Synthesis of Ba-doped porous LaFeO3 microspheres with perovskite structure for rapid detection of ethanol gas

• 作者: Pei Hao Guang-Min Qu Peng Song Zhong-Xi Yang Qi Wang
• 来源期刊: 稀有金属（英文版）
• 年，卷（期）: 2021,（6）
• 所属期刊栏目: ADVANCED NANOMATERIALS FOR GAS AND HUMIDITY SENSORS
• 页码范围: 1651-1661
• 页数: 11页
• 语种: 英文

摘要

In this work,porous La1-xBaxFeO3 (x =0.01,0.02,0.03,0.04 and 0.05) microspheres of the orthorhombic perovskite phase were prepared by an envi-ronment-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 inhib-ited 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 La1-xBaxFeO3 sensor exhibits a fairy high response to the ethanol gas.In par-ticular,the La1-xBaxFeO3 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,demon-strating the superiority as an ethanol sensing nanomaterial.More importantly,the optimum operating temperature of La0.98Ba0.02FeO3 is only 200 ℃,while that of the pure LaFeO3 is 260 ℃.The Ba-doped porous microspheres prepared are a high-performance sensing material capable of rapid and accurate detection of ethanol.