Abstract
In this paper, zinc oxide nanorods encapsulated with a representative of the zeolithic imodazole based metal organic framework family (ZIF-8) is used as gas sensor material for the detection of hydrogen gas and benzene vapour. The material properties of this ZnO@ZIF-8 hybrid material was investigated by XRD, electron microscopy, Fourier transform infrared spectroscopy and gas sensing experiments. Selectivity and sensitivity of these thin films to various gases H2 and C6H6 were also studied. The ZnO@ZIF-8 sensor with the nanostructure showed a remarkable selective response to hydrogen gas as compared to the pristine ZnO nanorods sensor, while the ZnO sensor shows high sensitivity to H2 and C6H6. The ZnO@ZIF-8 sensor exhibits a significant selective response to hydrogen compared to the original ZnO nanorod sensor. This behavior can be attributed to the small pore aperture of ZIF-8, where H2 molecules it can easily spread through the ZIF-8 network and reach the ZnO surface. This result indicate that the selectivity of ZnO gas sensor can be regulated by surface ZIF-8 coating.
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