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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...
At present carbon nanotubes (CNT) are the most prospective cathode material for triode applications because of their strong field emission (FE) at low electric fields. The FE homogeneity of flat CNT cathodes, however, is still limited by their rather fast and uncontrolled growth which usually leads to strongly varying field enhancement and current carrying capability of the individual emitters. Therefore,...
The authors demonstrated decoration of Ru nanoparticles on the surface of double-walled CNTs (DWCNTs) using a chemical process and studied their field emission properties. Ru is more stable than the low work function alkali metals when exposed to oxygen. Moreover, the melting point of Ru is much higher than that of RuO2.
We introduce a novel geometry carbon nanotube field emitter array capable of achieving high current densities. Arrays of patterned vertically aligned CNT bundles, with an open center similar to the structure of a donut, was grown directly on bulk metallic substrates. This new carbon nanotube structure, with larger edge area for enhanced edge effect, reached current densities as high as 60 mA/cm2 at...
Using Monte Carlo simulation technique, we have calculated the distribution of ion current extracted from low-temperature plasmas and deposited onto the substrate covered with a nanotube array. We have shown that a free-standing carbon nanotube is enclosed in a circular bead of the ion current, whereas in square and hexagonal nanotube patterns, the ion current is mainly concentrated along the lines...
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