ZnO Nanowires/Nanobelts Structured CO Gas Sensor
نویسندگان
چکیده
Zinc oxide nanowires/nanobelts thin films were prepared by thermal evaporation deposition of Zn on two different kinds of substrates, namely Cr-glass and Cr-<100> n-type Si. ZnO nanostructured based COgas sensing thin films were formed, and the morphologies of these films were investigated by scanning electron microscopy (SEM). The sensing response of the films toward CO gas at operating temperatures in the range of (150-200) o C were studied. The set-up designed to measure the gas sensing ability due to the change of the resistivity related to the gas addition, the electrical resistivity as well as the gas sensing properties of the ZnO nanowires/nanobelts films changed significantly with the operating temperatures. The sensitivity increased with increasing operating temperature, particularly above 175 o C where it increased by three folds. Typically ZnO nanowires/nanobelts thin film sensor had fast rise times (~4s) and (~24s) and good recovery times (~2s) and (~12s) for glass and silicon substrates, respectively.
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