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Morphological evolution of TiO_2 nanotube arrays with lotus-root-shaped nanostructure

机译：莲lotus状纳米结构TiO_2纳米管阵列的形貌演变

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摘要

TiO_2 nanotube arrays (TNAs) with lotus-root-shaped nanostructure have been fabricated by a modified two-step electrochemical anodization method. In the present work, different morphologies formed under different anodizing voltages are investigated in detail by field-emission scanning electron microscope. The results show that the concaves left by the first-step anodization can guide the uniform growth of TNAs in some degree as the second-step anodizing voltage is the same with that in the first step, however, when lower voltages are adopted in the second-step anodization, no guidance can be achieved, and different morphological TNAs with lotus-root-shaped nanostructure are fabricated. And we find that the nanotube diameters are directly proportional to the applied voltage in the second-step anodization. Furthermore, a possible mechanism for the growth of the TiO_2 nanotubes with the special morphology is proposed for the first time, which depends on both the oxygen bubble mold and the viscous flow of the barrier oxide from the pore base to the pore wall.
机译：采用改进的两步电化学阳极氧化法制备了具有莲lotus状纳米结构的TiO_2纳米管阵列。在本工作中，通过场发射扫描电子显微镜详细研究了在不同阳极氧化电压下形成的不同形态。结果表明，第一步阳极氧化留下的凹痕可以在一定程度上指导TNA的均匀生长，因为第二步阳极氧化电压与第一步相同，但是当第二步采用较低的电压时一步阳极氧化，无法获得指导，并制造了具有莲lotus状纳米结构的不同形态的TNA。并且我们发现，纳米管的直径与第二步阳极氧化过程中施加的电压成正比。此外，首次提出了生长具有特殊形态的TiO_2纳米管的可能机理，该机理取决于氧气气泡模和阻隔氧化物从孔底到孔壁的粘性流动。

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  • 来源
    《Applied Surface Science》 |2013年第1期|711-716|共6页
  • 作者

    Dongliang Yu; Ye Song; Xufei Zhu; Ruiquan Yang; Aijun Han;

  • 作者单位

    Key Laboratory of Soft Chemistry and Functional Materials of Education Ministry, Nanjing University of Science and Technology, Nanjing 210094, People's Republic of China;

    Key Laboratory of Soft Chemistry and Functional Materials of Education Ministry, Nanjing University of Science and Technology, Nanjing 210094, People's Republic of China;

    Key Laboratory of Soft Chemistry and Functional Materials of Education Ministry, Nanjing University of Science and Technology, Nanjing 210094, People's Republic of China;

    Key Laboratory of Soft Chemistry and Functional Materials of Education Ministry, Nanjing University of Science and Technology, Nanjing 210094, People's Republic of China;

    Key Laboratory of Soft Chemistry and Functional Materials of Education Ministry, Nanjing University of Science and Technology, Nanjing 210094, People's Republic of China;

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  • 原文格式 PDF
  • 正文语种 eng
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  • 关键词

    TiO_2 nanotube; Anodization; Oxygen bubble mold; Formation mechanism;

    机译：TiO_2纳米管;阳极氧化;氧气气泡模具;形成机理;

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