Procedure of mounting a carbon nanotube electron source within a scanning electron microscope. (a) A carbon nanotube protruding from a thin substrate containing many carbon nanotubes is selected and (b) is attached to a tungsten support tip. (c) The carbon nanotube is broken by Joule heating. (d) The open tube end is closed by drawing current of .
Fowler-Nordheim plot for carbon nanotube, with fitted quadratic curve.
Potential distribution calculated from (1) with , , and (, ).
as function of , for .
as function of .
Supply factor as function of with as parameter. The short curves show how and change as is varied over the experimental range while remains constant.
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