Highly stable carbon-coated Fe/SiO2 composites: Synthesis, structure and magnetic properties |
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Authors: | N.J. Tang H.Y. Jiang S.L. Huang Y.W. Du |
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Affiliation: | National Laboratory of Solid State Microstructures, and Jiangsu Provincial Laboratory for NanoTechnology, Nanjing University, Nanjing 210093, PR China |
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Abstract: | A new method to coat Fe nanoparticles with carbon by pyrolysis of acetylene is reported. The Fe nanoparticles were beforehand coated with silica layers by sol-gel combined hydrogen method. The antioxidation capability of Fe/SiO2 composites has enhanced greatly after coated with amorphous carbon shells. By the introduction of only 7.5 wt.% nonmagnetic silica and carbon, these composites have relatively high specific magnetization of 200.27 emu/g. The insulating amorphous silica and carbon shells prove effective to reduce the eddy current at high frequency. |
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Keywords: | Carbon composites Coating Magnetic properties |
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