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Substrate-dependent structural and CO sensing properties of LaCoO_3 epitaxial films

机译：LaCoO_3外延膜的与基底有关的结构和CO感测特性

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摘要

LaCoO3 thin films were grown on different (0 0 1) oriented LaAlO3, SrTiO3 and (LaAlO3)(0.3)(Sr2AlTaO6)(0.7) by the polymer assisted deposition method, respectively. All the LaCoO3 thin films are in epitaxial growth on these substrates, with tetragonal distortion of CoO6 octahedrons. Due to different in-plane lattice mismatch, the LaCoO3 film on LaAlO3 has the largest tetragonal distortion of CoO6 octahedrons while the film grown on (LaAlO3)(0.3)(Sr2AlTaO6)(0.7) has the smallest tetragonal distortion. The relative contents of the surface absorbed oxygen species are found to increase for the LaCoO3 epitaxial films grown on (0 0 1) oriented (LaAlO3)(0.3)(Sr2AlTaO6)(0.7), SrTiO3 and LaAlO3 substrates, sequentially. The film sensors exhibit good CO sensing properties at 150 degrees C, and the LaCoO3 film on LaAlO3 shows the highest response but the film on (LaAlO3)(0.3)(Sr2AlTaO6)(0.7) shows the lowest. It reveals that the larger degree of Jahn-Teller-like tetragonal distortion of CoO6 octahedrons may greatly improve the surface absorbing and catalytic abilities, corresponding to more excellent CO sensing performance. The present study suggests that the formation of epitaxial films is an efficient methodology for controlling the octahedral distortion and thereby improving the gas sensing performance of perovskite transition metal oxides. (C) 2018 Elsevier B.V. All rights reserved.
机译：通过聚合物辅助沉积法分别在（0 0 1）取向的LaAlO3，SrTiO3和（LaAlO3）（0.3）（Sr2AlTaO6）（0.7）上生长LaCoO3薄膜。所有的LaCoO3薄膜都在这些衬底上外延生长，并且CoO6八面体呈四边形形变。由于不同的面内晶格失配，LaAlO3上的LaCoO3薄膜具有最大的CoO6八面体四方形畸变，而在（LaAlO3）（0.3）（Sr2AlTaO6）（0.7）上生长的膜具有最小的四方形畸变。发现在（0 0 1）取向（LaAlO3）（0.3）（Sr2AlTaO6）（0.7），SrTiO3和LaAlO3衬底上依次生长的LaCoO3外延膜，表面吸收的氧种类的相对含量增加。薄膜传感器在150摄氏度时表现出良好的CO感测性能，LaAlO3上的LaCoO3薄膜显示最高的响应，而（LaAlO3）（0.3）（Sr2AlTaO6）（0.7）上的薄膜显示最低。结果表明，较大程度的CoO6八面体的Jahn-Teller型四边形畸变可以极大地改善表面吸收和催化能力，从而具有更优异的CO感测性能。本研究表明，外延膜的形成是控制八面体形变，从而改善钙钛矿过渡金属氧化物的气敏性能的有效方法。 （C）2018 Elsevier B.V.保留所有权利。

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  • 来源
    《Applied Surface Science》 |2018年第1期|742-749|共8页
  • 作者

    Liu Haifeng; Sun Hongjuan; Xie Ruishi; Zhang Xingquan; Zheng Kui; Peng Tongjiang; Wu Xiaoyu; Zhang Yanping;

  • 作者单位

    Southwest Univ Sci & Technol, Analyt & Testing Ctr, Mianyang 621010, Peoples R China;

    Southwest Univ Sci & Technol, Inst Mineral Mat & Applicat, Mianyang 621010, Peoples R China;

    Southwest Univ Sci & Technol, Analyt & Testing Ctr, Mianyang 621010, Peoples R China;

    Southwest Univ Sci & Technol, Analyt & Testing Ctr, Mianyang 621010, Peoples R China;

    Southwest Univ Sci & Technol, Analyt & Testing Ctr, Mianyang 621010, Peoples R China;

    Southwest Univ Sci & Technol, Inst Mineral Mat & Applicat, Mianyang 621010, Peoples R China;

    Southwest Univ Sci & Technol, Acad Lib, Mianyang 621010, Peoples R China;

    Southwest Univ Sci & Technol, Analyt & Testing Ctr, Mianyang 621010, Peoples R China;

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  • 正文语种 eng
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  • 关键词

    LaCoO3; Epitaxial films; Tetragonal distortion; CO; Sensors;

    机译：LaCoO3;外延膜;四方畸变;CO;传感器;

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