Journal
NANOSCALE RESEARCH LETTERS
Volume 12, Issue -, Pages -Publisher
SPRINGER
DOI: 10.1186/s11671-017-1951-x
Keywords
CeO2; Coprecipitation; Microspheres; Gas sensor
Funding
- Tecnologico de Monterrey, Campus Monterrey, through the Research Chair in Nanotechnology and Devices Design
- Coordinacion General Academica of Universidad de Guadalajara through the PRO-SNI program
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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 degrees C yielded single-phase CeO2 microspheres, with a diameter in the range 0.5-2.6 mu m, 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 degrees 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.
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