Thermal Growth and Nanomagnetism of the Quasi-one Dimensional Iron Oxide

材料科学技术（英文）, 2011, 27(11): 985-990.

Thermal Growth and Nanomagnetism of the Quasi-one Dimensional Iron Oxide

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1.School of Materials Science and Engineering, South China University of Technology, Guangzhou 510640, China

2.School of Materials Science and Engineering, South China University of Technology, Guangzhou 510640, China

3.School of Materials Science and Engineering, South China University of Technology, Guangzhou 510640, China

4.School of Materials Science and Engineering, South China University of Technology, Guangzhou 510640, China

5.School of Materials Science and Engineering, South China University of Technology, Guangzhou 510640, China

基金项目: This work was supported by the Scientific Research Foundation for the Returned Overseas Chinese Scholars, State Education Ministry of China, the Natural Science Foundation of China(U0734001;50874050) the Fundamental Research Funds for the Central Universities, SCUT(2009ZZ0025)

Thermal Growth and Nanomagnetism of the Quasi-one Dimensional Iron Oxide

Keywords： Thermal growth

Quasi-one dimensional iron oxide nanowires with flat needle shape were synthesized on the iron powders by a rather simple catalyst-free thermal oxidation process in ambient atmosphere. The characterization by field emission scanning electron microscopy （FE-SEM）, X-ray photoelectron spectroscopy （XPS）, X-ray diffraction （XRD）, Raman and high-resolution transmission electron microscopy （HRTEM） revealed that these nanos- tructures are single crystalline α-Fe2O3. The various dimensions with 40-170 nm in width and 1-8 μm in length were obtained by tuning the growth temperature from 280 to 480℃. A surface diffusion mechanism was proposed to account for the growth of quasi-one dimensional nanostructure. The typical α-Fe203 nanowires synthesized at 430℃ had a reduced Morin temperature TM of 131 K in comparison with their bulk counterpart. The coercivitis Hc of these nanowires are 321 and 65 Oe at 5 and 300 K, respectively. The temperature of synthesis also has important effects on the magnetic properties of these nanowires.

参考文献

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[2]	M.L. Zhong;D.C. Zeng;Z.W. Liu;H.Y. Yu;X.C. Zhong;W.Q. Qiu .Synthesis, growth mechanism and gas-sensing properties of large-scale CuO nanowires[J].Acta materialia,2010(18):5926-5932.

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Thermal Growth and Nanomagnetism of the Quasi-one Dimensional Iron Oxide

Thermal Growth and Nanomagnetism of the Quasi-one Dimensional Iron Oxide

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