Abstract
In the present work, Fe3O4 nanospheres, sponges, and urchins were prepared. Investigation of static magnetic and microwave electromagnetic (EM) characteristics of polymorphic Fe3O4 nanomaterials showed that morphology plays a crucial role in determining the resulting properties. Compared with Fe3O4 nanospheres and urchins, enhanced saturation magnetization and coercivity were observed in Fe3O4 sponges composed of ordered nanofibers. Enhancement of saturation magnetization and coercivity are associated with increased magnetic interactions and shape anisotropy, respectively. The Fe3O4 sponges and urchins produced reflection loss (RL) values of −35.77 dB at 8.0 GHz and −43.23 dB at 16.8 GHz, respectively. The excellent microwave absorption performance is ascribed to their unique morphologies. Such morphologies resulted in reinforced EM parameters and multiresonant behavior.
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Acknowledgments
This work is financially supported by Natural Science Foundation of Zhejiang Province (Project Nos. Y4100022, Y4110025, and Y4090636), Special Grand Science-Technology Project in Zhejiang Province (No. 2010C11053), the Key Innovative Team of Magnetic Materials in Zhejiang Province (2011R09006-06), and Science and Technology Projects from Jinhua City (Grant Nos. 2010A12066 and 2011A13173).
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Tong, G., Wu, W., Qiao, R. et al. Morphology dependence of static magnetic and microwave electromagnetic characteristics of polymorphic Fe3O4 nanomaterials. Journal of Materials Research 26, 1639–1645 (2011). https://doi.org/10.1557/jmr.2011.131
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DOI: https://doi.org/10.1557/jmr.2011.131