Hierarchically Nanostructured Rutile Arrays: Acid Vapor Oxidation Growth and Tunable Morphologies

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MOE Key Laboratory of Bioinorganic and Synthetic Chemistry, School of Chemistry and Chemical Engineering, State Key Laboratory of Optoelectronic Materials and Technologies, School of Physics and Engineering, Instrumental Analysis and Research Centre, Sun Yat-Sen (Zhongshan) University, Guangzhou, 510275, P. R. China
Department of Chemistry, Centre of Novel Functional Molecules, The Chinese University of Hong Kong, Shatin, Hong Kong, P. R. China
* Address correspondence to [email protected], [email protected]
Cite this: ACS Nano 2009, 3, 5, 1212–1218
Publication Date (Web):April 28, 2009
Copyright © 2009 American Chemical Society
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A general acid vapor oxidation (AVO) strategy has been developed to grow highly oriented hierarchically structured rutile TiO2 nanoarrays with tunable morphologies from titanium thin films. This is a simple one-pot synthesis approach involving the reaction of a titanium surface with the vapor generated from a hydrochloric acid solution in a Teflon lined autoclave. To the best of our knowledge, this is the first successful attempt to grow ordered tree-like titania nanoarrays. A possible formation mechanism for the interesting architectures has been proposed based on series of time-dependent experiments. By adjusting the initial HCl concentration, films of different rutile structures including nanotrees, dendritic nanobundles, and nanorods can be selectively obtained. Subsequently, the surface morphologies and wettability can be readily tuned.

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