Fe2O3/TiO2 Tube-like Nanostructures: Synthesis, Structural Transformation and the Enhanced Sensing Properties

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• 作者：Chun-Ling Zhu ; Hai-Long Yu ; Yue Zhang ; Tie-Shi Wang ; Qiu-Yun Ouyang ; Li-Hong Qi ; Yu-Jin Chen ; Xin-Yu Xue
• 刊名：ACS Applied Materials & Interfaces
• 出版年：2012
• 出版时间：February 22, 2012
• 年：2012
• 卷：4
• 期：2
• 页码：665-671
• 全文大小：448K
• 年卷期：v.4,no.2(February 22, 2012)
• ISSN：1944-8252

文摘

The paper describes for the first time the successful synthesis of Fe₂O₃/TiO₂ tube-like nanostructures, in which TiO₂ shell is of quasi-single crystalline characteristic and its thickness can be controlled through adjusting the added amount of aqueous Ti(SO₄)₂ solution. The characterization of samples obtained at different stages using transmission electron microscope indicates that the outer TiO₂ shell is changed gradually from amorphous and polycrystalline phase into quasi-single crystal under thermal actions through the Ostwald ripening process, accompanying the corrosion of the central parts of Fe₂O₃ nanorods, and the formation of small particles separating each other, leading to the special core/shell nanorods. Furthermore, Fe₂O₃/TiO₂ tube-like nanostructures can be transformed into Fe₂TiO₅ nanostructures after they are thermally treated at higher temperatures. Those nanostructures exhibit enhanced ethanol sensing properties with respect to the monocomponent. Our results imply that not only hollow nanostructures, but also a novel type of nanostructures can be fabricated by the present method for nanodevices.

Keywords:

iron oxide; titanium dioxide; iron titanium oxide; gas sensing; hollow nanostructures; heterostructures