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    Stable and highly sensitive gas sensors based on semiconducting oxide nanobelts

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    2002_16b_02_APL_5.pdf (87.27Kb)
    Date
    2002-09-02
    Author
    Comini, E.
    Faglia, G.
    Sberveglieri, G.
    Pan, Zhengwei
    Wang, Z. L. (Zhong Lin)
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    Abstract
    Gas sensors have been fabricated using the single-crystalline SnO₂ nanobelts. Electrical characterization showed that the contacts were ohmic and the nanobelts were sensitive to environmental polluting species like CO and NO₂ , as well as to ethanol for breath analyzers and food control applications. The sensor response, defined as the relative variation in conductance due to the introduction of the gas, is 4160% for 250 ppm of ethanol and 21550% for 0.5 ppm NO₂ at 400 °C. The results demonstrate the potential of fabricating nanosized sensors using the integrity of a single nanobelt with a sensitivity at the level of a few ppb.
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    http://hdl.handle.net/1853/27089
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