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Field emission properties of carbon nanotubes directly grown on a well-polished oxygen-free copper substrate by chemical-vapor deposition (CVD) were studied. Ni was sputtered on the copper substrate as catalyst, and the reactant gas was acetylene. From scanning electron microscopic and transmission electron microscopic images, the as-grown carbon nanotubes are seen to be bamboo structure with branches...
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...
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