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The cold cathode x-ray source was fabricated by using the point-type CNT film emitter. The CNT x-ray source consists of the CNT point emitter, the metal mesh gate electrode and the tungsten target anode electrode. Those components were mounted in a small vacuum chamber. The fabricated CNT x-ray source shows a high resolution x-ray image at a low anode current and at a low anode voltage compared to...
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...
We demonstrated carbon nanotube (CNT) field emitters made by a filtration-transfer method. They showed low turn-on and threshold electric fields, which is attributed to the advantages of this method, such as the high density of emission sites, good electrical contact, strong mechanical adhesion, and low contamination of CNTs tips. In addition, the field emitters showed very stable emission stability...
The authors report on further improvement of carbon nanotube pillar array (CPA) cathodes for achieving higher current densities. A novel geometry of patterned carbon nanotube (CNT) emitter pillar array with increased edge area, was presented. This new geometry differs from the CNT pillar in that it has an open-center, similar to the structure of a toroid. The toroid CNT pillar with an inner radius...
Carbon nanotubes (CNT) are grown in anodic aluminum oxide (AAO) and use as field emitters in a triode structure. To fabricate the field-emission triode structure, nanoporous AAO thin layer is first prepared on the Si(100) substrate, followed by the growth of vertically aligned carbon nanotubes in AAO pore channels by electron cyclotron resonance chemical vapor deposition. The SiO2 dielectric and Al...
A Bayard-Alpert ionization gauge with a carbon nanotube (CNT) field emitter was fabricated and tested. CNTs were grown on stainless steel rods by thermal chemical vapor deposition at 900degC in a mixture of CH4 an H2 gas. The structure of the as-grown CNTs was investigated using scanning electron microscopy, transmission electron microscopy and Raman spectroscopy. The longtime field emission stability,...
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