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.