Effect of synthesis route on electrical and ethanol sensing characteristics for LaFeO3-δ nanoparticles by citric sol-gel method
Effect of synthesis route on electrical and ethanol sensing characteristics for LaFeO3-δ nanoparticles by citric sol-gel method
复制标题
柠檬酸溶胶-凝胶法合成路线对 LaFeO3-δ 纳米粒子电学和乙醇传感特性的影响
DOI：
10.1016/j.apsusc.2016.10.013
复制
发表时间：
2017-01-30
影响因子：
6.7
通讯作者：
Deng, Xiao
中科院分区：
文献类型：
--
作者：
Cao, Ensi;Yang, Yuqing;Deng, Xiao
采用柠檬酸溶胶-凝胶法，通过不同的原料选择和焙烧工艺制备了LaFeO_3-Delta纳米粒子。选择聚乙二醇代替乙二醇作原料，添加400℃预焙烧而不是600℃直接预焙烧，由于活化能Ea降低，导致电阻降低，同时，选择乙二醇作原料，增加预焙烧，提高了对乙醇的敏感性。综合灵敏度分析和X射线衍射仪、扫描电子显微镜、透射电子显微镜、X射线光电子能谱分析结果表明，LaFeO_3-(Delta)的传感性能主要取决于Fe离子表面吸附的氧物种，并有一定的天然活性氧的贡献。在112℃的最佳工作温度下，乙二醇制得的样品具有46.1-200ppm乙醇的最佳灵敏度，这是由于其颗粒大小均匀、分散性好以及表面区Fe/La原子比高所致。(C)2016爱思唯尔B.V.保留所有权利。
LaFeO3-delta nanoparticles were prepared by citric sol-gel method with different raw material choosing and calcination process. The choosing of polyethylene glycol instead of ethylene glycol as raw material and additional pre-calcination at 400 degrees C rather than direct calcination at 600 degrees C could result in the decrease of resistance due to the reduction of activation energy Ea, Meanwhile, the choosing of ethylene glycol as raw material and additional pre-calcination leads to the enhancement of sensitivity to ethanol. Comprehensive analysis on the sensitivity and XRD, SEM, TEM, XPS results indicates that the sensing performance of LaFeO3-(delta) should be mainly determined by the adsorbed oxygen species on Fe ions, with certain contribution from native active oxygen. The best sensitivity of 46.1-200 ppm ethanol at prime working temperature of 112 degrees C is obtained by the sample using ethylene glycol as raw material with additional pre-calcination, which originates from its uniformly-sized and well-dispersed particles as well as high atomic ratio of Fe/La at surface region. (C) 2016 Elsevier B.V. All rights reserved.