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Materials (Basel). 2017 Jul 29;10(8). pii: E878. doi: 10.3390/ma10080878.

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

Author information

1
Department of Physics, Kyung Hee University, Seoul 02453, Korea. amargupta@khu.ac.kr.
2
CAT Beam Tech Co., Ltd., Seoul Biohub, 117-3, Hoegi-ro, Dongdaemun-gu, Seoul 02455, Korea. amargupta@khu.ac.kr.
3
Department of Physics, Kyung Hee University, Seoul 02453, Korea. sjpark1112@khu.ac.kr.
4
Department of Physics, Kyung Hee University, Seoul 02453, Korea. sjyeo@khu.ac.kr.
5
CAT Beam Tech Co., Ltd., Seoul Biohub, 117-3, Hoegi-ro, Dongdaemun-gu, Seoul 02455, Korea. sjyeo@khu.ac.kr.
6
CAT Beam Tech Co., Ltd., Seoul Biohub, 117-3, Hoegi-ro, Dongdaemun-gu, Seoul 02455, Korea. jijung@catbeamtech.com.
7
CAT Beam Tech Co., Ltd., Seoul Biohub, 117-3, Hoegi-ro, Dongdaemun-gu, Seoul 02455, Korea. cgcho@catbeamtech.com.
8
CAT Beam Tech Co., Ltd., Seoul Biohub, 117-3, Hoegi-ro, Dongdaemun-gu, Seoul 02455, Korea. radpsh@gmail.com.
9
Department of Biomedical Engineering and Healthcare Industry Research Institute, Kyung Hee University, Seoul 02453, Korea. sigmoidus@khu.ac.kr.
10
Department of Radiology, Asan Medical Center, University of Ulsan College of Medicine, Seoul 05505, Korea. cjsakura@naver.com.
11
Department of Radiology, Asan Medical Center, University of Ulsan College of Medicine, Seoul 05505, Korea. kimsh6713@gmail.com.
12
Department of Radiology, Asan Medical Center, University of Ulsan College of Medicine, Seoul 05505, Korea. jhshin@amc.seoul.kr.
13
Department of Physics, Kyung Hee University, Seoul 02453, Korea. johnsonahn@khu.ac.kr.
14
Department of Physics, Kyung Hee University, Seoul 02453, Korea. jhryu@khu.ac.kr.
15
CAT Beam Tech Co., Ltd., Seoul Biohub, 117-3, Hoegi-ro, Dongdaemun-gu, Seoul 02455, Korea. jhryu@khu.ac.kr.

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.

KEYWORDS:

carbon nanotube; field emission; open-type X-ray system

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