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Photo-induced effects on self-organized TiO2 nanotube arrays: the influence of surface morphology

机译：自组织TiO2纳米管阵列上的光诱导效应：表面形态的影响

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摘要

Self-organized TiO2 nanotubes with packed, vertically aligned morphology and different lateral characteristics were grown on Ti metal substrates by controlled electrochemical anodization in phosphate/HF and ethylene glycol/HF electrolytes. The wetting, photo-induced superhydrophilicity, and photocatalytic activity of the nanotubular materials were investigated under ultraviolet irradiation. The photoactivity of the TiO2 nanotube arrays was analysed in terms of their morphological characteristics that were determined by means of scanning electron microscopy and atomic force microscopy in conjunction with geometrical modelling. The wetting and the UV-induced superhydrophilicity could be accordingly modelled by the Cassie-Baxter mode arising from the large scale roughness of the nanotubular arrays in combination with the Wenzel mode due to the small scale roughness induced by ridges at the outer tube surface. The photocatalytic activity of the TiO2 nanotube arrays was further found to correlate quantitatively with the variation of the geometric roughness factor, verifying the strong impact of morphology on the photo-induced properties of the vertically oriented TiO2 tubular architecture.
机译：通过在磷酸盐/ HF和乙二醇/ HF电解质中进行受控的阳极氧化，在Ti金属基底上生长具有堆积，垂直排列的形态和不同横向特征的自组织TiO2纳米管。在紫外线照射下研究了纳米管材料的润湿性，光诱导的超亲水性和光催化活性。根据其形态特征分析了TiO 2纳米管阵列的光活性，所述形态特征是通过扫描电子显微镜和原子力显微镜结合几何模型确定的。湿润和紫外线诱导的超亲水性可通过卡西-巴克斯特模式进行建模，该模式是由纳米管阵列的大尺度粗糙度与温泽尔模式相结合而产生的，这归因于外管表面的脊所引起的小尺度粗糙度。进一步发现，TiO 2纳米管阵列的光催化活性与几何粗糙度因子的变化定量相关，证实了形态学对垂直取向的TiO 2管状结构的光诱导性能的强烈影响。

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