A simple method to make field emitter using ropes of single-walled carbon nanotubes

Field emission characteristics of single-walled carbon nanotubes were studi ed by using a simple method in a field emission microscope. The nanotube em ission gun works effectively at the room temperature under a threshold fiel d as low as 3.9 mV/mu m. A typical I-V relationship of field emission was o btained with a high current density The observed stable bright spots on the fluorescent screen originate from an ensemble emission from micro-ropes of the single-wailed carbon nanotubes.