Journal
SENSORS AND ACTUATORS B-CHEMICAL
Volume 133, Issue 1, Pages 340-344Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.snb.2008.02.033
Keywords
sol-gel method; X-ray diffraction; methane-gas sensing
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The nominal La1-xMgxFeO3 powder was prepared by a sol-gel method using citric acid. The compound crystals were of a perovskite phase with orthorhombic structure when x <= 0.1. It was a mixture of spinel and perovskite when x > 0.1, and the p-n heterojunctions were formed, which affected the resistance and response to methane of the samples (x > 0.1). Among all La1-xMgxFeO3 (x <= 0.7) samples, the La0.9Mg0.1FeO3-based sensors with high sensitivity, low operating temperature, and excellent stability in air can be used as a new type of gas sensing material for detecting methane gas. (c) 2008 Elsevier B.V. All rights reserved.
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