La-Fe-O Perovskite Based Gas Sensors: Recent Advances and Future Challenges

Abstract

Interest in the importance of gas sensing devices has increased significantly due to their critical function in monitoring the environment and controlling pollution, resulting in an increased market demand. The present review explores perovskite La-Fe-O based gas sensors with a special focus on LaFeO₃ and evaluates their sensitivity to a diverse range of practical target gases that need to be monitored. An analysis has been conducted to assess different routes not only of synthesizing LaFeO₃ material but also of characterization with the targeted use for their gas sensing abilities. Additionally, a comprehensive analysis has been performed to explore the effect of introducing other elements through doping. In view of the LaFeO₃ sensing performance, more common gases like acetone, ethanol, methanol, formaldehyde, NO_x, and CO₂ have been targeted. In addition, a discussion on uncommon gases such as CO, SO₂, TEA, C₂H₅, C₆H₆, and others is also made to give a complete picture of LaFeO₃-based gas sensors. The summary and conclusion section of the study addresses the primary obstacles in the synthesis process, the variables that restrict the sensing capabilities of LaFeO₃, and its commercial fulfillment.