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(a) Scanning electron microscope image of the carbon nanorope and field emission anode. Protruding CNT are clearly visible from the CNR. The inset shows the anode and cathode experimental setup; (b) threshold field values for the carbon nanorope (엯) and etched iron tip (∎) as a function of anode–cathode gap.
(a) Threshold field plotted as a function of anode–cathode gap from the simulation data for both iron tip and seven randomly placed nanotubes. Inset is simulated iron tip and carbon nanorope with anode configuration; (b) threshold field plotted against anode to cathode separation for simulated nanotubes of height 2 (∎), 4 (엯), and (▵) with radius . Inset is simulated nanotube with anode configuration.
Variation of enhancement factor for a nanotube of (∎), (◻), (●), (엯), and (▴), (▵) each with radius . Closed symbols are associated with and open symbols with .
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