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

Pd-doped α-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 α-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 α-Fe2O3 to H2S 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/α-Fe2O3 showed the largest response (128.3) to 100 ppm H2S at 160 °C.