Synthesis of mesoporous α-Fe<inf>2</inf>O<inf>3</inf> nanostructures for highly sensitive gas sensors and high capacity anode materials in lithium ion batteries

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Journal Article
Journal of Physical Chemistry C, 2010, 114 (44), pp. 18753 - 18761
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Mesoporous α-Fe2O3 materials were prepared in large quantity by the soft template synthesis method using the triblock copolymer surfactant F127 as the template. Nitrogen adsorption-desorption isothermal measurements and transmission electron microscope observation revealed that the as-prepared mesoporous α-Fe2O3 nanostructures have large mesopores in a wide size range of 5-30 nm. It has been found that the Morin transition depends on thermal history of mesoporous α-Fe2O3, which is driven by surface anisotropy. Superparamagnetic behavior of mesoporous α-Fe2O3 is also associated with surface spins with blocking temperature around 50 K. When applied as gas sensors, mesoporous α-Fe2O3 nanostructures exhibited high gas sensitivity toward acetic acid and ethanol gas. As anodes in lithium ion cells, mesoporous α-Fe2O 3 materials show a high specific capacity of 1360 mAh/g with excellent cycling stability and high rate capacity. © 2010 American Chemical Society.
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