Korean Journal of Materials Research (한국재료학회지)

Materials Research Society of Korea (한국재료학회)
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NO Gas Sensing Properties of ZnO-Carbon Nanotube Composites

산화아연-탄소나노튜브 복합체의 일산화질소 가스 감지 특성

  • Park, Seong-Yong (School of Nano Science and Technology, Chungnam National University) ;
  • Jung, Hoon-Chul (School of Nano Science and Technology, Chungnam National University) ;
  • Ahn, Eun-Seong (School of Nano Science and Technology, Chungnam National University) ;
  • Nguyen, Le Hung (School of Nano Science and Technology, Chungnam National University) ;
  • Kang, Youn-Jin (School of Nano Science and Technology, Chungnam National University) ;
  • Kim, Hyo-Jin (School of Nano Science and Technology, Chungnam National University) ;
  • Kim, Do-Jin (School of Nano Science and Technology, Chungnam National University)
  • 박성용 (충남대학교 공과대학 나노공학부) ;
  • 정훈철 (충남대학교 공과대학 나노공학부) ;
  • 안은성 (충남대학교 공과대학 나노공학부) ;
  • 웬래훙 (충남대학교 공과대학 나노공학부) ;
  • 강영진 (충남대학교 공과대학 나노공학부) ;
  • 김효진 (충남대학교 공과대학 나노공학부) ;
  • 김도진 (충남대학교 공과대학 나노공학부)
  • Published : 2008.12.27
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Abstract

The NO gas sensing properties of ZnO-carbon nanotube (ZnO-CNT) composites fabricated by the coaxial coating of single-walled CNTs with ZnO were investigated using pulsed laser deposition. Upon examination, the morphology and crystallinity of the ZnO-CNT composites showed that CNTs were uniformly coated with polycrystalline ZnO with a grain size as small as 5-10 nm. Gas sensing measurements clearly indicated a remarkable enhancement of the sensitivity of ZnO-CNT composites for NO gas compared to that of ZnO films while maintaining the strong sensing stability of the composites, properties that CNT-based sensing materials do not have. The enhanced gas sensing properties of the ZnO-CNT composites are attributed to an increase in the surface adsorption area of the ZnO layer via the coating by CNTs of a high surface-to-volume ratio structure. These results suggest that the ZnO-CNT composite is a promising template for novel solid-state semiconducting gas sensors.

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References

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