Journal of the Semiconductor & Display Technology (반도체디스플레이기술학회지)

The Korean Society Of Semiconductor & Display Technology (한국반도체디스플레이기술학회)
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Field-emission Properties and Long-term Stability of Tip-type Carbon Nanotubes Coated with Gallium-incorporated Zinc Oxide Films

갈륨이 첨가된 산화아연막의 코팅에 따른 미세팁 구조 탄소나노튜브의 전계방출 특성 및 장시간 안정성

  • Kim, Jong-Pil (Dept. of Electronic, Electrical, Control and Instrumentation Engineering, Hanyang University,) ;
  • Noh, Young-Rok (Dept. of Electronic, Electrical, Control and Instrumentation Engineering, Hanyang University,) ;
  • Jo, Kyoung-Chul (Center for Energy Materials, Korea Institute of Science and Technology) ;
  • Lee, Sang-Yeol (Center for Energy Materials, Korea Institute of Science and Technology) ;
  • Park, Jin-Seok (Dept. of Electronic, Electrical, Control and Instrumentation Engineering, Hanyang University,)
  • 김종필 (한양대학교 전자전기제어계측공학과) ;
  • 노영록 (한양대학교 전자전기제어계측공학과) ;
  • 조경철 (한국과학기술연구원 에너지재료센터) ;
  • 이상렬 (한국과학기술연구원 에너지재료센터) ;
  • 박진석 (한양대학교 전자전기제어계측공학과)
  • Published : 2009.12.31
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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 $700^{\circ}C$ 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 $325\;{\mu}A$ at 1 kV and the threshold field of $1.96\;V/{\mu}m$ at $0.1\;{\mu}A$, and it also exhibited the highly stable operation of emission current up to 40 h.

Keywords

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