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Nanomaterials 2018, 8(6), 378; https://doi.org/10.3390/nano8060378

Carbon Nanotube Field Emitters Synthesized on Metal Alloy Substrate by PECVD for Customized Compact Field Emission Devices to Be Used in X-Ray Source Applications

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 Radiology, Vinmec International Hospital, Ha Noi 10000, Vietnam
4
Department of Information Display, Kyung Hee University, Seoul 02453, Korea
5
Department of Radiology, Asan Medical Center, University of Ulsan College of Medicine, Seoul 05505, Korea
These authors contributed equally to this work.
*
Authors to whom correspondence should be addressed.
Received: 18 April 2018 / Revised: 21 May 2018 / Accepted: 24 May 2018 / Published: 29 May 2018
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Abstract

In this study, a simple, efficient, and economical process is reported for the direct synthesis of carbon nanotube (CNT) field emitters on metal alloy. Given that CNT field emitters can be customized with ease for compact and cold field emission devices, they are promising replacements for thermionic emitters in widely accessible X-ray source electron guns. High performance CNT emitter samples were prepared in optimized plasma conditions through the plasma-enhanced chemical vapor deposition (PECVD) process and subsequently characterized by using a scanning electron microscope, tunneling electron microscope, and Raman spectroscopy. For the cathode current, field emission (FE) characteristics with respective turn on (1 μA/cm2) and threshold (1 mA/cm2) field of 2.84 and 4.05 V/μm were obtained. For a field of 5.24 V/μm, maximum current density of 7 mA/cm2 was achieved and a field enhancement factor β of 2838 was calculated. In addition, the CNT emitters sustained a current density of 6.7 mA/cm2 for 420 min under a field of 5.2 V/μm, confirming good operational stability. Finally, an X-ray generated image of an integrated circuit was taken using the compact field emission device developed herein. View Full-Text
Keywords: carbon nanotubes; PECVD; metal alloy; field emission; compact field emission device; X-ray source carbon nanotubes; PECVD; metal alloy; field emission; compact field emission device; X-ray source
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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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Park, S.; Gupta, A.P.; Yeo, S.J.; Jung, J.; Paik, S.H.; Mativenga, M.; Kim, S.H.; Shin, J.H.; Ahn, J.S.; Ryu, J. Carbon Nanotube Field Emitters Synthesized on Metal Alloy Substrate by PECVD for Customized Compact Field Emission Devices to Be Used in X-Ray Source Applications. Nanomaterials 2018, 8, 378.

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