López-Mena, Edgar RMichel, Carlos RMartínez-Preciado, Alma HElías-Zuñiga, AlexLópez-Mena, Edgar RMichel, Carlos RMartínez-Preciado, Alma HElías-Zuñiga, Alex2017-05-052017-05-0506/03/2017Nanoscale Research Letters. 2017 Mar 06;12(1):169http://dx.doi.org/10.1186/s11671-017-1951-xhttp://hdl.handle.net/11285/622455Abstract In this work, nanostructured CeO2 microspheres 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 CeO2 microspheres, with a diameter in the range 0.5–2.6 μm, the surface of these microspheres is completely nanostructured (diameter about 30–90 nm). CeO2 microspheres 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.http://creativecommons.org/licenses/by-nc-nd/4.0/Artículo de revistaengThe Author(s).2017-05-05