Study on the preparation and performance of flexible sulfur dioxide gas sensors based on metal-organic framework

Sulfur dioxide (SO2) pollution often poses a threat to the environment and human health, and there is an urgent need to develop flexible and convenient SO2 detection materials. MOF-5 treated with amino groups was added to polyvinyl alcohol, and then MOF-5-NH2/Polyvinyl alcohol (PVA) nanocomposite films were made by electrostatic spinning technology, and the MOF-5-NH2/PVA composite films such as mechanical and thermal stability and sensing of SO2 were systematically investigated. The results show that the MOF-5-NH2/PVA nanocomposite film has a certain tensile strength of 1.42 MPa, and the thermal stability of the MOF-5-NH2/PVA nanocomposite film is getting better as the ratio of MOF-5-NH2/PVA increases and the diameter of the fiber becomes smaller. Moreover, the produced composite film has fluorescence turn-on effect only for SO2, but not for other gases, showing a good specificity. Therefore, this study provides a new strategy for the preparation of highly sensitive and specific SO2 sensors.