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The role of viscous flow of oxide in the growth of self-ordered porous anodic alumina films

机译：氧化物粘性流在自排序多孔阳极氧化铝膜生长中的作用

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摘要

Porous anodic alumina (PAA) films are widely used as templates for functional nanostructures, because of the high regularity and controllability of the pore morphology. However, growth mechanisms have not yet been developed that can explain quantitative relationships between processing conditions and oxide layer geometry. Here, we present a model for steady-state growth of these amorphous films, incorporating the novel feature that metal and oxygen ions are transported by coupled electrical migration and viscous flow. The oxide flow in the model arises near the film-solution interface at the pore bottoms, in response to the constraint of volume conservation. The hypothesis of viscous flow was successfully validated through detailed comparisons to observations of the motion of tungsten tracers in the film. Predictions of localized tensile stress near nanoscale ridges at the metal-film interface were supported by observations of voids at these sites. We suggest that the ordering of PAA may be explained by a mechanism in which metal-film interface motion is regulated by the combination of ionic migration in the oxide and stress-driven interface diffusion of metal atoms.
机译：多孔阳极氧化铝（PAA）膜由于孔形态的规则性和可控性高而被广泛用作功能纳米结构的模板。然而，尚未开发出可以解释加工条件与氧化物层几何形状之间的定量关系的生长机理。在这里，我们提出了这些非晶膜稳态生长的模型，并结合了新颖的特征，即金属和氧离子通过耦合的电迁移和粘性流传输。响应于体积守恒的约束，模型中的氧化物流出现在孔底部的膜-溶液界面附近。通过详细比较薄膜中钨示踪剂运动的观察结果，成功地验证了粘性流动的假设。在这些位置观察到的空隙支持了在金属膜界面纳米尺度脊附近的局部拉伸应力的预测。我们建议，PAA的排序可以通过一种机制来解释，其中金属膜界面运动受氧化物中的离子迁移与金属原子的应力驱动界面扩散的结合所调节。

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  • 来源
    《Nature Materials》 |2009年第5期|415-420|共6页
  • 作者

    Jerrod E. Houser; Kurt R. Hebert;

  • 作者单位

    Department of Chemical and Biological Engineering, Iowa State University, Ames, Iowa 50011, USA;

    Department of Chemical and Biological Engineering, Iowa State University, Ames, Iowa 50011, USA;

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