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

Jun Soo Han, Sang Heon Lee, Hanbin Go, Soo Jin Kim, Jun Hong Noh, Cheol Jin Lee

Research output: Contribution to journalArticlepeer-review

3 Citations (Scopus)

Abstract

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 μm. The cold cathode X-ray tube using the CNT field emitter presents an extremely high tube current density of 152 A/cm2 (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.

Original languageEnglish
Pages (from-to)10231-10241
Number of pages11
JournalACS nano
Volume16
Issue number7
DOIs
Publication statusPublished - 2022 Jul 26

Keywords

  • carbon nanotube
  • cold cathode X-ray tube
  • emission current
  • emission current density
  • emission stability
  • field electron emitter
  • focal spot size

ASJC Scopus subject areas

  • Materials Science(all)
  • Engineering(all)
  • Physics and Astronomy(all)

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