Korean Journal of Metals and Materials (대한금속재료학회지)

The Korean Institute of Metals and Materials (대한금속재료학회)
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Purification of Single-walled Carbon Nanotubes by HCl Treatment and Analysis of the Field Emission Property

염산에 의한 단중벽 탄소나노튜브 정제와 전자방출 특성 평가

  • Lyu, SeungChul (Department of Nanotechnology, University of Seoul) ;
  • Jung, Dami (Department of Nano Science & Technology, University of Seoul) ;
  • Ahn, KiTae (Department of Nano Science & Technology, University of Seoul) ;
  • Lee, Hansung (Faculty of Nanotechnology and Advanced Materials Engineering, Sejong University) ;
  • Lee, Naesung (Faculty of Nanotechnology and Advanced Materials Engineering, Sejong University) ;
  • Park, Yunsun (Department of Industrial and Management Engineering, Myongi University) ;
  • Sok, Junghyun (Department of Nanotechnology,Department of Nano Science & Technology, University of Seoul)
  • 류승철 (서울시립대학교 나노공학과) ;
  • 정다미 (서울시립대학교 나노과학기술학과) ;
  • 안기태 (서울시립대학교 나노과학기술학과) ;
  • 이한성 (세종대학교 나노신소재공학부) ;
  • 이내성 (세종대학교 나노신소재공학부) ;
  • 박윤선 (명지대학교 산업경영공학과) ;
  • 석중현 (서울시립대학교 나노공학과,나노과학기술학과)
  • Received : 2009.10.29
  • Published : 2010.04.15
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Abstract

High-quality single-walled carbon nanotubes (SWCNTs) were synthesized by catalytic decomposition of $C_2H_2$ using Fe-Mo/MgO catalyst at $800^{\circ}C$. The as-synthesized SWCNTs typically occurred in the form of a bundle with a diameter of 10~20 nm together with amorphous carbon and catalytic impurities, which were removed by a two-step purification process consisting of oxidation and an acid treatment. The oxidation step, using an $O_2$-Ar mixture at $380^{\circ}C$ for 5 hr in a vertical-type furnace and a $HNO_3$ treatment at $100^{\circ}C$ for one hour, was utilized to remove the amorphous carbon particles. Subsequently, metallic catalysts were removed in HCl at room temperature for 5 hr under magnetic stirring. The SWCNT suspension was prepared by dispersing the purified SWCNTs in an aqueous sodium dodecyl benzene sulfonate solution with horn-type sonication. This was then air-sprayed on glass to fabricate CNT field emitters. The samples had a turn-on field value of 4 V/${\mu}m$ and a current density of 0.67 mA/$cm^2$ at 9 V/${\mu}m$. Increasing the HCl treatment time improved the field emission properties.

Keywords

Acknowledgement

Supported by : 서울시

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