Gas sensors based on single-wall carbon nanotubes and polypyrrole-coated carbon nanotubes

ORAL

Abstract

We have fabricated gas sensors based on single-wall carbon nanotubes and detected NH3 and NO2 gas. At the room temperature, the absorbed gas molecules are not easily detached from the CNT surface. So, we have testes the gas sensor at high temperatures and investigated the temperature dependences of electrical properties of CNTs above the room temperatures. Depending on the gas atmosphere and the temperature, large hysteresis has been observed. In addition, in order to improve the properties of gas sensor, we have electro-deposited polypyrrole onto CNTs and compared with SWNT without polypyrrole.

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Authors

  • Young Wook Chang

    Dept. of Physics, Yonsei Univ., Dept. of Physics, Yonsei University

  • Je Seung Oh

    National Core Research Center for Nanomedical Technology, Yonsei Univ., National Core Research Center for Nanomedical Technology, Yonsei University

  • Seung Hwan Yoo

    Dept. of Physics, Yonsei Univ., Dept. of Physics, Yonsei University

  • Ji Hun Kim

    Dept. of Physics, Yonsei Univ., Dept. of Physics, Yonsei University

  • Hyang Hee Choi

    National Core Research Center for Nanomedical Technology, Yonsei Univ., National Core Research Center for Nanomedical Technology, Yonsei University

  • Kyung-Hwa Yoo

    Department of Physics, Dept. of Physics and National Core Research Center for Nanomedical Technology, Yonsei Univ., Department of Physics, Yonsei University, Dept. of Physics and National Core Research Center for Nanomedical Technologyl, Yonsei University, Dept. of Physic, Dept. of Physics and National Core Research Center for Nanomedical Technology, Yonsei University