Size-controlled Synthesis, Characterization and Microwave Absorption Efficiency of Fe3O4 Nanocrystallines

Chem. J. Chinese Universities

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Size-controlled Synthesis, Characterization and Microwave Absorption Efficiency of Fe₃O₄ Nanocrystallines

YAN Ai-Guo, QIU Guan-Zhou, LIU Xiao-He*, SHI Rong-Rong, ZHANG Ning, YI Ran, LI Yong-Bo, GAO Guan-Hua

Department of Inorganic Materials, School of Resources Processing and Bioengineering, Central South University, Changsha 410083, China

Received:2007-06-01 Revised:1900-01-01 Online:2008-01-10 Published:2008-01-10
Contact: LIU Xiao-He

Abstract

Abstract: Fe₃O₄ nanocrystallines were successfully prepared by using the mixed surfactants of SDS and PEG as the protective reagents. The sizes of the nanoparticles can be varied from 10 to 200 nm by adjusting the experimental conditions. The microstructure, size and morphology of the products were investigated in detail by X-ray diffraction(XRD), transmission electron microscopy(TEM), and scanning electron microscopy(SEM). The results indicate that uniform spinel Fe₃O₄ nanospheres were achieved. Magnetic studies on the samples with different sizes reveal that when the size of product is below 80 nm, the saturation magnetization(M_s) increases as the particle size increases, where the coercive force (H_c) decreases as the particle size decreases. Both of electromagnetic performance and microwave adsorption property of Fe₃O₄ nanocrystallines with different sizes were measured by a vector network analyzer(VNA) technique in the frequency region of 2—18 GHz. The results indicate that when the sizes of the samples are below 100 nm, Fe₃O₄ nanocrystallines exhibit a better microwave adsorption property. For example, the reflection loss is up to 32 dB for the sample with the nanoparticle size of 20 nm.

Key words: Fe₃O₄ nanocrystalline, Solvothermal method, Size-control, Magnetic property, Microwave adsorption property

CLC Number:

O614

TrendMD:

YAN Ai-Guo, QIU Guan-Zhou, LIU Xiao-He*, SHI Rong-Rong, ZHANG Ning, YI Ran, LI Yong-Bo, GAO Guan-Hua. Size-controlled Synthesis, Characterization and Microwave Absorption Efficiency of Fe₃O₄ Nanocrystallines
[J]. Chem. J. Chinese Universities, doi: .

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Size-controlled Synthesis, Characterization and Microwave Absorption Efficiency of Fe₃O₄ Nanocrystallines

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