An Enhanced Fast Ethanol Sensor Based on Zinc Oxide/Nickel Oxide Nanocomposite in Dynamic Situations

Measuring ethanol levels in dynamic conditions calls for smart fast response sensors. Herein we report, fabrication and characterization of a Zinc oxide/Nickel oxide nanocomposite (ZN) for use as an ethanol gas (ET) sensor. Based on XRD, FESEM, and BET measurements, it is found that the formed ZN has a novel nano-worm morphology, and the specific surface area about 19.5 m(2) gm(-1). The ET sensing results of the ZN sensor (ZNS) toward 0.025 vol% ET demonstrated an appropriate response value of 32.48% with a less response/recovery time of 2.7/3.6 s at room temperature. Moreover, the effect of various humidity levels on the sensor response as a function of gas concentration investigated. Our handmade sensor revealed not only long-term stability over four months with a small degradation of 9%, but also the excellent selectivity toward the ET than other gases. Finally, the ET sensing mechanism of the ZNS discussed, as well. Graphic