Journal
CARBON
Volume 100, Issue -, Pages 302-308Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.carbon.2016.01.026
Keywords
Carbon nanotube; Miniature paste emitter; Brightness; High resolution; X-ray imaging
Funding
- Ministry of Science, ICT, and Future Planning, Korea through the R&D program of ISTK [B551179-12-04-00]
- ETRI RD program [15ZE1140]
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A miniature carbon nanotube (CNT) paste emitter dot with a diameter of similar to 50 mu m 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 similar to 11.2 A/cm(2) 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 mm in diameter) generated a collimated electron beam by which very high resolution (> 16 lp/mm) X-ray imaging was achieved. (C) 2016 Elsevier Ltd. All rights reserved.
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