Highly sensitive and selective glycol gas sensor based on SmFeO3 microspheres

Abstract

Powdered SmFeO 3 samples were prepared by hydrothermal method combined with high temperature calcination. The samples' crystal structure was discovered by XRD, their morphology and microstructure were assessed by SEM and TEM, and chemical makeup and valence state were investigated by XPS. These characterizations confirmed that the prepared samples were SmFeO 3 microspheres with a perovskite structure. A resistive gas sensor was prepared using it as a sensing material, and its gas sensing performance was tested. Test results show that the SmFeO 3 sensor has a higher response (117) to 100 ppm ethylene glycol gas at lower operating temperatures (180 °C). In addition, SmFeO 3 sensor offers outstanding repeatability, stability, and selectivity. Hence, SmFeO 3 microspheres are a promising ethylene glycol sensor.