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Carbon Nanotubes

Currently, electron beams are produced by heating a filament to the point where electrons have enough energy to overcome the work function. In field emission, the potential barrier is lowered by the strength of the applied field only.

Because this requires very high fields, current research focuses on exploiting the local increase in field strength which occurs around a sharp tip. The field enhancement factor, measures the degree to which this occurs and is related to the aspect ratio of the tip.

Download PDF of full article here – Carbon Nanotubes