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Gas Sensing Behavior of Nano-LaFeO3 Thick Films Prepared Through Microwave Heating Method

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Nano-LaFeO3 powders are obtained through heating precursors using microwave method. LaFeO3 thick film sensors are fabricated by using LaFeO3 materials as sensing materials. The phase composition and morphology of particles in these materials are characterized through X-ray diffraction (XRD) and transmission electron microscopy (TEM), respectively. The XRD analysis results reveal that LaFeO3 can be obtained even with 264 W heating power. TEM images manifest that the average particle sizes change little with heating power increasing, the particle sizes are in the range of 20–100 nm when the heating power is 264 W, 440 W, 616 W and 800 W (heating duration is 15 min). It is found that the sensor based on LaFeO3 (800 W, 15 min) exhibits best performance in all sensors investigated in this paper. In detail, the responses of the sensor based on LaFeO3(800 W, 15 min) to 1000 ppm and 0.001 ppm (CH3)3 N at 255 °C are as high as 999 and 2, respectively; microwave heating method decreases the response time and recovery time comparing with the sensor based on LaFeO3 heated with muffle furnace, the response time and recovery time for 100 ppm trimethylamine are 2 sec. and 2 sec., respectively.
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Document Type: Research Article

Publication date: August 1, 2010

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