School of Mechanical and Aerospace Engineering, Nanyang Technological University, 50 Nanyang Avenue, Singapore 639798, Singapore.
Langmuir. 2010 Dec 7;26(23):18424-9. doi: 10.1021/la103390s. Epub 2010 Nov 4.
In the past decade, the pore diameter of anodic titania nanotubes was reported to be influenced by a number of factors in organic electrolyte, for example, applied potential, working distance, water content, and temperature. All these were closely related to potential drop in the organic electrolyte. In this work, the essential role of electric field originating from the potential drop was directly revealed for the first time using a simple two-electrode anodizing method. Anodic titania nanotube arrays were grown simultaneously at both sides of a titanium foil, with tube length being longer at the front side than that at the back side. This lopsided growth was attributed to the higher ionic flux induced by electric field at the front side. Accordingly, the nanotube length was further tailored to be comparable at both sides by modulating the electric field. These results are promising to be used in parallel configuration dye-sensitized solar cells, water splitting, and gas sensors, as a result of high surface area produced by the double-sided architecture.
在过去的十年中，研究人员发现阳极氧化钛纳米管的孔径受有机电解液中多种因素的影响，例如施加的电势、工作距离、含水量和温度。所有这些都与有机电解液中的电势降密切相关。在这项工作中，首次使用简单的两电极阳极氧化法直接揭示了源自电势降的电场的重要作用。钛箔的两侧同时生长阳极氧化钛纳米管阵列，前侧的管长比后侧长。这种不对称生长归因于前侧电场引起的更高离子通量。因此，通过调节电场，将纳米管长度进一步调整为两侧可比。这些结果有望用于平行配置的染料敏化太阳能电池、水分解和气体传感器，因为双面结构产生了高表面积。
