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Keywords:

  • carbon nanotubes;
  • field emission;
  • coaxial gates;
  • ballast resistor;
  • cathodes
Thumbnail image of graphical abstract

A low density vertically aligned carbon nanotube-based field-emission cathode with a ballast resistor and coaxial gate is designed and fabricated. The ballast resistor can overcome the non-uniformity of the local field-enhancement factor at the emitter apex. The self-aligned fabrication process of the coaxial gate can avoid the effects of emitter tip misalignment and height non-uniformity.