Preparation and properties of magnetic iron oxide nanotubes_中国颗粒学会

Preparation and properties of magnetic iron oxide nanotubes_中国颗粒学会

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Partic. vol. 6 no. 5 pp. 334-339 (October 2008)
doi: 10.1016/j.partic.2008.04.006

Preparation and properties of magnetic iron oxide nanotubes

Baoliang Lv^{a, b}, Yao Xu^{a, *}, Dong Wu^a, Yuhan Sun^a

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xuyao@sxicc.ac.cn

Abstract

Magnetite (Fe₃O₄) nanotubes were prepared by reducing synthesized hematite (α-Fe₂O₃) nanotubes in 5% H₂+95% Ar atmosphere, and then maghemite (γ-Fe₂O₃) nanotubes were obtained by re-oxidizing the Fe₃O₄ nanotubes. The nanotube structure was kept from collapsing or sintering throughout the high temperature reducing and re-oxidizing processes. The coercivities of the Fe₃O₄ and γ-Fe₂O₃ nanotubes synthesized were found to be 340.22 Oe and 342.23 Oe, respectively, both higher than other nanostructures with the same phase and of similar size. Both adsorbed phosphate and the nanotube structure are considered responsible for this high coercivity.

Keywords

Nanostructures; Iron oxides; Nanotubes; Magnetic properties