Topotactic Reduction Yielding Black Titanium Oxide Nanostructures as Metallic Electronic Conductors

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• 作者：Satoshi Tominaka
• 刊名：Inorganic Chemistry
• 出版年：2012
• 出版时间：October 1, 2012
• 年：2012
• 卷：51
• 期：19
• 页码：10136-10140
• 全文大小：348K
• 年卷期：v.51,no.19(October 1, 2012)
• ISSN：1520-510X

文摘

Detailed analyses of reduced, single crystal, rutile-type TiO₂ via high-resolution transmission electron microscopy (TEM) are reported which reveal that the reduction proceeds topotactically via interstitial diffusion of Ti ions at low temperature, around 350 掳C. This important finding encouraged the production of various nanostructured reduced titanium oxides from TiO₂ precursors with morphology retention, and in the process, the synthesis of black titanium oxide nanorods using TiO₂ nanorods was demonstrated. Interestingly, as opposed to the semiconductive behavior of Ti₂O₃ synthesized at high temperature, topotactically synthesized Ti₂O₃ exhibits metallic electrical resistance, and the value at room temperature is quite low (<6 渭惟 m, comparable to graphite). These unique properties are probably due to the lattice strains generally observed for topotactically synthesized Ti₂O₃. This work shows that topotactically reduced titanium oxides can have fascinating properties as well as nanostructures.