Enhanced Microwave Absorption by Incorporating Fe₃O₄ Nanoparticles into Ordered Mesoporous Carbon

Abstract:

Novel Fe₃O₄/ordered mesoporous carbon (OMC) composite powders have been prepared by impregnation and reduction methods for the microwave absorbing application purpose. The Fe₃O₄ nanoparticles were encapsulated in the mesopores of OMCs, and Fe₃O₄ contents in the composite could be easily controlled by changing the concentration of ferric nitrate solution during the preparation. The Fe₃O₄/OMC composites show very excellent microwave absorbing properties with respect to pure OMC samples, in a frequency ranging of 8.2-12.4 GHz. A minimum reflection loss (RL) value of -32 dB at 11.35 GHz and a broader absorption band with the RL values under -10 dB are obtained when the thickness of samples is 1.6 mm. The enhanced microwave absorption of the Fe₃O₄/OMC nanocomposites is contributed to the better impedance match between dielectric loss and magnetic loss, which originates from the incorporation of magnetic species into OMC.

• Periodical: Advanced Materials Research (Volumes 634-638)
• Pages: 2193-2197
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.634-638.2193
• Online since: January 2013
• Authors: Hu Zhou, Jian Dong Zhuang, Qian Liu
• Keywords: Complex Permittivity and Permeability, Fe₃O₄ Nanoparticle, Impedance Matching, Mesoporous Carbon Materials, Microwave Absorption

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