Large-Scale Synthesis of Single-Crystalline Iron Oxide Magnetic Nanorings

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2008
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Jia, Chun-Jiang
Sun, Ling-Dong
Luo, Feng
Han, Xiao-Dong
Heyderman, Laura J.
Yan, Zheng-Guang
Yan, Chun-Hua
Zheng, Kun
Zhang, Ze
Takano, Mikio
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Journal of the American Chemical Society. 2008, 130(50), pp. 16968-16977. Available under: doi: 10.1021/ja805152t
Zusammenfassung

We present an innovative approach to the production of single-crystal iron oxide nanorings employing a solution-based route. Single-crystal hematite (ɑ-Fe2O3) nanorings were synthesized using a double anion-assisted hydrothermal method (involving phosphate and sulfate ions), which can be divided into two stages: (1) formation of capsule-shaped ɑ-Fe2O3 nanoparticles and (2) preferential dissolution along the long dimension of the elongated nanoparticles (the c axis of ɑ-Fe2O3) to form nanorings. The shape of the nanorings is mainly regulated by the adsorption of phosphate ions on faces parallel to c axis of ɑ-Fe2O3 during the nanocrystal growth, and the hollow structure is given by the preferential dissolution of the ɑ-Fe2O3 along the c axis due to the strong coordination of the sulfate ions. By varying the ratios of phosphate and sulfate ions to ferric ions, we were able to control the size, morphology, and surface architecture to produce a variety of three-dimensional hollow nanostructures. These can then be converted to magnetite (Fe3O4) and maghemite (ɣ-Fe2O3) by a reduction or reduction-oxidation process while preserving the same morphology. The structures and magnetic properties of these single-crystal ɑ-Fe2O3, Fe3O4, and ɣ-Fe2O3 nanorings were characterized by various analytical techniques. Employing off-axis electron holography, we observed the classical single-vortex magnetic state in the thin magnetite nanorings, while the thicker rings displayed an intriguing three-dimensional magnetic configuration. This work provides an easily scaled-up method for preparing tailor-made iron oxide nanorings that could meet the demands of a variety of applications ranging from medicine to magnetoelectronics.

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ISO 690JIA, Chun-Jiang, Ling-Dong SUN, Feng LUO, Xiao-Dong HAN, Laura J. HEYDERMAN, Zheng-Guang YAN, Chun-Hua YAN, Kun ZHENG, Ze ZHANG, Mikio TAKANO, Naoaki HAYASHI, Matthias ELTSCHKA, Mathias KLÄUI, Ulrich RÜDIGER, Takeshi KASAMA, Lionel CERVERA-GONTARD, Rafal E. DUNIN-BORKOWSKI, George TZVETKOV, Jörg RAABE, 2008. Large-Scale Synthesis of Single-Crystalline Iron Oxide Magnetic Nanorings. In: Journal of the American Chemical Society. 2008, 130(50), pp. 16968-16977. Available under: doi: 10.1021/ja805152t
BibTex
@article{Jia2008Large-4922,
  year={2008},
  doi={10.1021/ja805152t},
  title={Large-Scale Synthesis of Single-Crystalline Iron Oxide Magnetic Nanorings},
  number={50},
  volume={130},
  journal={Journal of the American Chemical Society},
  pages={16968--16977},
  author={Jia, Chun-Jiang and Sun, Ling-Dong and Luo, Feng and Han, Xiao-Dong and Heyderman, Laura J. and Yan, Zheng-Guang and Yan, Chun-Hua and Zheng, Kun and Zhang, Ze and Takano, Mikio and Hayashi, Naoaki and Eltschka, Matthias and Kläui, Mathias and Rüdiger, Ulrich and Kasama, Takeshi and Cervera-Gontard, Lionel and Dunin-Borkowski, Rafal E. and Tzvetkov, George and Raabe, Jörg}
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