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Open AccessArticle

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

Department of Physics, Kyung Hee University, Seoul 02453, Korea
CAT Beam Tech Co., Ltd., Seoul Biohub, 117-3, Hoegi-ro, Dongdaemun-gu, Seoul 02455, Korea
Department of Biomedical Engineering and Healthcare Industry Research Institute, Kyung Hee University, Seoul 02453, Korea
Department of Radiology, Asan Medical Center, University of Ulsan College of Medicine, Seoul 05505, Korea
Authors to whom correspondence should be addressed.
Materials 2017, 10(8), 878;
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)
PDF [3409 KB, uploaded 31 July 2017]


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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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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