Abstract
This study demonstrates the effectiveness of laterally oriented zinc oxide nanowires (ZnO NWs) grown by a hydrothermal growth (HTG) method for the fabrication of room temperature (RT) (300K) operable ethanol sensing devices. Sensing responses for various air-diluted ethanol gas mixtures (100–4000ppm) at RT are investigated. A sensing response (Rair/Rgas at 4000ppm) as high as 2.5 and a response and recovery time as low as 37 and 35s at RT, respectively, are obtained. The good ethanol sensing performance at RT could be attributed to the self-heating during sensing measurement, the high surface-to-volume ratio, good crystallinity, good ohmic contact, and full usage of the whole wire surface of the bridged laterally oriented ZnO NWs.
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