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首页> 外文期刊>Advanced Functional Materials >Tailoring of La_xSr(1_x)Co_yFe_(1_y)O_(3_δ) Nanostructure by Pulsed Laser Deposition
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Tailoring of La_xSr(1_x)Co_yFe_(1_y)O_(3_δ) Nanostructure by Pulsed Laser Deposition

机译：通过脉冲激光沉积定制La_xSr（1_x）Co_yFe_（1_y）O_（3_δ）纳米结构

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摘要

Pulsed Laser Deposition (PLD) was used to prepare thin films with the nominal composition La_(0.58)Sr_(0.4)Co_(0.2)Fe_(0.8)O_(3-δ) (LSCF). The thin film micro-structure was investigated as a function of PLD deposition parameters such as: substrate temperature, ambient gas pressure, target-to-substrate distance, laser fluence and frequency. It was found that the ambient gas pressure and the substrate temperature are the key PLD process parameters determining the thin film micro- and nanostructure. A map of the LSCF film nanostruc-tures is presented as a function of substrate temperature (25-700 ℃) and oxygen background pressure (0.013-0.4 mbar), with film structures ranging from fully dense to highly porous. Fully crystalline, dense, and crack-free LSCF films with a thickness of 300 nm were obtained at an oxygen pressure lower than 0.13 mbar at a temperature of 600 ℃. The obtained knowledge on the structure allows for tailoring of perovskite thin film nanostructure, e.g., for solid oxide fuel cell cathodes. A simple geometrical model is proposed, allowing estimation of the catalytic active surface area of the prepared thin films. It is shown that voids at columnar grain boundaries can result in an increase of the surface area by approximately 25 times, when compared to dense flat films.
机译：使用脉冲激光沉积（PLD）制备标称成分为La_（0.58）Sr_（0.4）Co_（0.2）Fe_（0.8）O_（3-δ）（LSCF）的薄膜。研究了薄膜微结构作为PLD沉积参数的函数，这些参数包括：衬底温度，环境气压，靶到衬底的距离，激光通量和频率。发现环境气压和衬底温度是决定薄膜微结构和纳米结构的关键PLD工艺参数。 LSCF薄膜纳米结构的图谱是底物温度（25-700℃）和氧气背景压力（0.013-0.4 mbar）的函数，薄膜结构的范围从完全致密到高度多孔。在氧气压力低于0.13毫巴，温度为600℃的情况下，获得了厚度为300 nm的全结晶，致密且无裂纹的LSCF膜。所获得的关于结构的知识允许定制钙钛矿薄膜纳米结构，例如用于固体氧化物燃料电池阴极。提出了一个简单的几何模型，可以估算所制备薄膜的催化活性表面积。结果表明，与致密的平面膜相比，柱状晶界处的空隙可导致表面积增加约25倍。

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  • 来源
    《Advanced Functional Materials》 |2011年第14期|p.2764-2775|共12页
  • 作者

    Pawel Plonczak; Anja Bieberle-Huetter; Martin Sogaard; Thomas Ryll; Julia Martynczuk; Peter Vang Hendriksen; LudwigJ. Cauckler;

  • 作者单位

    Fuel Cell and Solid State Chemistry Division Riso National Laboratory-Technical University of Denmark Frederiksborgvej 399, 4000 Roskilde, Denmark;

    Nonmetallic Inorganic Materials ETH Zurich, Wolfgang-Pauli-Str. 10 CH-8093 Zurich, Switzerland;

    Fuel Cell and Solid State Chemistry Division Riso National Laboratory-Technical University of Denmark Frederiksborgvej 399, 4000 Roskilde, Denmark;

    Nonmetallic Inorganic Materials ETH Zurich, Wolfgang-Pauli-Str. 10 CH-8093 Zurich, Switzerland;

    Nonmetallic Inorganic Materials ETH Zurich, Wolfgang-Pauli-Str. 10 CH-8093 Zurich, Switzerland;

    Fuel Cell and Solid State Chemistry Division Riso National Laboratory-Technical University of Denmark Frederiksborgvej 399, 4000 Roskilde, Denmark;

    Nonmetallic Inorganic Materials ETH Zurich, Wolfgang-Pauli-Str. 10 CH-8093 Zurich, Switzerland;

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