Author/Authors :
Hansung Lee، نويسنده , , Jeungchoon Goak، نويسنده , , Jusung Choi، نويسنده , , Byoungyun Kong، نويسنده , , Choong Hun Lee، نويسنده , , Ki Buem Kim، نويسنده , , Jun-Young Park، نويسنده , , Yongho Seo، نويسنده , , Young Chul Choi، نويسنده , , Yoon-Ho Song، نويسنده , , Naesung Lee، نويسنده ,
Abstract :
The fabrication and field emission characteristics are reported for point-type carbon nanotube (CNT) emitters formed by transferring a CNT film onto a Ni-coated Cu wire with a diameter of 1.24 mm. A Ni layer plays a role in enhancing the adhesion of CNTs to the substrate and improving their field emission characteristics. On firing at 400 °C, CNTs appear to directly bonded to a Ni layer. With a Ni layer introduced, a turn-on electric field of CNT emitters decreases from 1.73 to 0.81 V/μm by firing. The CNT film on the Ni-coated wire produces a high emission current density of 667 mA/cm2 at quite a low electric field of 2.87 V/μm. This CNT film shows no degradation of emission current over 40 h for a current density of 60 mA/cm2 at electric field of 6.7 V/μm. X-ray imaging of a printed circuit board with fine features is demonstrated by using our point-type CNT emitters.
