期刊
JOURNAL OF VACUUM SCIENCE & TECHNOLOGY B
卷 31, 期 1, 页码 -出版社
A V S AMER INST PHYSICS
DOI: 10.1116/1.4773058
关键词
-
资金
- German Federal Ministry of Education and Research (BMBF) [CarboFEM 03X0201A]
Carbon nanotubes (CNTs) are promising candidates as electron sources for novel x-ray tubes. Short pulses, high emission currents, and long-term stability are prerequisites for practical applications in medical x-ray imaging. Here, the authors present field emission from CNTs in pulsed operation mode exhibiting very high stability for 200 cumulative hours and a maximum current of 126 mA corresponding to 202 mA/cm(2) at an applied field of 9.3 V/mu m. They investigated the correlation of classical emitter characteristics such as threshold field and field enhancement factor to the long-term stability and maximum emission current. This correlation was found to be rather poor. Instead, they observed a steady voltage increase for a fixed current during lifetime experiments. This observation allowed to derive a degradation parameter which determines the emitter quality for pulsed applications. Detailed investigations of the degradation in dependency of pressure, duty cycle, and pulse-on time were performed to predict the stability and lifetime of CNT-based field emitters. (C) 2013 American Vacuum Society. [http://dx.doi.org/10.1116/1.4773058]
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据