Large-Scale Synthesis and Microwave Absorption Properties of CoFe₂O₄/ Co_0.4Zn_0.6Fe₂O₄ Hollow Nanospheres

Abstract:

Monodisperse CoFe₂O₄ and Co_0.4Zn_0.6Fe₂O₄ hollow nanospheres were synthesized in large scale by solvothermal method in ethylene glycol solution. The structure, shape and size of the samples were investigated by Fourier Transform infrared, X-ray powder diffraction and scanning electron microscopy. The results indicate that the products are spherical with an average diameter less than 200 nm. Magnetic studies revealed that the saturation magnetization of Co_0.4Zn_0.6Fe₂O₄ is 78.6 emu/g, higher than the CoFe₂O₄, which is 69 emu/g, while the coercivity of the Co_0.4Zn_0.6Fe₂O₄ is 184 Oe , obviously lower than that of CoFe₂O₄ which is 832 Oe. The electromagnetic parameters were measured at 2-18 GHz using HP8722ES vector network analyzer and then the microwave absorption properties were calculated through the transmission line theory. As to the Co_0.4Zn_0.6Fe₂O₄, the absorption bandwidth with reflection loss below-10 dB is up to 3GHz, from 10GHz to 13GHz with a thickness of 2 mm. A maximum reflection loss-45.6 dB was found at 12.9 GHz for the CoFe₂O₄ with a thickness of 1.8 mm. As a result, the as-prepared hollow nanospheres show good prospects of being applied in EM wave absorption materials.

• Periodical: Key Engineering Materials (Volumes 645-646)
• Pages: 126-131
• DOI: https://doi.org/10.4028/www.scientific.net/KEM.645-646.126
• Online since: May 2015
• Authors: Qing Guo Ren, Xiao Jing Qiao*, Yan Li, Zhi Gang Sun, Xiao Dang Guo, Shuai Zhong Zhang
• Keywords: Absorption, Electromagnetic Wave, Ferrite, Hollow Nanospheres, Solvothermal

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