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Available online 3 June 2017 --
Facile preparation and microwave absorption properties of porous Co/CoO microrods, , , , , , , , ,
Department of Materials Science and Engineering, Collaborative Innovation Center of Chemistry for Energy Materials, College of Materials, Xiamen University, Xiamen 361005, China&The porous Co/CoO microrods have been successfully fabricated by a facial method.&Large values of permittivity and permeability of Co/CoO-paraffin wax were obtained.&The porous Co/CoO microrods have excellent performance of microwave absorption at low frequency range with a small thickness.&The features of being &low density, small thickness, strong absorption and wide bandwidth& of absorber were achieved.Electromagnetic wave absorption materials with the features of being low density and porosity have attracted a great deal of attentions. In this manuscript, porous Co/CoO microrods were successfully synthesized through a facial and simple method. The resultant porous Co/CoO microrods exhibited superior microwave absorption properties because of their special structure. The high saturation magnetization of ferromagnetic metal Co component made the as-prepared composites have large relative complex permeability. The porous structures of materials improved the impedance match and enhanced the multiple reflections within the materials. With the 70&wt% of functional filler loading, the relative complex permittivity and permeability had significant increase due to the percolation effect. When the thickness of absorber is only 1.20&mm, the effective bandwidth is from 10.83 to 17.84&GHz covered almost Ku band (12&18&GHz). The minimum value of RL (&47.96&dB) was obtained at the frequency of 8.08&GHz with the thickness of only 1.76&mm. The result shows that this material can be used as a candidate for microwave absorption materials at low frequency range with a small thickness.KeywordsMicrowave absorption; Percolation effect; Porous; Microrods
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