CO Sensing Properties of Nanostructured La0.8Sr0.2CoO3 Sensors Synthesized by EDTA-Glycol Method (original) (raw)
2008, Sensors & Transducers
We report a simple method for the preparation of pure LaCoO3 and La1-xSrxCoO3 (x = 0.1, 0.2 and 0.25) nanostructures by the EDTA-Glycol method. The final powders obtained by this method have been investigated by X-ray diffraction (XRD) and scanning electron microscopy (SEM) measurements. The gas sensitivity of pure and Sr doped LaCoO3 samples were investigated for CO, NH3, H2 and LPG. La0.8Sr0.2CoO3 powders (sample GIII) calcined at 6500C, exhibited a good sensor response towards CO gas at 2500C. On impregnation of 1 wt.% Pd over sample GIII, the operation temperature reduced to 2000C with a significant rise in sensitivity. The response time also decreases from about 3.5 min for sample GIII to less than 2.5 min for the Pd loaded element. The electronic interaction between Pd and metal oxide semiconductor is proposed to account for the sensitization effect.
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