Fabrication of highly ordered TiO2 nanorod/nanotube adjacent arrays for photoelectrochemical applications.
Fabrication of highly ordered TiO2 nanorod/nanotube adjacent arrays for photoelectrochemical applications.
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DOI：
10.1021/la1005314
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发表时间：
2010-04
期刊：
影响因子：
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通讯作者：
Haimin Zhang;Porun Liu;Xiaolu Liu;Shanqing Zhang;X. Yao;T. An;R. Amal;Huijun Zhao
中科院分区：
文献类型：
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作者：
Haimin Zhang;Porun Liu;Xiaolu Liu;Shanqing Zhang;X. Yao;T. An;R. Amal;Huijun Zhao
这项工作报告了一种通过直接阳极氧化改性钛箔来制造垂直排列和高度有序的 TiO(2) 纳米棒/纳米管 (NR/NT) 相邻薄膜的简便方法。通过在0.05 M (NH(4))(2)S(2)O(8) 中水热工艺对钛箔基材进行一层结晶TiO(2) 薄膜的改性。由此产生的 NR/NT 架构由高度有序的纳米棒顶层组成，该顶层直接毗邻高度有序的纳米管阵列底层。阳极氧化20分钟后，顶部纳米棒层的厚度约为90纳米，平均纳米棒直径为22纳米。发现底部纳米管阵列层的厚度约为。阳极氧化 20 分钟后为 250 nm，平均外管直径和内管直径分别为 120 和 80 nm。该方法的广泛含义是对基底表面的简单修饰可以产生新形式的纳米结构。对于阳极氧化的 NR/NT 样品，XRD 分析表明纳米棒为锐钛矿型 TiO(2) 晶态，而纳米管为非晶态。将阳极氧化样品在空气中于450℃热处理2h，可获得高结晶度的锐钛矿型TiO(2)晶型NR/NT薄膜。所得NR/NT膜用作光阳极以进行光活性评价。与直接阳极氧化未改性钛箔制备的纳米管阵列光阳极相比，NR/NT光阳极表现出对有机物选择性光催化氧化的独特特性，这使得它在光催化降解有机污染物、传感和其他应用方面非常有吸引力。
This work reports a facile approach to fabricate a perpendicularly aligned and highly ordered TiO(2) nanorod/nanotube (NR/NT) adjacent film by directly anodizing a modified titanium foil. The titanium foil substrate was modified with a layer of crystalline TiO(2) film via a hydrothermal process in 0.05 M (NH(4))(2)S(2)O(8). The resultant NR/NT architecture consists of a highly ordered nanorod top layer that directly adjoins to a highly ordered nanotube array bottom layer. The thickness of the top nanorod layer was approximately 90 nm with average nanorod diameter of 22 nm after 20 min of anodization. The thickness of the bottom nanotube array layer was found to be ca. 250 nm after 20 min of anodization, having an average outer and inner tubular diameters of 120 and 80 nm, respectively. A broad implication of the method is that a simple modification to the substrate surface can lead to new forms of nanostructures. For as-anodized NR/NT samples, XRD analysis reveals that the nanorods are of anatase TiO(2) crystalline form while the nanotubes are amorphous. Anatase TiO(2) crystalline form of NR/NT film with high crystallinity can be obtained by thermally treating the as-anodized sample at 450 degrees C for 2 h in air. The resultant NR/NT film was used as a photoanode for photoactivity evaluation. Comparing with a nanotube array photoanode prepared by direct anodization of unmodified titanium foil, the NR/NT photoanode exhibits a unique feature of selective photocatalytic oxidation toward organics, which makes it very attractive to photocatalytic degradation of organic pollutants, sensing, and other applications.