Abstract
We fabricated vertically aligned carbon nanotube (CNT) point emitters directly on Cu wires with flat or sharp tips. The nanostructures and field emission properties of the two kinds of emitters were investigated. Both emitters showed vertically aligned, multi-walled bamboo-liked CNT structures and demonstrated good field emission properties. The emitter on the Cu wire with a flat tip (F-tip) attained an emission current of 70μA at 4200V whereas the emitter on the Cu wire with a sharp tip (S-tip) reached an emission current of 65μA at 3700V. Both of them demonstrated excellent field emission stability for 40h at emission currents of about 40μA and 10μA for the F-tip and S-tip emitters, respectively.
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