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Nanoscaffold WO3 by Kinetically Controlled Polymorphism

机译:纳米岛WO3通过动力学控制多态性

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摘要

Several metastable polymorphs, diverse crystal structures with the same chemical formula, could be accessed through epitaxial interfaces with low energy between epitaxial film and symmetry-matched substrates. Here, we fabricated tungsten oxide (WO3) nanoscaffolds composed of hexagonal WO3 (h-WO3)/monoclinic WO3 (m-WO3) polymorphs, and modulated the proportions of these phases by tuning the W arrival rate during epitaxial growth. The WO3 nanoscaffold is vertically aligned with coherent interphase boundaries between h-WO3 and m-WO3; this structure leads to the persistence of h-WO3 despite its metastable characteristic. The coherent interphase boundaries give rise to the unexpected six-fold m-WO3 phases and a distinct lattice response with intercalated hydrogen defects. This WO3 nanoscaffold with different fractions of two polymorphs would be a good model system to systematically study intercalation chemistry and its application with WO3 polymorphs.
机译:通过外延界面可以通过外延膜和对称匹配的基板之间的具有低能量的外延界面来进入几种稳定化的多晶型物,具有相同的化学式。 这里,我们制造了由六边形WO3(H-WO3)/单斜晶型WO3(M-WO3)多晶型物组成的氧化钨(WO3)纳米支导,并通过调节外延生长期间的W到达率来调节这些相的比例。 WO3纳米支导与H-WO3和M-WO3之间的相干性间隔垂直对齐; 尽管其稳定性特征,但这种结构导致H-WO3的持久性。 相干的间隔边界产生意外的六倍M-WO3相和与插层氢缺陷的不同晶格反应。 该WO3纳米烃具有不同级分的两种多晶型物将是一个良好的模型系统,以系统地研究嵌入化学及其与WO3多晶型物的应用。

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  • 来源
    《Crystal growth & design》 |2019年第1期|共8页
  • 作者单位

    Pohang Univ Sci &

    Technol POSTECH Dept Mat Sci &

    Engn Pohang 37673 South Korea;

    Pohang Univ Sci &

    Technol POSTECH Dept Mat Sci &

    Engn Pohang 37673 South Korea;

    Pohang Univ Sci &

    Technol POSTECH Dept Mat Sci &

    Engn Pohang 37673 South Korea;

    Pohang Univ Sci &

    Technol POSTECH Dept Mat Sci &

    Engn Pohang 37673 South Korea;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 晶体学;
  • 关键词

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