Hydrothermal preparation and acetone-sensing properties of Ni-doped porous LaFeO3 microspheres

In this paper, porous LaFeO 3 microspheres doped with Ni were prepared by an extraordinary simple one-step hydrothermal method. The proper content of Ni 2+ ions replaced the Fe atoms in LaFeO 3 microspheres and occupied the B site of perovskite. A series of gas-sensing tests have proved that the gas-sensing performance of LaFeO 3 for acetone detection has been greatly improved by adding proper amount of Ni 2+ ions to LaFeO 3 microspheres. Not only the response to 100 ppm acetone gas up to 82.75, but also the optimum operating temperature has descended 40 °C contrasts with pure LaFeO 3 microspheres. The gas sensor prepared by Ni-doped LaFeO 3 has high stability and strong recognition ability to acetone gas. This kind of transition metal ion-doped gas-sensing materials prepared by simple hydrothermal method provides a strategy for the design and development of high-performance gas sensor.