CO Sensing Properties of La1-xCaxFeO3 Perovskite Nanocrystalline Materials

Ming Zhao; Li Hui Sun; Ji Fan Hu; Hong Wei Qin

doi:10.4028/www.scientific.net/KEM.495.323

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HomeKey Engineering MaterialsKey Engineering Materials Vol. 495CO Sensing Properties of La1-xCaxFeO3 Perovskite...

CO Sensing Properties of La1-xCaxFeO3 Perovskite Nanocrystalline Materials

Abstract:

The La1-xCaxFeO3 nanocrystalline powders were prepared by sol-gel method. These powders crystallized as perovskite orthorhombic structure. With an increase of Ca content, the resistance of La1-xCaxFeO3 sensors in air decreases at first, undergoes a minimum at x=0.3, and then increases again. La1-xCaxFeO3-based sensors show sensitive responses to CO. Among those La1-xCaxFeO3-based sensors, the sensor with x=0.2 shows the highest response to 200 ppm CO at operating temperatures below 325°C. The highest response S=(RCO-Rair)/RCO for the La0.8Ca0.2FeO3 based sensor to 200 ppm CO is 87% with response time 15 s and recovery time 60 s at an operating temperature of 100°C.

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Periodical:

Key Engineering Materials (Volume 495)

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323-326

DOI:

https://doi.org/10.4028/www.scientific.net/KEM.495.323

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Online since:

November 2011

Authors:

Ming Zhao, Li Hui Sun, Ji Fan Hu, Hong Wei Qin

Keywords:

Carbon Monoxide, Gas Sensor, Nanocrystalline, Perovskite

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