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Journal Article
Preparation of a Miniature Carbon Nanotube Paste Emitter for Very High Resolution X-ray Imaging
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- Authors
- Young Chul Choi, Jun-Tae Kang, Sora Park, Min-Sik Shin, Hyojin Jeon, Jae-Woo Kim, Jin-Woo Jeong, Yoon-Ho Song
- Issue Date
- 2016-04
- Citation
- Carbon, v.100, pp.302-308
- ISSN
- 0008-6223
- Publisher
- Elsevier
- Language
- English
- Type
- Journal Article
- Abstract
- A miniature carbon nanotube (CNT) paste emitter dot with a diameter of ~50 μm was fabricated onto the cross-sectional surface of Kovar (nickel-cobalt ferrous alloy) rod without using a sophisticated photolithography. A highly adhesive CNT paste was prepared with silicon carbide and nickel nanoparticles, and then the small CNT emitter was fabricated by a novel and facile technique, called point contact method. The prepared emitter generates very high current density of ~11.2 A/cm2 when measured using a diode configuration. We further observed for the first time the brightness of electron beam generated from the CNT paste emitter that is a more practical point electron source than the individual CNT emitter. The triode structure fabricated with a miniature CNT paste emitter and a gate aperture (20 μm in diameter) generated a collimated electron beam by which very high resolution (>16 lp/mm) X-ray imaging was achieved.
- KSP Keywords
- CNT paste, Carbon nano-tube(CNT), Cross-sectional, Electron Beam, Ferrous alloy, Nickel-cobalt, Point electron source, Triode structure, Very high resolution, X-ray imaging, carbon nanotube paste