Study on Pyramidal Molybdenum Nanostructures Cold Cathode with Large-Current Properties Based on Self-Assembly Growth Method
Study on Pyramidal Molybdenum Nanostructures Cold Cathode with Large-Current Properties Based on Self-Assembly Growth Method
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基于自组装生长方法的大电流金字塔形钼纳米结构冷阴极研究
DOI：
10.1021/acsami.0c09345
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发表时间：
2020
影响因子：
9.5
通讯作者：
Shaozhi Deng
中科院分区：
文献类型：
--
作者：
Yan Shen;Yuchen Han;Runze Zhan;Peng Zhao;Yu Zhang;Fei Liu;Jun Chen;Juncong She;Ningsheng Xu;Shaozhi Deng
为了研制出适用于功率真空电子器件的场发射冷阴极，必须实现大电流和高电流密度的特性。这就要求设计和制备出结晶性好、几何结构合适、接触界面良好的冷阴极材料。在这项研究中，我们报告了一个金字塔状的钼纳米结构与单晶的性质，这是自组装生长的热蒸发方法。我们还报告了纳米结构的优化，成功地锐化了其顶端，并减少了结构和衬底之间的中间层的厚度（从31.4到3.1 nm）。通过这种方式，金字塔状钼纳米结构表现出约1.8 × 105Ω-1cm-1的高电导率。由这些纳米结构组成的冷阴极表现出大电流场发射性能，在高达28 V μm-1的脉冲电场下，最大发射电流为47.62 mA，最高电流密度为2.38 A cm-2。这种金字塔状钼纳米结构为大电流冷阴极的制备提供了一种可能。
In order to develop a field emission cold cathode for power vacuum electronic device applications, it is important to realize the properties of large-current and high current density. This requires the design and preparation of cold cathode materials with good crystallization, suitable geometric structure, and good contact interface. In this study, we report a pyramidal molybdenum nanostructure with single crystalline nature, which was self-assembly grown by a thermal evaporation method. We also report the optimization of the nanostructure, successfully sharpening its top end and reducing the thickness of the intermediate layer between the structure and the substrate (from 31.4 to 3.1 nm). By this way, the pyramidal molybdenum nanostructure exhibits high conductivity of about 1.8 × 105Ω–1cm–1. The cold cathode composed by these nanostructures shows a large-current field emission performance, with the largest emission current of 47.62 mA as well as the highest current density of 2.38 A cm–2, under a pulsed electric field as high as 28 V μm–1. The proposed pyramidal molybdenum nanostructures provide a candidate for the large-current cold cathode of the power electronic devices.