Nanostructure Transition on Anodic Titanium: Structure Control via a Competition Strategy between Electrochemical Oxidation and Chemical Etching

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• 作者：Shanshan Huang ; Wanting Peng ; Chengyun Ning ; Qing Hu ; Hua Dong
• 刊名：The Journal of Physical Chemistry C
• 出版年：2012
• 出版时间：October 25, 2012
• 年：2012
• 卷：116
• 期：42
• 页码：22359-22364
• 全文大小：331K
• 年卷期：v.116,no.42(October 25, 2012)
• ISSN：1932-7455

文摘

Synthesis of various nanostructures on anodic metals such as Al and Ti attracts much attention in recent years. In this paper, we investigate in detail the nanostructure transition on anodic Ti and put forward a novel physical model to systematically explain the formation mechanism and discuss the relevant influential factors. Our physical model reveals that the available nanostructures are dominated by a competition strategy between electrochemical oxidation and chemical etching reactions. Depending on the ratio of initial rates of these two reactions, four types of nanostructures including compact oxide layer, ordered TiO₂ nanotube/nanopore, ordered Ti nanorod/nanoflake, and disordered Ti nanostructure can be obtained. To verify this physical model, we fabricate various nanostructures via controlling the influential factors of the reaction rates, and the resulting morphologies are in good agreement with the physical model. This also answers the question why the totally different self-organized 1D nanostructure (TiO₂ nanotube and Ti nanorod) can be synthesized under similar conditions.