TiO2 nanotube arrays for photocatalysis: Effects of crystallinity, local order, and electronic structure
TiO2 nanotube arrays for photocatalysis: Effects of crystallinity, local order, and electronic structure
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DOI：
10.1116/1.4902350
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发表时间：
2015-03
期刊：
影响因子：
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通讯作者：
Jing Liu;P. M. Hosseinpour;S. Luo;D. Heiman;L. Menon;D. Arena;L. H. Lewis
中科院分区：
文献类型：
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作者：
Jing Liu;P. M. Hosseinpour;S. Luo;D. Heiman;L. Menon;D. Arena;L. H. Lewis
为了深入了解电子和局部结构以及光活性的相关性，通过对钛箔进行电化学阳极氧化，然后在 O2（氧化）、Ar（惰性）和 H2（还原）环境中进行热处理，合成了短和长 TiO2 纳米管阵列。通过 X 射线衍射、扫描电子显微镜和基于同步加速器的 X 射线吸收光谱来探测这些纳米管的物理和电子结构，并与其光催化性能相关联。通过监测紫外-可见光照射下甲基橙的降解来评估纳米管的光催化活性。结果表明，在 350 °C 退火后，所有阳极氧化非晶 TiO2 纳米管样品部分转变为锐钛矿结构，结晶度和纳米管表面 (∼5 nm) 附近的局部缺陷浓度根据退火条件而变化。对于阳极氧化的样品，未检测到甲基橙的降解...
To furnish insight into correlations of electronic and local structure and photoactivity, arrays of short and long TiO2 nanotubes were synthesized by electrochemical anodization of Ti foil, followed by thermal treatment in O2 (oxidizing), Ar (inert), and H2 (reducing) environments. The physical and electronic structures of these nanotubes were probed with x-ray diffraction, scanning electron microscopy, and synchrotron-based x-ray absorption spectroscopy, and correlated with their photocatalytic properties. The photocatalytic activity of the nanotubes was evaluated by monitoring the degradation of methyl orange under UV-VIS light irradiation. Results show that upon annealing at 350 °C all as-anodized amorphous TiO2 nanotube samples partially transform to the anatase structure, with variations in the degree of crystallinity and in the concentration of local defects near the nanotubes' surface (∼5 nm) depending on the annealing conditions. Degradation of methyl orange was not detectable for the as-anodized ...