摘要
简要介绍了场致发射的原理及其相比于热电子发射的优势,阐述了碳纳米管场发射的性能和基于碳纳米管(CNT)场发射X射线管电子源的典型结构,重点讨论了三极式与二极式碳纳米管冷阴极X射线管电子源的最新研究进展和碳纳米管X射线源的成像技术应用。今后碳纳米管场发射冷阴极取代传统的热阴极应用于X射线管电子源,可制成高时间分辨率、体积小、脉冲响应、能耗低和寿命长的微型X射线管,基于这些优势衍生出的新型X射线成像技术将推动临床医疗、安检和工业检测等领域的技术革新。
The principle of the field emission and its advantages compared with the thermionic emission are briefly introduced,and the performances of the carbon nanotube（CNT）field emission and typical structures of the X-ray tube electron source based on the CNT field emission are presented.The latest research progresses in the triode and diode CNT-based cold cathode X-ray tube electron source are emphatically discussed.And the CNT-based X-ray imaging technique and its application are also introduced.The CNT field emission cold cathode replacing hot cathode for the X-ray tube electron source has gradually become a research hotspot,and the micro X-ray tube based on the CNT field emission cold cathode has the advantages of high time resolution,small size,pulse response,low energy consumption and long life,etc.The new X-ray imaging technique derived from the aforementioned advantages will promote the technology innovation in the areas of the clinical medical,security and industrial detection and so on.
出处
《微纳电子技术》
CAS
北大核心
2015年第11期681-687,728,共8页
Micronanoelectronic Technology
基金
国家自然科学基金青年科学基金资助项目(11304159)
江苏省自然科学基金青年基金资助项目(BK20140870
BK20140890)
南京邮电大学引进人才项目(NY213078
NY214045)
关键词
碳纳米管
场发射
X射线管
冷阴极
阳极靶
carbon nanotube
field emission
X-ray tube
cold cathode
anode target
