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.