CO₂ gas sensors based on La_1?xSr_xFeO₃ nanocrystalline powders

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• 作者：Kai FanAuthor Vitae ; Hongwei QinAuthor Vitae ; Lei WangAuthor Vitae ; Lin JuAuthor Vitae ; Jifan Hu ; ^{hu-jf@vip.163.com}Author Vitae
• 关键词：Gas sensors ; CO2 ; Perovskite
• 刊名：Sensors and Actuators B: Chemical
• 出版年：2013
• 出版时间：February, 2013
• 年：2013
• 卷：177
• 期：Complete
• 页码：265-269
• 全文大小：520 K

文摘

The La_1?xSr_xFeO₃ (0 ¡Ü x ¡Ü 0.3) nanocrystalline powders were prepared by sol-gel method, followed by the subsequent annealing. The sensors based on La_1?xSr_xFeO₃ nanocrystalline powders exhibit considerable response to CO₂ gas. The resistance of sensors increases with an increase of CO₂ concentration in dry air. Among those sensors, La_0.8Sr_0.2FeO₃ sensor shows the best response. The response to 2000 and 4000 ppm CO₂ for La_0.8Sr_0.2FeO₃ at its optimal temperature of 380 ¡ãC are 1.25 and 1.36, respectively. The response and recovery times to 2000 ppm CO₂ for La_0.8Sr_0.2FeO₃ at 380 ¡ãC are 11 and 5 min, respectively. La_0.2Sr_0.8FeO₃ sensor shows larger CO₂ response in the background of oxygen than in the background of dry air. Such results show that the oxygen adsorbed on the surface of semiconductor may be involved in the sensing process of CO₂ in dry air for La_1?xSr_xFeO₃. The possible CO₂ sensing mechanisms for La_1?xSr_xFeO₃ sensors are discussed.