The effect of electrolyte composition on the fabrication of self-organized titanium oxide nanotube arrays by anodic oxidation
The effect of electrolyte composition on the fabrication of self-organized titanium oxide nanotube arrays by anodic oxidation
复制标题
DOI：
10.1557/jmr.2005.0020
复制
发表时间：
2005-01-01
影响因子：
2.7
通讯作者：
Grimes, CA
中科院分区：
文献类型：
--
作者：
Cai, QY;Paulose, M;Grimes, CA
我们报道了在含有氟化钾（KF）或氟化钠（NaF）的电解质溶液中，通过阳极氧化纯钛片制备自组织的增强表面积的氧化钛纳米管阵列。详细讨论了电解质组成和浓度、溶液pH、阳极电位对纳米管的形成和纳米管尺寸的影响。虽然长度大于500纳米的纳米管阵列不可能与含有电解质的氢氟酸一起使用[G.K.more， O.K. Varghese， M. Paulose， N. Mukherjee， C.A. Grimes， J. Mater。Res. 18, 2588(2003)]，通过使用硫酸、氢氧化钠、硫酸钠和/或柠檬酸等添加剂将含有电解质的KF的pH值调整到4.5，我们可以将纳米管阵列的长度增加到大约4.4 μ m，长度增加了一个数量级。制备的纳米管由无定形氧化钛组成。与电解质组成无关，纳米管到锐钛矿相的结晶发生在温度>= 280℃时，温度接近480℃时，在纳米管- ti衬底界面上形成金红石。纳米管壁的几何约束抑制了锐钛矿到金红石的转变。在高达580摄氏度的温度下，纳米管阵列结构不会发生崩解，其优异的结构和晶相稳定性使其在低温和高温应用中都具有广阔的前景。
We report on the fabrication of self-organized titanium oxide nanotube arrays of enhanced surface area prepared by anodic oxidation of a pure titanium sheet in electrolyte solutions containing potassium fluoride (KF) or sodium fluoride (NaF). The effects of electrolyte composition and concentration, solution pH, and the anodic potential on the formation of nanotubes and dimensions of the resulting nanotubes are detailed. Although nanotube arrays of length greater than 500 nm are not possible with hydrofluoric acid containing electrolytes [G.K. Mor, O.K. Varghese, M. Paulose, N. Mukherjee, C.A. Grimes, J. Mater. Res. 18, 2588 (2003)], by adjusting the pH of a KF containing electrolyte to 4.5 using additives such as sulfuric acid, sodium hydroxide, sodium hydrogen sulfate, and/or citric acid, we could increase the length of the nanotube-array to approximately 4.4 mu m, an order of magnitude increase in length. The as-prepared nanotubes are composed of amorphous titanium oxide. Independent of the electrolyte composition, crystallization of the nanotubes to anatase phase occurred at temperatures >= 280 degrees C. Rutile formation occurred at the nanotube-Ti substrate interface at temperatures near 480 degrees C. It appears geometry constraints imposed by the nanotube walls inhibit anatase to rutile transformation. No disintegration of the nanotube array structure is observed at temperatures as high as 580 degrees C. The excellent structural and crystal phase stability of these nanotubes make them promising for both low- and high-temperature applications.