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

doi:10.1021/acsnano.2c02233

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 journal › Article › peer-review

39 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 language	English
Pages (from-to)	10231-10241
Number of pages	11
Journal	ACS nano
Volume	16
Issue number	7
DOIs	https://doi.org/10.1021/acsnano.2c02233
Publication status	Published - 2022 Jul 26

Bibliographical note

Funding Information:
This work was financially supported by National Research Foundation of Korea (NRF) grant (NRF-2019R1A2C2010267) and Research fund of Korea University. We thank J.-W. Park, C.-H. Kang, and S.-H. Lee (Anam Hospital, Korea University) for X-ray image analysis and A. Nojeh (The University of British Columbia) for discussion of field emission properties.

Publisher Copyright:
© 2022 American Chemical Society.

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

General Materials Science
General Engineering
General Physics and Astronomy

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10.1021/acsnano.2c02233

Cite this

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title = "High-Performance Cold Cathode X-ray Tubes Using a Carbon Nanotube Field Electron Emitter",

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.",

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author = "Han, {Jun Soo} and Lee, {Sang Heon} and Hanbin Go and Kim, {Soo Jin} and Noh, {Jun Hong} and Lee, {Cheol Jin}",

note = "Funding Information: This work was financially supported by National Research Foundation of Korea (NRF) grant (NRF-2019R1A2C2010267) and Research fund of Korea University. We thank J.-W. Park, C.-H. Kang, and S.-H. Lee (Anam Hospital, Korea University) for X-ray image analysis and A. Nojeh (The University of British Columbia) for discussion of field emission properties. Publisher Copyright: {\textcopyright} 2022 American Chemical Society.",

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AU - Han, Jun Soo

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AU - Go, Hanbin

AU - Kim, Soo Jin

AU - Noh, Jun Hong

AU - Lee, Cheol Jin

N1 - Funding Information: This work was financially supported by National Research Foundation of Korea (NRF) grant (NRF-2019R1A2C2010267) and Research fund of Korea University. We thank J.-W. Park, C.-H. Kang, and S.-H. Lee (Anam Hospital, Korea University) for X-ray image analysis and A. Nojeh (The University of British Columbia) for discussion of field emission properties. Publisher Copyright: © 2022 American Chemical Society.

PY - 2022/7/26

Y1 - 2022/7/26

N2 - 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.

AB - 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.

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KW - emission current

KW - emission current density

KW - emission stability

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

Abstract

Bibliographical note

Keywords

ASJC Scopus subject areas

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