Electrical and CO-sensing properties of SmFe0.7Co0.3O3 perovskite oxide

✍ Scribed by Ru Zhang; Jifan Hu; Ma Zhao; Zhouxiang Han; Jianying Wei; Zhanlei Wu; Hongwei Qin; Kaiying Wang

• Publisher: Elsevier Science
• Year: 2010
• Tongue: English
• Weight: 313 KB
• Volume: 171
• Category: Article
• ISSN: 0921-5107
• DOI: 10.1016/j.mseb.2010.03.087

✦ Synopsis

In this work, nanocrystalline powders of perovskite-type compounds SmFe 1-x Co x O 3 (x = 0, 0.3) were prepared by sol-gel method. The morphology, electrical and carbon monoxide (CO) sensing properties of the nanocrystalline powders were studied by X-ray diffraction technique, Scanning Electron Microscopy (SEM), and electrical resistance measurements from 40 to 400 • C. The optimal value of CO-sensing response (S = R g /R a , here R a = resistances in atmospheric air with humidity = 45%, R g = resistances in CO within the background of atmospheric air with humidity = 45%) for nanocrystalline SmFe 0.7 Co 0.3 O 3 -based sensor is about 8.43 at 150 • C as the CO concentration is equal to 500 ppm. In addition, the SmFe 0.7 Co 0.3 O 3 sample shows a good selectivity to the gas CO.