Enhanced ultrasensitive detection of ozone gas using reduced graphene oxide-incorporated LaFeO₃ nanospheres for environmental remediation process

An efficient and facile benign approach to develop reduced graphene oxide (rGO) incorporated into perovskite LaFeO₃ nanostructure with excellent surface area to detect ultrasensitive Ozone (O₃) gas for environmental remediation has been demonstrated. The prepared rGO/LaFeO₃ nanocomposites have diameter in the range ~ 1 μm constituting nanospheres with average size ~ 50 nm. Phase purity and chemical composition of rGO/LaFeO₃ nanocomposites were revealed through XRD and XPS analysis. The ozone gas sensing performance of rGO/LaFeO₃ nanocomposites was investigated and found to exhibit excellent sensitivity, high selectivity, good response (20 and 31 s) and recovery time (39 and 31 s) for 80 ppb at 100 °C when compared to pure LaFeO₃ nanostructures. These results indicate that the composites of rGO not only enhanced the ozone gas sensing response at low ppb concentration, but also a decrease in the working temperature. From these perspectives, rGO/LaFeO₃ nanocomposites based ozone gas sensor can be regarded as a promising candidate for environmental remediation process in near future.