La[Fe(CN) 6 ]·5H 2 O-derived LaFeO 3 Hexagonal Nano-Sheets As Low-Power N -Propanol Sensors

The semiconductors based on lanthanum ferrite (LaFeO3) with perovskite structure have received increased attention for gas sensing, due to their stability and high gas-sensing response. However, it remains a challenge to design and fabricate LaFeO3-based gas sensors with high electrical conductivity and low prime working temperature. Based on this consideration, porous LaFeO3 hexagonal nano-sheets were prepared via thermal decomposition of La[Fe(CN)6]·5H2O, which was synthesized by a facile co-precipitation method. The LaFeO3 nano-sheets-based sensor possesses a relatively low resistance, which is 0.5 MΩ under air atmosphere at a low operating temperature of 100 °C, which means a low-power consumption. Moreover, the sensor exhibits an infrequent selectivity to n-propanol. This approach presents an effective way for the control and optimization of the rare earth perovskite nanomaterials for gas sensing. Gas sensor based on the fabricated porous LaFeO3 hexagonal nano-sheets presents a low resistance of 0.5 MΩ and a good sensing performance to n-propanol at a low working temperature of 100 °C.