Title :
Field Emission and Lifetime Characteristics of Titanium-coated Carbon Nanotubes
Author :
Moon, Heesung ; Kim, Jaemyung ; Kim, Changwook ; Cho, Youngmi ; Cho, Sunghee ; Park, Jonghwan ; Zang, Dongsik
Author_Institution :
Display R&D Center, Samsung SDI Co. Ltd., Yongin
Abstract :
We investigated the effect of titanium (Ti)-coated carbon nanotubes (CNTs) theoretically and experimentally. We found that adsorption of single Ti atom lowers the work function of CNTs by density functional calculations. Also, Ti-coated CNTs showed the largest increase in local density of states around Fermi level under electric fields. Coating of Ti metal on CNTs was carried out by electroless plating method. Ti-coated CNTs were mixed with conductive pastes, and then screen-printed. The measurement of field emission carried out using a diode structure showed that the electron emission of Ti-coated CNT films uniformly had a field of 3.7 V/mum at a current density of 100 mu/cm2 (1/500 duty), as compare to bare CNT films showed a field of 5.5 V/mum. Furthermore, the lifetime of our CNT samples was about a few times as much as that of the pristine ones. Therefore, Ti-coated CNTs improved the characteristics of CNT-based field emission emitters
Keywords :
adsorption; carbon nanotubes; current density; density functional theory; electroless deposited coatings; electron field emission; electronic density of states; thick films; titanium; work function; C; CNT; Fermi level; Ti; adsorption; coatings; conductive pastes; current density; density functional calculations; diode structure; electroless plating; electron field emission; field emitters; lifetime; local density of states; screen printing; titanium coated carbon nanotubes; work function; Carbon nanotubes; Coatings; Current density; Current measurement; Density measurement; Diodes; Flat panel displays; Powders; Titanium; Vehicles;
Conference_Titel :
Vacuum Nanoelectronics Conference, 2006 and the 2006 50th International Field Emission Symposium., IVNC/IFES 2006. Technical Digest. 19th International
Conference_Location :
Guilin
Print_ISBN :
1-4244-0401-0
DOI :
10.1109/IVNC.2006.335223
