Field-emission properties and long-term stability of Tip-type carbon nanotubes coated with gallium-incorporated Zinc Oxide films

Title
Field-emission properties and long-term stability of Tip-type carbon nanotubes coated with gallium-incorporated Zinc Oxide films
Authors
김종필노영록조경철이상렬박진석
Keywords
Carbon nanotubes; ZnO and ZnO:Ga thin films; Pulsed laser deposition; Field emission property; Long-term stability; plasma-chemical vapor deposition
Issue Date
2009-12
Publisher
반도체및디스플레이장비학회지
Citation
VOL 8, NO 4, 65-69
Abstract
Carbon nanotubes (CNTs) were coated with undoped zinc oxide (ZnO) or 5 wt% gallium-incorporated ZnO (GZO) using various deposition conditions. The CNTs were directly grown on conical-type tungsten substrates at 700℃ using inductively coupled plasma-chemical vapor deposition. The pulsed laser deposition technique was used to deposit the ZnO and GZO thin films with very low stress. Field-emission scanning electron microscopy and high-resolution transmission electron microscopy were used to monitor the variations in the morphology and microstructure of CNTs prior to and after ZnO or GZO coating. The formation of ZnO and GZO films on CNTs was confirmed using energy-dispersive x-ray spectroscopy. In comparison to the as-grown (uncoated) CNT emitter, the CNT emitter that was coated with a thin (10 nm) GZO film showed remarkably improved field emission characteristics, such as the emission current of 325 μA at 1 kV and the threshold field of 1.96 V/μm at 0.1 μA, and it also exhibited the highly stable operation of emission current up to 40 h.
URI
http://pubs.kist.re.kr/handle/201004/37217
ISSN
1738-2270
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KIST Publication > Article
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