Hydrogen Sulfide Gas Sensor Based on Graphitic Nitrogen Carbide/Alpha-Iron Oxide Binary Nanostructure

The graphitic nitrogen carbide/alpha-iron oxide (g-C ₃ N ₄ /α-Fe ₂ O ₃ ) nanostructure is prepared by hydrothermal method. The g-C ₃ N ₄ /α-Fe ₂ O ₃ hybrid was characterized by scanning electron microscope (SEM), transmission electron microscope (TEM), X-ray (XRD). The hybrid material was deposited over interdigital sensing electrodes on a PET substrate. The prepared sensor exhibited excellent response characteristics for detecting H ₂ S gas, which was superior than that of pure α-Fe ₂ O ₃ counterpart. The detection limit of the sensor for H ₂ S gas is 0.5 ppm at room temperature. Moreover, the g-C ₃ N ₄ /α-Fe ₂ O ₃ sensor has a higher selectivity over the interference gas species of SO ₂ F ₂ , CO, and SO ₂ . The results suggest that the α-Fe ₂ O ₃ sensor is a good candidate for sensing decomposed SF6 products in environ and healthcare fields.