High-Performance Cold Cathode X-ray Tubes Using a Carbon Nanotube Field Electron Emitter

被引：44

作者：

Han, Jun Soo ^{[1
]}

Lee, Sang Heon ^{[1
]}

Go, Hanbin ^{[1
]}

Kim, Soo Jin ^{[1
]}

Noh, Jun Hong ^{[2
]}

Lee, Cheol Jin ^{[1
]}

机构：

[1] Korea Univ, Sch Elect Engn, Seoul 02841, South Korea

[2] Korea Univ, Sch Civil Environm & Architectural Engn, Seoul 02841, South Korea

来源：

ACS NANO | 2022年

基金：

新加坡国家研究基金会;

关键词：

carbon nanotube; field electron emitter; cold cathode X-ray tube; emission current; emission current density; emission stability; focal spot size; EMISSION; FABRICATION; DESIGN;

D O I：

10.1021/acsnano.2c02233

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

A cold cathode X-ray tube was fabricated using a carbon nanotube (CNT) field electron emitter made by a free-standing CNT film which is composed of a highly packed CNT network. A lot of CNT bundles with a sharp tip are vertically aligned at the edge of the thin CNT film with a length of 10 mm and a thickness of 7 mu m. The cold cathode X-ray tube using the CNT field emitter presents an extremely high tube current density of 152 A/cm(2) (corresponding to tube current of 106.4 mA), the electron beam transmittance of 95.2% and a small focal spot size (FSS) of 0.5 mm. In addition, the cold cathode X-ray tube also shows stable lifetime during 100 000 shots. High emission current density of the cold cathode X-ray tube is mainly attributed to a lot of electron emission sites at an edge of the CNT film. The small FSS is caused by an ensemble of the CNT field electron emitter made by a free-standing thin CNT film and the optimized curve-shape elliptical focusing lens. Based on obtained results, the cold cathode X-ray tube can be widely used for various X-ray applications such as medical diagnosis systems and security check systems in the future.

引用

页码：10231 / 10241

页数：11

共 62 条

[1] Strong, Light, Multifunctional Fibers of Carbon Nanotubes with Ultrahigh Conductivity [J].