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Effects of geometric and crystal structures on the photoelectrical properties of highly ordered TiO_2 nanotube arrays

机译：几何和晶体结构对高阶TiO_2纳米管阵列光电性能的影响

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摘要

The photoelectrical properties of highly ordered TiO_2 nanotube (TNT) arrays have been systematically and quantitatively studied and found to be closely related to their geometric and crystal structures. The geometric characteristics, including the nanotube diameter and length, were modified by adjusting the anodization potentials and durations, while the crystal structure was modified by thermal annealing at different temperatures. The nanotube array samples with the mixed crystalline phases possess higher photoconversion efficiency than those with the single anatase or rutile phase. The optimal content of rutile phase is about twice of that of anatase phase. In terms of the influence of the geometric structure, the TNT arrays with larger inner diameters and longer tube lengths have better photoelectrical properties. A geometric roughness factor has been applied to describe the combinative effect of the geometric characteristics. The TNT sample with the geometric roughness factor of 125.32 shows the superior photoconversion efficiency of 13.2%. The underlying mechanism has also been discussed in detail.
机译：系统地和定量地研究了高度有序的TiO_2纳米管（TNT）阵列的光电性能，并发现其与几何和晶体结构密切相关。通过调节阳极氧化电势和持续时间可以改变包括纳米管直径和长度在内的几何特征，而通过在不同温度下进行热退火可以改变晶体结构。具有混合结晶相的纳米管阵列样品具有比具有单一锐钛矿或金红石相的纳米管阵列样品更高的光转换效率。金红石相的最佳含量约为锐钛矿相的两倍。就几何结构的影响而言，具有更大内径和更长管长的TNT阵列具有更好的光电性能。几何粗糙度因子已用于描述几何特征的组合效果。几何粗糙度系数为125.32的TNT样品显示出13.2％的优异光转换效率。潜在的机制也已被详细讨论。

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  • 来源
    《Journal of Materials Research》 |2012年第7期|p.1029-1036|共8页
  • 作者

    Danhong Li; Shiwei Lin; Shipu Li; Xiang Huang; Xiankun Cao; Jianbao Li;

  • 作者单位

    Key Laboratory of Ministry of Education for Application Technology of Chemical Materials in Hainan Superior Resources, School of Materials and Chemical Engineering, Hainan University, Haikou 570228, People's Republic of China;

    Key Laboratory of Ministry of Education for Application Technology of Chemical Materials in Hainan Superior Resources, School of Materials and Chemical Engineering, Hainan University, Haikou 570228, People's Republic of China;

    Key Laboratory of Ministry of Education for Application Technology of Chemical Materials in Hainan Superior Resources, School of Materials and Chemical Engineering, Hainan University, Haikou 570228, People's Republic of China;

    Key Laboratory of Ministry of Education for Application Technology of Chemical Materials in Hainan Superior Resources, School of Materials and Chemical Engineering, Hainan University, Haikou 570228, People's Republic of China;

    Key Laboratory of Ministry of Education for Application Technology of Chemical Materials in Hainan Superior Resources, School of Materials and Chemical Engineering, Hainan University, Haikou 570228, People's Republic of China;

    Key Laboratory of Ministry of Education for Application Technology of Chemical Materials in Hainan Superior Resources, School of Materials and Chemical Engineering, Hainan University, Haikou 570228, People's Republic of China;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);
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