title: Simple Route to Obtain Nanostructured CeO2Microspheres and CO Gas Sensing Performance.
abstract: In this work, nanostructured CeO2microspheres with high surface area and mesoporosity were prepared by the coprecipitation method, in absence of a template. The reaction between cerium nitrate and concentrated formic acid produced cerium formate, at room temperature. Further, calcination at 300 °C yielded single-phase CeO2microspheres, with a diameter in the range 0.5-2.6 μm, the surface of these microspheres is completely nanostructured (diameter about 30-90 nm). CeO2microspheres were used to fabricate a sensor device, and it was tested for intermediate CO gas concentrations (200-800 ppm). The detection of 200 ppm carbon monoxide was observed at 275 °C, with a response time of 9 s, using an applied frequency of 100 kHz. The detection of changes on the CO gas concentration was studied at different temperatures and applied frequencies. The results revealed a reproducible and stable gas sensing response.
authors.affiliation: Escuela de Ingenieria y Ciencias, Tecnologico de Monterrey, Campus Monterrey, Ave. Eugenio Garza Sada 2501, 64849, Monterrey, N.L., México. edgarl@itesm.mx.
authors.forename: Edgar R
authors.initials: ER
authors.lastname: López-Mena
authors.affiliation: Departamento de Física, CUCEI, Universidad de Guadalajara, 44410, Guadalajara, Jal., México.
authors.forename: Carlos R
authors.initials: CR
authors.lastname: Michel
authors.affiliation: Departamento de Ingeniería Química, CUCEI, Universidad de Guadalajara, 44410, Guadalajara, Jal., México.
authors.forename: Alma H
authors.initials: AH
authors.lastname: Martínez-Preciado
authors.affiliation: Escuela de Ingenieria y Ciencias, Tecnologico de Monterrey, Campus Monterrey, Ave. Eugenio Garza Sada 2501, 64849, Monterrey, N.L., México.
authors.forename: Alex
authors.initials: A
authors.lastname: Elías-Zuñiga
keywords: CeO2; Coprecipitation; Gas sensor; Microspheres