Author/Authors :
Tokura، نويسنده , , Yoshiko and Tsunawaki، نويسنده , , Yoshiaki and Ohigashi، نويسنده , , Nobuhisa and Akita، نويسنده , , Seiji and Nakayama، نويسنده , , Yoshikazu and Imasaki، نويسنده , , Kazuo and Mima، نويسنده , , Kunioki and Nakai، نويسنده , , Sadao، نويسنده ,
Abstract :
Field emission properties of entangled carbon nanotubes were studied for an electron beam source of Cherenkov or Smith–Purcell free electron laser. The cathode was made of carbon nanotubes which were mixed with a very small amount of resin and coated on/in a hollow metallic tube with outer diameter of 0.5 mm. The emission current was as high as 2.2 mA with a fluctuation of <4%. It seems that some entangled nanotubes were frayed under the high electric field and then electrons were emitted mainly from their tips. Reduction of the work function of the carbon nanotubes was observed with the degradation of vacuum pressure in the experimental apparatus.
Keywords :
Field emitter , Electron source , Carbon nanotube , Multi-walled nanotube , Field emission
