Overall control of field emission from carbon nanotube paste-emitters through macro-geometries for high-performance electron source applications
Overall control of field emission from carbon nanotube paste-emitters through macro-geometries for high-performance electron source applications
复制标题
DOI：
10.1016/j.carbon.2021.12.094
复制
发表时间：
2022-01-05
期刊：
影响因子：
10.9
通讯作者：
Song, Yoon-Ho
中科院分区：
文献类型：
--
作者：
Ahn, Yujung;Kim, Seong Jun;Song, Yoon-Ho
来自纳米级材料（如碳纳米管（CNTs））的场发射电子束具有基于性能、形状因素和可用性再生电子源器件的潜力。实际上，与传统的热电子器件相比，用强粘接碳纳米管粘贴发射器制造的数字x射线管产生非常短和精确的x射线脉冲，以最小的x射线剂量提供大大增强的x射线图像。尽管丝网印刷碳纳米管粘贴发射器已经研究了相当长的时间，但由于固有印刷特性、工艺可重复性和设备配置的复杂性，它们的场电子发射尚未完全理解或针对特定的电子源应用进行优化设计。在这里，我们报告了一种利用实验和计算模拟的方法来全面控制多点碳纳米管粘贴发射器的场电子发射，包括基于发射器点尺寸，点阵列分布和三极管配置的电子束轨迹。成功地提取了碳纳米管发射体的单位点尺寸和三极管结构的长宽比等关键因素，可用于设计和生产高性能场发射电子源器件。(c) 2022 Elsevier Ltd.版权所有。
Field-emitted electron beams from nanometer-scale materials like carbon nanotubes (CNTs) have the potential to regenerate electron source devices based on performance, form factor, and usability. Prac-tically, digital X-ray tubes fabricated with strongly adhesive CNT paste-emitters produce very short and exact X-ray pulses compared with conventional thermionic devices, providing greatly enhanced X-ray images with minimal X-ray dose. Although screen-printed CNT paste-emitters have been studied for a relatively long time, their field electron emissions have not been fully understood or optimally designed for specific electron source applications, because of the complexity arising from the intrinsic printing property, along with process reproducibility and device configurations. Here, we report an approach for the overall control of field electron emissions from multi-dot CNT paste-emitters, including electron-beam trajectories based on emitter dot size, dot array distribution, and triode configurations, using ex-periments and computational simulations. The crucial factors, such as the unit dot size of the CNT emitters and the aspect ratio of the triode structure, were successfully extracted, and can be used in designing and producing high-performance field-emitted electron source devices. (c) 2022 Elsevier Ltd. All rights reserved.