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LaCoO3-based sensors with high sensitivity to carbon monoxide

机译：基于LaCoO3的传感器对一氧化碳具有高灵敏度

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LaCoO3 nanoparticles with particle sizes of similar to 82 nm were prepared by co-precipitation, and mesoporous LaCoO3 thick films with a thickness of similar to 7 mu m 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 degrees C. Under 5000 ppm CO at 500 degrees C, the thick film sensor achieved a high sensing response of similar to 279.86, with response and recovery periods of 181 and 311 s, respectively. Under 25 ppm CO at 500 degrees 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 degrees 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 O-2(2-)/O- species in LaCoO3.
机译：通过共沉淀制备粒径相似于82 nm的LaCoO3纳米颗粒，并通过在Al2O3基板上丝网印刷纳米颗粒来制备厚度相似于7μm的中孔LaCoO3厚膜。 LaCoO3厚膜的CO感测特性在100至550摄氏度的温度范围内进行了表征。在500摄氏度的5000 ppm CO下，该厚膜传感器实现了类似于279.86的高感测响应，并具有响应和恢复周期分别为181和311 s。在500摄氏度的25 ppm CO下，还获得了1.04的合理响应。此外，该传感器在低至100摄氏度的温度下显示出可靠的动态响应和恢复，因此，LaCoO3对于在低温下进行CO感测非常有前途。对CO的高响应可能归因于LaCoO3中O-2（2-）/ O-种类的高含量。

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