A highly selective and sensitive H2S sensor at low temperatures based on Cr-doped α-Fe2O3 nanoparticles. Issue 8 (31st January 2019) - Xue, Dongyang
Abstract : Cr-doped α-Fe2 O3 nanoparticles were synthesized by one-step hydrothermal reaction and showed high sensitivity and selectivity to H2 S at low temperature. Abstract : Cr-doped α-Fe2 O3 nanoparticles were synthesized by a low-cost and environmentally friendly hydrothermal route. Their gas sensing properties were investigated and the sensor showed high sensitivity and selectivity to H2 S gas. Different Cr doping levels from 0 to 8.0 wt% were studied, and the sensor of 4.0 wt% Cr-doped α-Fe2 O3 showed the largest response, with a response of 213 to 50 ppm H2 S at 100 °C. The incorporation of Cr ions within α-Fe2 O3 nanocrystals increases the specific surface area, and promotes the oxidation of H2 S and oxygen adsorption in the air. Thus, the doping of Cr into α-Fe2 O3 nanostructures would be a promising method for designing and fabricating high performance H2 S gas sensors.