LaFeO3 ceramics as selective oxygen sensors at mild temperature |
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| Authors: | Imen Jaouali Hayfa Hamrouni Noomen Moussa Mohamed Faouzi Nsib Miguel Angel Centeno Anna Bonavita Giovanni Neri Salvatore Gianluca Leonardi |
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| Affiliation: | 1. U.R. Catalyse et Matériaux pour l′Environnement et les Procédés, Faculty of Sciences of Gabes, University of Gabes, Gabes 6072, Tunisia;2. Department of Engineering, University of Messina, Messina 98166, Italy;3. Institute of Materials Science of Sevilla, Mixte Center US-CSIC, Sevilla 41092, Spain;4. High School of Sciences and Technology of Hammam Sousse, University of Sousse, Sousse 4011, Tunisia |
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| Abstract: | In this study, an investigation about the oxygen sensing properties of lanthanum orthoferrite (LaFeO3) ceramics is reported. LaFeO3 nanoparticles were synthesized by using tartaric sol-gel route and annealed in air at different temperatures (500, 700 and 900 °C). The samples have been characterized by using thermal analysis (TA), BET surface area and porosity, Fourier-transform infrared spectroscopy (FTIR), Raman spectroscopy, X-ray diffraction (XRD), and scanning electron microscopy (SEM). Results of sensing tests indicate that LaFeO3 nanoparticles exhibit good response to oxygen at mild temperatures (300–450 °C). The effect of annealing temperature on gas sensing performance was investigated, demonstrating that LaFeO3 ceramics obtained after annealing at 500 °C display better characteristics with respect to others. The oxygen sensor developed shows also high stability in humid environment and excellent selectivity to oxygen over other interfering gases such as CO, NO2, CO2, H2 and ethanol. |
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| Keywords: | Gas sensor Perovskite Oxygen Sol-gel |
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