Efficient Room-Temperature Conversion of Anatase to Rutile TiO2 Induced by High-Spin Ion Doping
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- 作者：James L. Gole ; Sharka M. Prokes ; Orest J. Glembocki
- 刊名：Journal of Physical Chemistry C
- 出版年：2008
- 出版时间：February 14, 2008
- 年：2008
- 卷：112
- 期：6
- 页码：1782 - 1788
- 全文大小：357K
- 年卷期：v.112,no.6(February 14, 2008)
- ISSN：1932-7455
文摘
The surprising room-temperature phase conversion of anatase to rutile TiO2, a process that normally requirestemperatures well in excess of 700 
C, is facilitated through the use of transition metal ions with highlyunpaired electron spin. Raman spectroscopy is used to demonstrate this unexpected process, facilitated throughthe use of high-spin cobalt (CoII) and nickel (NiII) transition metal ion seeding into a TiO2 or TiO2-xNxnanocolloid lattice. In distinct contrast, the effect is not manifest upon seeding with low-spin ions includingCuII. The Raman spectra also demonstrate the concomitant incorporation of a spinel-like structure into thetitania lattice, which is suggested to influence the high-spin cobalt interaction.
C, is facilitated through the use of transition metal ions with highlyunpaired electron spin. Raman spectroscopy is used to demonstrate this unexpected process, facilitated throughthe use of high-spin cobalt (CoII) and nickel (NiII) transition metal ion seeding into a TiO2 or TiO2-xNxnanocolloid lattice. In distinct contrast, the effect is not manifest upon seeding with low-spin ions includingCuII. The Raman spectra also demonstrate the concomitant incorporation of a spinel-like structure into thetitania lattice, which is suggested to influence the high-spin cobalt interaction.