Issue 125, 2015

CO2 sensing properties of La1−xBaxFeO3 thick film and packed powder sensors

Abstract

We compared the CO2 sensing properties of La1−xBaxFeO3 packed powder and thick film sensors. The thick film sensor exhibits a larger response to CO2 gas with lower working temperature and shorter response and recovery times than the packed powder sensor because the former exposes a larger surface, absorbs the oxygen and interacts with CO2 gas more easily than the latter. However, the resistance of the thick film sensor is much larger than the packed powder sensor. La0.8Ba0.2FeO3 sensor exhibits the largest CO2 response among all La1−xBaxFeO3 packed powder and thick film sensors investigated. The response for the La0.8Ba0.2FeO3 thick film sensor to 2000 ppm CO2 at 150 °C is 2.29 and the response and recovery times are 14 s and 8 s, respectively. In addition, the CO2 responses for these two types of La0.8Ba0.2FeO3 sensors decrease with increase in the humidity. The possible sensing mechanisms of La1−xBaxFeO3 sensors are discussed.

Graphical abstract: CO2 sensing properties of La1−xBaxFeO3 thick film and packed powder sensors

Article information

Article type
Paper
Submitted
16 Aug 2015
Accepted
05 Nov 2015
First published
10 Nov 2015

RSC Adv., 2015,5, 103073-103081

CO2 sensing properties of La1−xBaxFeO3 thick film and packed powder sensors

L. Li, H. Qin, C. Shi, L. Zhang, Y. Chen and J. Hu, RSC Adv., 2015, 5, 103073 DOI: 10.1039/C5RA16509A

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