Synthesis and characterization of Pd-doped α-Fe2O3 H2S sensor with low power consumption

Abstract Pd-doped α-Fe 2 O 3 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 α-Fe 2 O 3 sensors were investigated. Compared with the undoped one, the doped sensors exhibited higher response, better selectivity, and faster response/recovery to H 2 S. The operating temperature of α-Fe 2 O 3 to H 2 S is decreased after the addition of Pd, which result in the relative low power consumption in H 2 S detection. Among all the doped sensors, the sensor of 1.5 wt% Pd/α-Fe 2 O 3 showed the largest response (128.3) to 100 ppm H 2 S at 160 °C.

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