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

28 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

Access to Document

10.1021/acsnano.2c02233

Cite this

@article{ef5de126dcf845098cae8adad10f49b4,

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.",

keywords = "carbon nanotube, cold cathode X-ray tube, emission current, emission current density, emission stability, field electron emitter, focal spot size",

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.",

year = "2022",

month = jul,

day = "26",

doi = "10.1021/acsnano.2c02233",

language = "English",

volume = "16",

pages = "10231--10241",

journal = "ACS nano",

issn = "1936-0851",

publisher = "American Chemical Society",

number = "7",

}

TY - JOUR

T1 - High-Performance Cold Cathode X-ray Tubes Using a Carbon Nanotube Field Electron Emitter

AU - Han, Jun Soo

AU - Lee, Sang Heon

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.

KW - carbon nanotube

KW - cold cathode X-ray tube

KW - emission current

KW - emission current density

KW - emission stability

KW - field electron emitter

KW - focal spot size

UR - http://www.scopus.com/inward/record.url?scp=85135807289&partnerID=8YFLogxK

U2 - 10.1021/acsnano.2c02233

DO - 10.1021/acsnano.2c02233

M3 - Article

C2 - 35687140

AN - SCOPUS:85135807289

SN - 1936-0851

VL - 16

SP - 10231

EP - 10241

JO - ACS nano

JF - ACS nano

IS - 7

ER -

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

Abstract

Bibliographical note

Keywords

ASJC Scopus subject areas

Access to Document

Other files and links

Fingerprint

Cite this