| Popis: |
LaCoO3 nanoparticles with particle sizes of ∼82 nm were prepared by co-precipitation, and mesoporous LaCoO3 thick films with a thickness of ∼7 μm were fabricated by screen printing the nanoparticles on Al2O3 substrates. The CO sensing properties of the LaCoO3 thick films were characterized in the temperature range of 100 to 550 °C. Under 5000 ppm CO at 500 °C, the thick film sensor achieved a high sensing response of ∼279.86, with response and recovery periods of 181 and 311 s, respectively. Under 25 ppm CO at 500 °C, a reasonable response of 1.04 was also achieved. Moreover, the sensor demonstrated reliable dynamic response-and-recovery at a temperature as low as 100 °C, therefore, LaCoO3 is very promising for CO sensing at low temperatures. The high response to CO could be ascribed to the high content of O22−/O− species in LaCoO3. |
