Abstract
The electron field emission characteristics of individual multiwalled carbon nanotubeswere investigated by a piezoelectric nanomanipulation system operating inside ascanning electron microscopy chamber. The experimental set-up ensures a preciseevaluation of the geometric parameters (multiwalled carbon nanotube lengthand diameter and anode–cathode separation) of the field emission system. Forseveral multiwalled carbon nanotubes, reproducible and quite stable emissioncurrent behaviour was obtained, with a dependence on the applied voltage welldescribed by a series resistance modified Fowler–Nordheim model. A turn-on field of∼30 V µm−1 and a field enhancement factor of around 100 at a cathode–anode distance of the order of1 µm were evaluated. Finally, the effect of selective electron beam irradiation on the nanotubefield emission capabilities was extensively investigated.
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