Abstract
Perovskite oxides are a type of interesting advanced materials for the development of gas sensors with enhanced properties. In this work, LaFeO3 nanocrystalline powders were synthesized through the simple and economical microwave-assisted solution method. Thermal decomposition of precursors allowed the formation of orthorhombic LaFeO3 at relatively low temperatures compared with the conventional solid-state synthesis. The influence of the chelating agent (ethylenediamine) content on the perovskite’s crystallite size was investigated. Our results indicated that increasing the ethylenediamine/metallic ions (E:M) molar ratio reduced the LaFeO3 crystallite size. Crystallite sizes varied from 50.4, 37.3, and 22.8 nm for E:M ratios 1:1, 2:1, and 4:1, respectively. Synthesized LaFeO3 powders were pressed to form pellets to evaluate the sensing response toward carbon monoxide at different concentrations (0, 5, 50, 100, 200, and 300 ppm) and different temperatures (25, 100, 200, and 300 °C). The pellets exhibited high sensitivity to CO, which increased with gas concentration and temperature. To corroborate LaFeO3’s ability for gas detection, dynamic tests were carried out in C3H8 atmospheres at different concentrations and operating temperatures. In this case, the measurements were done on thick films, showing good sensitivity, final stability, and reproducibility. In addition, it was observed that by reducing the crystallite size, the material’s sensitivity (or response) increased, having a more significant effect on changes in electrical resistance. Crystal size reduction is crucial in the sensor’s ability to detect low gas concentrations.
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The datasets generated during and/or analysed during the current study are available from the corresponding author on reasonable request.
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Acknowledgements
This investigation was carried out following the “line of research” “Nanostructured Semiconductor Oxides” of the academic group UDG-CA-895-"Nanostructured Semiconductors" of CUCEI, University of Guadalajara. Lorenzo Gildo Ortiz is thankful to Mexico’s National Council of Science and Technology (CONACyT) for the financial support to perform this study. Special thanks to Miguel Ángel Luna Arias, Daniel Bahena Uribe, Carlos Vizcaíno Gómez, and Darío Pozas-Zepeda for their technical assistance during the development of this work.
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LGO and JARO synthetized and developed the electrical characterization the LaFeO3 Oxide Powders. HGB and VMRB, developed the Physical characterization of LaFeO3 powders. All authors commented on previous versions of the manuscript. All authors read and approved the final manuscript.
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Gildo-Ortiz, L., Ramírez-Ortega, J.A., Guillén Bonilla, H. et al. Gas response enhancement of nanocrystalline LaFeO3 perovskite prepared using the microwave-assisted solution method. J Mater Sci: Mater Electron 34, 959 (2023). https://doi.org/10.1007/s10854-023-10375-0
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DOI: https://doi.org/10.1007/s10854-023-10375-0