Zr‐MOF Combined with Nanofibers as an Efficient and Flexible Capacitive Sensor for Detecting SO₂

Abstract The fabrication of gas sensors with flexible properties and sensitive performances is of great importance for improving wearable sensing electronics. Herein, we coated a metal‐organic framework (UiO‐66‐NH₂) on flexible electrospun polyvinylidenefluoride (PVDF) nanofibers as sensing layer for real‐time monitoring of toxic SO₂ at room temperature. The developed capacitive sensor possesses a great bending flexibility, excellent cycling stability, high detection sensitivity, light weight as well as portable ability. The fabricated sensor possesses a short response time with 435 s and 185 s towards 150 ppm and 1 ppm, respectively. Importantly, the flexible sensor still maintained outstanding sensing behavior with the retention value of 98.4% in the detection of SO₂ at 10 ppm after bending 2000 times. In addition, significant cycling performance was desirably achieved, and the response value of the sensor was also kept at about 88.7% towards 50 ppm SO₂, compared with original sensor after 20 days. This strategy can provide promising applications for the development of wearable devices for the detection of harmful gases.