CO2 sensing properties and mechanism of PrFeO3 and NdFeO3 thick film sensor
来源期刊：JOURNAL OF RARE EARTHS2019年第1期
论文作者：Yanping Chen Dandan Wang Hongwei Qin Heng Zhang Zhongli Zhang Guangjun Zhou Chengyong Gao Jifan Hu
文章页码：80 - 87
摘 要：The CO2 sensing of PrFeO3 and NdFeO3 sensors were investigated. Experimental results show that the resistances for PrFeO3 and NdFeO3 in CO2 gas are larger than those in air and the responses for PrFeO3and NdFeO3 sensors increase with an increase in room-temperature relative humidity. When exposed to1000 ppm CO2, the response of PrFeO3 thick film based on nano-powders annealed at 700℃can reach8.44 at 160℃for the background of wet air with 58%of room-temperature relative humidity （RH）,which is much larger than the corresponding value （3.03） in wet air with 25%RH. The sensing response S of NdFeO3 thick-film sensor based on nano-powders annealed at 600℃to 3000 ppm CO2 at the operating temperature 200℃can reach 2.36 for the background of wet air with 72%RH, which is larger than the corresponding value （1.83） in the air with 25%RH. Compared with other CO2 sensing materials, the PrFeO3 sensor has larger response at lower operating temperature for CO2 gas and may be used as a new CO2 sensing material.
Yanping Chen1，Dandan Wang1，Hongwei Qin1，Heng Zhang1，Zhongli Zhang2，Guangjun Zhou1，Chengyong Gao1，Jifan Hu1
1. State Key Laboratory for Crystal Materials, School of Physics,Shandong University2. Shandong Institute for Product Quality Inspection
摘 要：The CO2 sensing of PrFeO3 and NdFeO3 sensors were investigated. Experimental results show that the resistances for PrFeO3 and NdFeO3 in CO2 gas are larger than those in air and the responses for PrFeO3and NdFeO3 sensors increase with an increase in room-temperature relative humidity. When exposed to1000 ppm CO2, the response of PrFeO3 thick film based on nano-powders annealed at 700℃can reach8.44 at 160℃for the background of wet air with 58%of room-temperature relative humidity （RH）,which is much larger than the corresponding value （3.03） in wet air with 25%RH. The sensing response S of NdFeO3 thick-film sensor based on nano-powders annealed at 600℃to 3000 ppm CO2 at the operating temperature 200℃can reach 2.36 for the background of wet air with 72%RH, which is larger than the corresponding value （1.83） in the air with 25%RH. Compared with other CO2 sensing materials, the PrFeO3 sensor has larger response at lower operating temperature for CO2 gas and may be used as a new CO2 sensing material.
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