Flexible ultra-sensitive and resistive NO(2) gas sensor based on nanostructured Zn((x))Fe((1−x)2)O(4)

Low concentration gas detection, rapid response time and low working temperature are anticipated for a varied range of toxic gas detection applications. Conversely, the existing gas sensors suffer mostly from a high working temperature along with a slow response at low concentrations of analytes. Here, we report an ultrasensitive flexible nanostructured Zn((x))Fe((1−x)2)O(4) (x = 0.1, 0.5 and 0.9) based chemiresistive sensor for nitrogen dioxide (NO(2)) detection. We evince that the prepared flexible sensor Zn((0.5))Fe((0.5)2)O(4) has detection potential as low as 5 ppm at a working temperature of 90 °C in a short phase. Further, the Zn((0.5))Fe((0.5)2)O(4) sensor exhibits excellent selectivity, stability and repeatability. The optimized sensor sensing characteristics can be helpful in tremendous development of foldable mobile devices for environmental monitoring, protection and control.