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The influence of hydroxide on the initial stages of anodic growth of TiO_2 nanotubular arrays

机译：氢氧化物对TiO_2纳米管阵列阳极生长初期的影响

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Understanding the mechanism for growing TiO_2 nanotubes is important for controlling the nanostructures. The hydroxide nano-islands on the Ti surface play a significant role at the initial stage of anodization by forming the very first nano-pores at the interface between hydroxide islands and substrate and eliminating the H_2O electrolysis. A quantitative time dependent SEM study has revealed a nanotube growth process with an initial linear increase of pore diameter, film thickness and number of pores. During the anodization of titanium, different current transient curves are observed for Ti samples with or without hydroxide on the surface. The transient current profile has been quantitatively analyzed by fitting several distinctive stages based on a growth mechanism supported by SEM observations. It is found that a saturated cubic dependent equation is appropriate to fit a short current upturn due to the increase of the surface area.
机译：理解生长TiO_2纳米管的机理对于控制纳米结构很重要。 Ti表面的氢氧化物纳米岛在阳极氧化的初始阶段起着重要的作用，它通过在氢氧化物岛和基底之间的界面形成最先的纳米孔并消除H_2O电解。随时间变化的SEM研究表明，纳米管的生长过程具有孔径，膜厚和孔数线性增加的初始过程。在钛的阳极氧化过程中，观察到表面上有或没有氢氧化物的Ti样品具有不同的电流瞬态曲线。瞬态电流分布图已通过基于SEM观测值支持的生长机制拟合几个不同的阶段进行了定量分析。已经发现，由于表面积的增加，饱和的立方相关方程适合于短时的电流上升。

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