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Field emitters of vertical carbon fibers on a silicon substrate are fabricated by catalytic chemical vapor deposition. After an ageing process of 150min, field emission measurement of the fibers is carried out in a vacuum chamber with a base pressure of 5.0×10 −4 Pa. The experimental results display that field emission performance of the carbon fibers depends strongly on the vacuum level during...
Carbon nanotubes have been grown on a polished copper substrate by thermal chemical vapor deposition (CVD). Nickel film is deposited on the metallic substrate as catalyst and the reactant gas is acetylene. Efficient field emission of CNTs emitters (Emission area is about 3.14 mm2) is observed from I-V and F-N curves. Stable emission current with the density of more than 20mA was got at the electric...
In this paper, the effects of catalyst film thickness on the field emission currents and the emission stability of carbon nanotubes (CNTs) are presented. The CNTs are grown on Ni catalyst films of different thickness (20 nm, 50 nm, 70 nm) by chemical vapor deposition (CVD). Results show that the CNTs grown on 20 nm catalyst films have a poorer field emission and poorer emission stability than those...
This paper reports the development and the operation of field emitters with low turn on electric field based on carbon fibres. Field emitters of vertical carbon fibres on silicon substrate were fabricated by the catalyst chemical vapor deposition. The diameter of the fibres is about 3~4 mum and the height is larger than 1 mm. After one aging process of 150 minutes, field emission measurements of carbon...
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