：
宋玉洁;李俊;欧阳威
虽然低功函数材料已被广泛应用于碳纳米管（CNT）阴极的涂覆以提高其场发射性能，但除了少数例子外，关于涂覆层厚度影响的报道很少，其中一些观察结果相互矛盾。因此，本文采用低功函数的LiF/Al材料对碳纳米管阴极进行涂覆，并精确控制涂覆膜厚度，系统地研究了膜厚度对碳纳米管复合场发射器件场发射性能的影响。研究发现，场发射性能与阴极膜厚度之间存在非单调关系，其中Al层厚度为1 nm的碳纳米管复合阴极的场发射性能最优。根据实验数据和分析，发现非单调趋势与厚度相关电阻的行为很好地对应，因此主要归因于复合阴极的电导。此外，具有Al层的fed的稳定性和光照均匀性的改善归因于增加的有效发射位点和保护的鲁棒发射体。低功函数材料LiF/Al复合碳纳米管阴极的优异性能显示了其在真空电子器件中的应用潜力，而优化涂层厚度对于碳纳米管复合阴极的场发射增强具有重要意义。
Although low work function materials have been widely used to coat carbon nanotube (CNT) cathodes for improving field-emission performance, there have been few reports on the effect of coated layer thickness except for a few examples, in which some contradictory observations were reported. Hence, in this paper, we employed a low work function material of LiF/Al to coat CNT cathodes with the capability to precisely control the coated film thickness and systematically investigated the film thickness effect on field-emission properties of the CNT composite field-emission devices (FEDs). A nonmonotonic relationship between field-emission performance and cathode film thickness was observed and the state-of-the-art performance was optimally demonstrated for the CNT composite cathode with Al layer thickness of 1 nm. Based on experimental data and analysis, the nonmonotonic tendency was found to correspond well with the behavior of thickness-dependent resistance and thus was mainly assigned to the conductance of composite cathodes. In addition, the improved stability and lighting uniformity for the FEDs with an Al layer were attributed to the increased effective emission sites and the robust emitters being protected. The superior performance of the CNT cathode composited with a low work function material of LiF/Al demonstrates potential applications in vacuum electronic devices and an optimized thickness of the coated layer is important for field emission enhancement of CNT composite cathodes.
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影响因子：
4
作者：
K. J. Sankaran;K. Srinivasu;K. Leou;N. Tai;I. Lin
通讯作者：
K. J. Sankaran;K. Srinivasu;K. Leou;N. Tai;I. Lin
影响因子：
2.2
作者：
Houdellier, F.;de Knoop, L.;Snoeck, E.
通讯作者：
Snoeck, E.
影响因子：
6.7
作者：
A. Yutani;A. Kobayashi;A. Kinbara
通讯作者：
A. Yutani;A. Kobayashi;A. Kinbara
利用嵌入的银纳米颗粒增强自立式金刚石薄膜的导电性和电子场发射性能
影响因子：
3
作者：
Yanyan Shen;Yu Qiao;Zhiyong He;Shengwang Yu
通讯作者：
Shengwang Yu
影响因子：
4.1
作者：
Kennedy, J.;Fang, F.;Manikandan, E.
通讯作者：
Manikandan, E.