Korean Journal of Materials Research (한국재료학회지)

Materials Research Society of Korea (한국재료학회)
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Nitrogen Monoxide Gas Sensing Properties of CuO Nanorods Synthesized by a Hydrothermal Method

수열합성법으로 합성된 산화구리 나노막대의 일산화질소 가스 감지 특성

  • Park, Soo-Jeong (Graduate School of Advanced Electronic Circuit Substrate Engineering, Chungnam National University) ;
  • Kim, Hyojin (Graduate School of Advanced Electronic Circuit Substrate Engineering, Chungnam National University) ;
  • Kim, Dojin (Graduate School of Advanced Electronic Circuit Substrate Engineering, Chungnam National University)
  • 박수정 (충남대학교 차세대전자기판회로학과) ;
  • 김효진 (충남대학교 차세대전자기판회로학과) ;
  • 김도진 (충남대학교 차세대전자기판회로학과)
  • Received : 2013.10.11
  • Accepted : 2013.12.04
  • Published : 2014.01.27
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Abstract

We report the nitrogen monoxide (NO) gas sensing properties of p-type CuO-nanorod-based gas sensors. We synthesized the p-type CuO nanorods with breadth of about 30 nm and length of about 330 nm by a hydrothermal method using an as-deposited CuO seed layer prepared on a $Si/SiO_2$ substrate by the sputtering method. We fabricated polycrystalline CuO nanorod arrays at $80^{\circ}C$ under the hydrothermal condition of 1:1 morality ratio between copper nitrate trihydrate [$Cu(NO_2)_2{\cdot}3H_2O$] and hexamethylenetetramine ($C_6H_{12}N_4$). Structural characterizations revealed that we prepared the pure CuO nanorod array of a monoclinic crystalline structure without any obvious formation of secondary phase. It was found from the gas sensing measurements that the p-type CuO nanorod gas sensors exhibited a maximum sensitivity to NO gas in dry air at an operating temperature as low as $200^{\circ}C$. We also found that these CuO nanorod gas sensors showed reversible and reliable electrical response to NO gas at a range of operating temperatures. These results would indicate some potential applications of the p-type semiconductor CuO nanorods as promising sensing materials for gas sensors, including various types of p-n junction gas sensors.

Keywords

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