Korean Journal of Materials Research (한국재료학회지)

Materials Research Society of Korea (한국재료학회)
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NO Gas Sensing Characteristics of Layered Composites of Carbon Nanotubes Coated with Al-Doped ZnO

탄소나노튜브를 알루미늄이 첨가된 산화아연으로 코팅한 층상 복합체의 일산화질소 가스 감지 특성

  • Ahn, Eun-Seong (Department of Materials Science and Engineering, Chungnam National University) ;
  • Jung, Hoon-Chul (Department of Materials Science and Engineering, Chungnam National University) ;
  • Nguyen, Nguyen Le (Department of Materials Science and Engineering, Chungnam National University) ;
  • Oh, Dong-Hoon (Department of Materials Science and Engineering, Chungnam National University) ;
  • Kim, Hyo-Jin (Department of Materials Science and Engineering, Chungnam National University) ;
  • Kim, Do-Jin (Department of Materials Science and Engineering, Chungnam National University)
  • 안은성 (충남대학교 공과대학 재료공학과) ;
  • 정훈철 (충남대학교 공과대학 재료공학과) ;
  • 웬래홍 (충남대학교 공과대학 재료공학과) ;
  • 오동훈 (충남대학교 공과대학 재료공학과) ;
  • 김효진 (충남대학교 공과대학 재료공학과) ;
  • 김도진 (충남대학교 공과대학 재료공학과)
  • Published : 2009.11.27
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Abstract

We investigated the NO gas sensing characteristics of ZnO-carbon nanotube (ZnO-CNT) layered composites fabricated by coaxial coating of single-walled CNTs with a thin layer of 1 wt% Al-doped ZnO using rf magnetron sputtering deposition. Morphological studies clearly revealed that the ZnO appeared to form beadshaped crystalline nanoparticles with an average diameter as small as 30 nm, attaching to the surface of the nanotubes. It was found that the NO gas sensing properties of the ZnO-CNT layered composites were dramatically improved over Al-doped ZnO thin films. It is reasoned from these observations that an increase in the surface-to-volume ratio associated with the numerous ZnO “nanobeads” on the surface of the CNTs results in the enhancement of the NO gas sensing properties. The ZnO-CNT layered composite sensors exhibited a maximum sensitivity of 13.7 to 2 ppm NO gas at a temperature of 200${^{\circ}C}$ and a low NO gas detection limit of 0.2 ppm in dry air.

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