Journal
MATERIALS SCIENCE AND ENGINEERING B-SOLID STATE MATERIALS FOR ADVANCED TECHNOLOGY
Volume 140, Issue 1-2, Pages 98-102Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.mseb.2007.04.004
Keywords
gas sensor; Pd-doped alpha-Fe2O3; H2S; low power consumption
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Pd-doped alpha-Fe2O3 nanoparticles were synthesized by chemical coprecipitation method and characterized by X-ray diffraction (XRD) and transmission electron microscopy (TEM). The gas sensing properties of undoped and Pd-doped alpha-Fe2O3 sensors were investigated. Compared with the undoped one, the doped sensors exhibited higher response, better selectivity, and faster response/recovery to H2S. The operating temperature of alpha-Fe2O3 to HS is decreased after the addition of Pd, which result in the relative low power consumption in H2S detection. Among all the doped sensors, the sensor of 1.5 wt% Pd/alpha-Fe2O3 showed the largest response (128.3) to 100 ppm H2S at 160 degrees C. (C) 2007 Elsevier B.V. All rights reserved.
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