Outstanding field emission properties of titanium dioxide /carbon nanotube composite cathodes on 3D nickel foam
Outstanding field emission properties of titanium dioxide /carbon nanotube composite cathodes on 3D nickel foam
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3D泡沫镍上二氧化钛/碳纳米管复合阴极出色的场发射性能
DOI：
10.1016/j.jallcom.2017.08.026
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发表时间：
2017-12-05
影响因子：
6.2
通讯作者：
Wei Ou-Yang
中科院分区：
文献类型：
--
作者：
Wu, Yishan;Jun Li;Wei Ou-Yang
在三维（3D）泡沫镍（Ni-F）基底上丝网印刷二氧化钛（TiO 2）涂层碳纳米管（CNTs），即TiO 2/CNTs@Ni-F复合阴极，获得了优异的场发射性能。该器件具有相当低的开启场（0.40 V/pm）和阈值场（0.75 V/μ m），对应于27767的高场增强因子，以及优异的电流稳定性和发射均匀性。基于比较研究和提出的模型，场发射性能显着增强的原因被披露。TiO 2/CNTs微膜和Ni-F三维衬底的多级结构增强了边缘效应，同时降低了场屏蔽效应，这是降低工作电场的主要原因。此外，3D金属基底为TiO 2/CNT复合材料提供了良好的粘附性以及TiO 2改性剂的优异化学稳定性，从而有助于显着的电稳定性。TiO 2/CNTs@Ni-F复合阴极的高性能在真空电子器件中具有潜在的应用前景。(C)2017爱思唯尔B. V.保留所有权利。
Outstanding field emission properties are achieved for titanium dioxide (TiO2) coated screen-printed carbon nanotubes (CNTs) on a three-dimension (3D) nickel foam (Ni-F) substrate, namely the TiO2/CNTs@Ni-F composite cathode. The device exhibits pretty low turn-on field of 0.40 V/pm and threshold field of 0.75 V/mu m corresponding with a recorded high field enhancement factor of 27767, and excellent current stability as well as emission uniformity. Based on a comparison study and a proposed model, reasons for the significantly enhanced field emission properties are disclosed. The enhanced edge effect, simultaneously with the reduced field screening effect, arisen by TiO2/CNTs micro films and multistage structure of the 3D Ni-F substrate mainly contributes to the lowered operation fields. In addition, the 3D metal substrate provides good adhesion for the TiO2/CNTs composite together with the excellent chemical stability of the TiO2 modifier contributing to the remarkable electrical stability. The high-performance of the TiO2/CNTs@Ni-F composite cathode demonstrates potential applications in vacuum electronic devices. (C) 2017 Elsevier B.V. All rights reserved.