La[Fe(CN)6]·5H2O-derived LaFeO3 hexagonal nano-sheets as low-power n-propanol sensors

The semiconductors based on lanthanum ferrite (LaFeO 3 ) 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 LaFeO 3 -based gas sensors with high electrical conductivity and low prime working temperature. Based on this consideration, porous LaFeO 3 hexagonal nano-sheets were prepared via thermal decomposition of La[Fe(CN) 6 ]·5H 2 O, which was synthesized by a facile co-precipitation method. The LaFeO 3 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. Graphical Abstract Gas sensor based on the fabricated porous LaFeO 3 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.