Journal of the Korean institute of surface engineering (한국표면공학회지)

The Korean Institute of Surface Engineering (한국표면공학회)
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The Effect of Wall Thickness of ZnO Nanotubes on the Ethanol Gas Sensing Performance

산화아연 나노튜브의 벽 두께에 따른 에탄올 가스 검출특성

  • Kang, Wooseung (Department of Metallurgical & Materials Engineering, Inha Technical College)
  • 강우승 (인하공업전문대학 금속재료과)
  • Received : 2017.06.16
  • Accepted : 2017.06.22
  • Published : 2017.06.30
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Abstract

ZnO nanotubes were synthesized to investigate the effect of wall thickness on the ethanol gas sensing performance. The wall thickness of the nanotubes was varied from approximately 20 to 60 nm. Transmission electron microscopy, X-ray diffraction and SAED (Selected Area Electron Beam Diffraction) analyses showed that the synthesized nanotubes were polycrystalline structured ZnO with the diameter of approximately 200-300nm. The ZnO nanotubes sensor with an optimum wall thickness of 51.8nm showed approximately 8 times higher response, compared to that with 21.14nm wall thick nanotubes, to the ethanol concentration of 500 ppm at the temperature of $300^{\circ}C$. The wall thickness of 51.8nm was found to be a little larger than 46nm, which was theoretically derived Debye length. Along with the study of the wall thickness effect on the performance of the sensors, the mechanisms of gas sensing of the polycrystalline ZnO nanotubes are also discussed.

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