期刊
ACS NANO
卷 3, 期 5, 页码 1212-1218出版社
AMER CHEMICAL SOC
DOI: 10.1021/nn900084e
关键词
acid vapor oxidation; film; morphology; rutile; nanotree; wettability
类别
资金
- National Natural Science Foundation (NNSF) of China
- Government of Guangdong Province for NSF [U0734002, 50872158, 8251027501000010, 2006B14701002, 200713090400001]
- China Postdoctoral Science Foundation [20080440117]
- Chinese University of Hong Kong
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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