In this work,porous La_(1-x)Ba_(x)FeO_(3)(x=0.01,0.02,0.03,0.04 and 0.05) microspheres of the orthorhombic perovskite phase were prepared by an environment-friendly one-step hydrothermal method with a series of charac...In this work,porous La_(1-x)Ba_(x)FeO_(3)(x=0.01,0.02,0.03,0.04 and 0.05) microspheres of the orthorhombic perovskite phase were prepared by an environment-friendly one-step hydrothermal method with a series of characterization of the six sensing nanomaterials.Characterization results show that their grain size is between 21.2 and 23.2 nm,and the grain growth is inhibited with the increase in Ba-doping concentration.The samples are all spherical with a diameter of about 10 μm,and the surface is very rough.By the gas sensing study of the samples,the results show that the La_(1-x)Ba_(x)FeO_(3) sensor exhibits a fairly high response to the ethanol gas.In particular,the La_(1-x)Ba_(x)FeO_(3) microspheres with a Ba-doping concentration of 2 mol% showed not only a significant improvement in sensitivity but also a rather rapid response recovery time compared to the undoped samples,demonstrating the superiority as an ethanol sensing nanomaterial.More importantly,the optimum operating temperature of La0.98Ba0.02FeO_(3) is only 200℃,while that of the pure LaFeO_(3) is 260℃.The Ba-doped porous microspheres prepared are a high-performance sensing material capable of rapid and accurate detection of ethanol.展开更多
基金financially supported by the National Natural Science Foundation of China (Nos.61102006 and 51672110)the Natural Science Foundation of Shandong Province,China (Nos.ZR2018LE006 and ZR2015EM019)。
文摘In this work,porous La_(1-x)Ba_(x)FeO_(3)(x=0.01,0.02,0.03,0.04 and 0.05) microspheres of the orthorhombic perovskite phase were prepared by an environment-friendly one-step hydrothermal method with a series of characterization of the six sensing nanomaterials.Characterization results show that their grain size is between 21.2 and 23.2 nm,and the grain growth is inhibited with the increase in Ba-doping concentration.The samples are all spherical with a diameter of about 10 μm,and the surface is very rough.By the gas sensing study of the samples,the results show that the La_(1-x)Ba_(x)FeO_(3) sensor exhibits a fairly high response to the ethanol gas.In particular,the La_(1-x)Ba_(x)FeO_(3) microspheres with a Ba-doping concentration of 2 mol% showed not only a significant improvement in sensitivity but also a rather rapid response recovery time compared to the undoped samples,demonstrating the superiority as an ethanol sensing nanomaterial.More importantly,the optimum operating temperature of La0.98Ba0.02FeO_(3) is only 200℃,while that of the pure LaFeO_(3) is 260℃.The Ba-doped porous microspheres prepared are a high-performance sensing material capable of rapid and accurate detection of ethanol.
