한국진공학회지 (Journal of the Korean Vacuum Society)

한국진공학회 (The Korean Vacuum Society)
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이중벽 탄소나노튜브의 염산처리 시간에 따른 전계방출 특성 평가

Field Emission Characteristics of Double-walled Carbon Nanotubes Related with Hydrochloric Acid Treatment

  • 정다미 (서울시립대학교 나노과학기술학과) ;
  • 석중현 (서울시립대학교 나노과학기술학과)
  • Jung, Da-Mi (Department of Nano science & technology, University of Seoul) ;
  • Sok, Jung-Hyun (Department of Nano science & technology, University of Seoul)
  • 투고 : 2010.11.05
  • 심사 : 2010.01.12
  • 발행 : 2011.01.30
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초록

전자 방출원 및 디스플레이 응용분야에서 우수한 가능성을 보이고 있는 이중벽 탄소나노튜브를 Tetrahydrofuran (THF) 열분해 방법으로 대량 합성하였다. 합성된 이중벽 탄소나노튜브는 불순물로 비정질 탄소와 금속촉매를 포함하고 있어, 이를 제거하기 위해 열처리와 과산화수소, 질산, 염산을 이용한 산 처리를 하였다. 정제된 이중벽 탄소나노튜브를 계면 활성제인 Sodium dodecylbenzenesulfonate (SDBS)를 사용하여 잉크를 제작하였고, 잉크를 스프레이 방법으로 Indium Tin Oxide (ITO)기판에 분무하여 전계방출을 위한 에미터를 제작하였다. 본 연구에서는 염산 처리 시간에 따른 이중벽 탄소나노튜브의 특성을 X-ray diffraction, Thermal Gravity Analysis (TGA) 측정을 통해 평가하였고, 염산 처리 시간이 증가할수록 전계방출 특성이 향상되는 것을 FE-current 측정으로 확인하였다.

High-quality double-walled carbon nanotubes (DWCNTs) were synthesized by catalytic decomposition method at $800^{\circ}C$ using Tetrahydrofuran. The as-synthesized DWCNTs typically have catalytic impurities and amorphous carbon, which were removed by two-step purification process, consisting of thermal oxidation and H2O2, HNO3, HCl treatment. The DWCNT suspension was prepared by dispersing the purified DWCNTs in an aqueous sodium dodecylbenzenesulfonate solution with horn-type sonication. This was then sprayed on ITO glass to fabricate CNT field emitters. The quality of purified DWCNTs was estimated with X-ray diffraction and Thermal Gravity Analysis. The field emission properties were improved by increasing the process time of HCl treatment.

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