Electron emission and structure stability of carbon nanotube cold cathode driven by millisecond pulsed voltage
Electron emission and structure stability of carbon nanotube cold cathode driven by millisecond pulsed voltage
复制标题
毫秒脉冲电压驱动碳纳米管冷阴极电子发射及结构稳定性
DOI：
10.1016/j.vacuum.2019.109071
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发表时间：
2020-02
期刊：
影响因子：
4
通讯作者：
Deng Shaozhi
中科院分区：
文献类型：
--
作者：
Zhang Yu;Tan Yuanming;Wang Lizhou;Li Baohong;Ke Yanlin;Liao Meixiang;Xu Ningsheng;Chen Jun;Deng Shaozhi
碳纳米管（CNT）冷阴极可以为微波器件提供高电流和电流密度，通常工作在脉冲模式下。本文研究了碳纳米管冷阴极在毫秒脉冲模式下的电子发射特性和结构稳定性。峰值电流和平均电流都是影响冷阴极性能的关键参数。提高占空比是提高冷阴极平均电流和平均功率的有效途径。通过调整脉冲宽度、脉冲间隔时间和占空比，优化了CNT冷阴极的脉冲场发射特性。毫秒脉冲模式下的平均电流比微秒脉冲模式下的平均电流大三个数量级。平均电流也随占空比线性增加。研究了脉冲和直流场发射后碳纳米管薄膜的形貌，揭示了碳纳米管薄膜的稳定性和真空击穿机理。分析了碳纳米管的热平衡，揭示了其内在机理。为碳纳米管冷阴极在高功率微波器件中的应用提供了一种可行的策略。
The carbon nanotube (CNT) cold cathode can provide a high current and current density for microwave devices, which normally work under pulse mode. In this work, we studied the electron emission characteristics and strucutre stability of a CNT cold cathode in millisecond pulse mode. Peak current and average current are both key parameters for the performance of cold cathode. Increasing the duty ratio proved an effective way to increase the average current and average power of the cold cathode. The pulsing field emission characteristics of CNT cold cathode was optimized by modulating the pulse width, pulse interval time, and duty ratio. The average current in millisecond pulse mode was three orders of magnitude greater than that when using microsecond pulses. The average current also linearly increased with the duty ratio. The morphology of CNT films after pulsing and DC field emission was investigated to reveal the stability and the vacuum breakdown mechanism. The thermal equilibrium of the CNT was analyzed to reveal its underlying mechanism. This work provides a practical strategy for the application of CNT cold cathodes in high-power microwave devices.
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采用脉冲驱动模式的碳纳米管阴极产生非常高的场发射电流
影响因子：
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