LaFeO3 Perovskite as a Promising Material for Humidity Sensing Applications

Muhammad Aqif1, Djoko Triyono1,[*] , Akhmad Futukhillah Fataba Alaih1, Rifqi Almusawi Rafsanjani1

1 Department of Physics, Faculty of Mathematics and Natural Sciences, University of Indonesia, Depok 16424, Indonesia.

* Corresponding author: djoko.triyono@sci.ui.ac.id

Abstract. Humidity sensors play a vital role in various applications, including environmental monitoring, industrial processes, and healthcare. The study reports the preparation of a LaFeO₃-based humidity sensor using an economical sol-gel process. X-ray diffraction (XRD), scanning electron microscopy (SEM), and X-ray fluorescence energy-dispersive X-ray spectroscopy (XRF-EDX) were used to characterize the structure and morphology. XRD analysis confirmed the formation of a well-crystallized perovskite phase, while SEM imaging revealed a porous microstructure that enhances surface area, facilitating effective water vapor adsorption. The material's homogeneous distribution of La, Fe, and O was confirmed by elemental composition analysis using XRF-EDX. The response dynamics of the manufactured sensor LaFeO3 demonstrated a quick response time of 1.9 seconds, a recovery time of 1.3 seconds, minimum hysteresis (2%), and good sensitivity to humidity. These results highlight the potential of LaFeO₃-based sensors for accurate and reliable humidity measurement.

Keywords: Perovskites LaFeO3, Humidity Sensor, Response Dynamics.