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Improvement of field emission characteristics of carbon nanotubes by enhancing physical and electrical contacts

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5 Author(s)
Hansung Lee ; Fac. of Nanotechnol. & Adv. Mater. Eng., Sejong Univ., Seoul, South Korea ; Sora Sim ; Taeyang Kim ; Jeungchoon Goak
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We developed a novel process to fabricate 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 electrical resistance and 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.

Published in:

Vacuum Nanoelectronics Conference (IVNC), 2012 25th International

Date of Conference:

9-13 July 2012