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A CNT field emitter is suitable to keep the nano-sized focal spot of electron beam for the high-quality images by an x-ray source in nano inspection systems. The micro-sized CNT emitter of an around 10 µm in diameter was formed by the optimized CNT paste through the simple ball-milling process, showing a high current density of 124 A/cm2 at an anode voltage of 4.95 kV. We designed the focal spot of...
We have successfully developed the vacuum-sealed carbon nano-tube (CNT) x-ray tube. The remarkable improvement of field emission properties, life time and stability, was obtained after high temperature brazing process in a vacuum circumstance.
We have developed highly adhesive carbon nanotube field emitters with a carbide filler. The adhesion was reinforced by a chemical reaction between the carbide filler and the substrate. We observed the field emission properties to be improved by the increment of the effective field emitters through repeated surface treatments.
We have successfully fabricated the reliable vacuum-sealed X-ray tube with carbon nanotube (CNT) emitters through a specially designed brazing process. The robust CNT emitters were also adopted for high-temperature endurance during the brazing process. The stable field emission current from the sealed X-ray tube indicated a good maintenance of vacuum level needed for the CNT field emitters. The stability...
We suggest a novel gate structure, Focusing-Functional Gate (FFG), having a focusing effect on the electron beams from the carbon nanotube (CNT) emitters for the miniature X-ray tubes. The FFG induced field emission from the CNT emitters and focused electron beams into the anode target without an additional focusing electrode, resulting in a small focal spot with little charging at the insulating...
We, for the first time, developed fully vacuum-sealed X-ray tubes with carbon nanotube field emitters. The specially designed brazing process has been adopted for the vacuum sealing of the X-ray tube. The fabricated two types of X-ray tubes showed a good operation with a high stability and long lifetime.
We have designed and fabricated a highperformance carbon nanotube (CNT) field emitter for a vacuum-sealed X-ray tube by a brazing process. The developed high-temperature endurable CNT emitters were vacuum-sealed in the diode and triode configurations, showing little degradation upon the brazing process and a good cold cathode of X-ray tube.
We have successfully operated the vacuum-sealed pentode X-ray tube with carbon nanotube (CNT) field emitters. Each component of the X-ray tube was sealed by a two-step brazing process in a vacuum furnace. The robust CNT emitter was specially developed for high-temperature endurance during the vacuum brazing process.
We have fabricated a smart triode X-ray tube based on carbon nanotube (CNT) emitters with a high tube current for the stationary breast tomosynthesis examination system. The X-ray tube was designed to have a focal spot of around 0.3 mm. The active-current driving method was applied to our X-ray device to enhance stability and uniformity of the CNT emitters. We have obtained successful X-ray images...
The CNT emitter on metal tip (CNT-on-Tip) cathode can provide high-brightness electron beams due to its point-like electron emission sites. The triode type emitter with a gate electrode is prerequisite to an intensity-controllable X-ray. We simulated the trajectory of the emitted electron beams in the triode CNT-on-Tip and optimized the configuration to obtain ideal triode properties. Consequently,...
We have fabricated a high-temperature endurable carbon nanotube (CNT) emitter for a cold cathode X-ray tube. The ball-milling was used in the CNT paste procedure for effective material dispersion. After a high-temperature annealing process for vacuum sealing, a negligible change was observed in the surface morphology of CNT emitters. The developed CNT emitter maintained outstanding field emission...
Polylactide (PLA)/bamboo fiber biocomposites treated with an alkali solution and a silane coupling agent were prepared by melt compounding. The PLA composite containing delignified bamboo fibers showed a narrow decomposition range of 300–400 °C compared to the PLA composite containing pristine bamboo fiber (210–430 °C). The tensile and flexural moduli of the treated PLA/bamboo fiber composite increased...
In this study, we have developed a CNT paste for high-current density field emitters by using a ball-milling process. The ball-milling was used in the CNT paste procedure for effective material dispersion. Material dispersion is one of the most important factors in a paste synthetic process. The ball-milling is a very easy and simple method to produce a printable CNT paste. The CNT paste was made...
Field emission micro-focus X-ray source based on carbon nanotube (CNT) has attractive features for biomedical or clinical imaging. X-ray sources for micro-focus and/or miniature tube types require a mini-sized, high-density emission current in the order of 102~103 mA/cm2. We have previously reported that the optimized paste composition with a nano-scale metal filler enhanced adhesion between CNT emitter...
In recent, field emission lamp (FEL) with carbon nanotube (CNT) field emitters was intensively studied for a high performance back light unit (BLU) in LCD. The CNT-FEL can give a local dimming BLU increasing contrast ratio, reducing motion blur and saving power consumption. The local FE blocks, in general, are arranged in a matrix format and addressed by voltage pulse signals. In this method the row...
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