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Materials 2017, 10(8), 878; https://doi.org/10.3390/ma10080878

Direct Synthesis of Carbon Nanotube Field Emitters on Metal Substrate for Open-Type X-ray Source in Medical Imaging

1
Department of Physics, Kyung Hee University, Seoul 02453, Korea
2
CAT Beam Tech Co., Ltd., Seoul Biohub, 117-3, Hoegi-ro, Dongdaemun-gu, Seoul 02455, Korea
3
Department of Biomedical Engineering and Healthcare Industry Research Institute, Kyung Hee University, Seoul 02453, Korea
4
Department of Radiology, Asan Medical Center, University of Ulsan College of Medicine, Seoul 05505, Korea
*
Authors to whom correspondence should be addressed.
Received: 13 June 2017 / Revised: 3 July 2017 / Accepted: 27 July 2017 / Published: 29 July 2017
(This article belongs to the Special Issue Nanomaterials for Biomedical Applications)
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Abstract

We report the design, fabrication and characterization of a carbon nanotube enabled open-type X-ray system for medical imaging. We directly grew the carbon nanotubes used as electron emitter for electron gun on a non-polished raw metallic rectangular-rounded substrate with an area of 0.1377 cm2 through a plasma enhanced chemical vapor deposition system. The stable field emission properties with triode electrodes after electrical aging treatment showed an anode emission current of 0.63 mA at a gate field of 7.51 V/μm. The 4.5-inch cubic shape open type X-ray system was developed consisting of an X-ray aperture, a vacuum part, an anode high voltage part, and a field emission electron gun including three electrodes with focusing, gate and cathode electrodes. Using this system, we obtained high-resolution X-ray images accelerated at 42–70 kV voltage by digital switching control between emitter and ground electrode. View Full-Text
Keywords: carbon nanotube; open-type X-ray system; field emission carbon nanotube; open-type X-ray system; field emission
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).
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Gupta, A.P.; Park, S.; Yeo, S.J.; Jung, J.; Cho, C.; Paik, S.H.; Park, H.; Cho, Y.C.; Kim, S.H.; Shin, J.H.; Ahn, J.S.; Ryu, J. Direct Synthesis of Carbon Nanotube Field Emitters on Metal Substrate for Open-Type X-ray Source in Medical Imaging. Materials 2017, 10, 878.

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