Field-emission properties and long-term stability of Tip-type carbon nanotubes coated with gallium-incorporated Zinc Oxide films
- Field-emission properties and long-term stability of Tip-type carbon nanotubes coated with gallium-incorporated Zinc Oxide films
- 김종필; 노영록; 조경철; 이상렬; 박진석
- Carbon nanotubes; ZnO and ZnO:Ga thin films; Pulsed laser deposition; Field emission property; Long-term stability; plasma-chemical vapor deposition
- Issue Date
- VOL 8, NO 4, 65-69
- 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.
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