Abstract
This paper demonstrated a SO2 sensor based on metal organic frameworks (MOFs)-derived titanium dioxide (TiO2)/reduced graphene oxide (rGO) nanocomposite. The MOFs-derived TiO2/rGO film was deposited on an epoxy substrate with interdigital electrodes and served as sensing material. The properties of MOFs TiO2/rGO nanocomposite in terms of microstructure, elementary composition and morphology were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), X-ray photoelectron spectroscopy (XPS) and transmission electron microscopy (TEM). The SO2-sensing properties of the MOFs TiO2/rGO film sensor were measured at room temperature. The results illustrate that the MOFs-derived TiO2/rGO sensor exhibits a great sensing performance toward SO2 gas, including high response value, quick response/recovery time, and outstanding stability. These results render the MOFs TiO2/rGO nanocomposite an efficient sensing material for constructing high-performance SO2 sensor. Finally, the mechanism of the enhanced SO2 sensing properties was attributed to the unique nanostructure and the large specific surface area of MOFs TiO2/rGO nanocomposite.
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