Key processing of porous and fibrous LaCoO3 nanostructures for successful CO and propane sensing |
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Authors: | L Gildo-Ortiz H Guillén-Bonilla VM Rodríguez-Betancourtt O Blanco-Alonso A Guillén-Bonilla J Santoyo-Salazar IC Romero-Ibarra J Reyes-Gómez |
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Affiliation: | 1. Departamento de Física, CUCEI, Universidad de Guadalajara, 44410 Guadalajara, Jalisco, México;2. Departamento de Ingeniería de Proyectos, CUCEI, Universidad de Guadalajara, 44410 Guadalajara, Jalisco, México;3. Departamento de Química, CUCEI, Universidad de Guadalajara, 44410 Guadalajara, Jalisco, México;4. Departamento de Ciencias Computacionales e Ingenierías, CUVALLES, Universidad de Guadalajara, 46600 Ameca, Jalisco, México;5. Departamento de Física, CINVESTAV, IPN, 07360 Ciudad de México, México;6. Unidad Profesional Interdisciplinaria en Ingeniería y Tecnologías Avanzadas, IPN, 07340 Ciudad de México, Mexico;g. Facultad de Ciencias, Universidad de Colima, 28045 Colima, México |
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Abstract: | Currently, perovskite structures have had an important impact in the development of gas sensors. In this work, perovskite LaCoO3 nanoparticles were synthesized by a simple, economic and reproducible processing by the solution method. The reactive precursors were nitrates of lanthanum and cobalt, using ethylenediamine as a chelating agent and distilled water as solvent. The gel formed by the solvent evaporation (through microwave radiation) was dried at 200?°C and later calcined at 300, 400, 500, 600, and 700?°C for 5?h. The samples were analyzed by X-ray diffraction, infrared spectroscopy, thermogravimetry, scanning, transmission, and atomic force microscopies, and nitrogen physisorption. These analyses confirmed the formation of LaCoO3 nanoparticles (size ~ 47?nm) at relatively low temperatures. The particles showed a continuous connectivity, generating a porous surface with a fibrous appearance. Starting with the synthesized powders, pellets were made and tested as gas sensors in carbon monoxide and propane atmospheres (at concentrations of 0–300?ppm) at different temperatures (25, 150, 250, and 350?°C). The nanoparticles presented high sensitivity, with a greater response in the propane atmosphere. |
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Keywords: | A Powders: chemical preparation B Electron microscopy D Perovskites E Sensors |
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