Stable and highly sensitive gas sensors based on semiconducting oxide nanobelts

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Date
2002-09-02Author
Comini, E.
Faglia, G.
Sberveglieri, G.
Pan, Zhengwei
Wang, Z. L. (Zhong Lin)
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Show full item recordAbstract
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.