Nanostructured Ketjen black/Fe3O4 core/shell particles have been prepared through a simple one-step hydrother-mal method.The microstructure analysis shows that the as-synthesized composite particles display a typical core/shell structure:the Ketjen black is playing as the core,while a large number of Fe3O4 nanoparticles are uniformly attaching to the surface of the Ketjen black and forming the shell.The investigation of the magnetic properties of the nanostructured Ketjen black/Fe3O4 core/shell materials reveals that the as-synthesized composite is a typical soft ferromagnetism material.The 40 wt％Ketjen black/Fe3O4-paraffin composites exhibit an excellent reflection loss value of—64.21 dB at a thickness of 2.00 mm,and the broadest effective bandwidth of 4.17 GHz at a thickness of 1.50 mm.This work provides a brand-new type of mag-netic carbon nanoparticles,defined as Ketjen black/Fe3O4 core/shell particles,which are an excellent candidate for high-performance electromagnetic wave absorber materials.

Jing An;Chen-Yang Zhao;Zi-Jun He;Xing Mu;Shi-Hai Guo;Li-Hong Xu;Jun He;Dong-Liang Zhao

Department of Functional Material Research,Central Iron and Steel Research Institute,Beijing 100081,China

稀有金属（英文版）

[1]Jing An;Chen-Yang Zhao;Zi-Jun He;Xing Mu;Shi-Hai Guo;Li-Hong Xu;Jun He;Dong-Liang Zhao-.Synthesis and microwave absorption property of nanostructured Ketjen black/Fe3O4 core/shell particles)[J].稀有金属（英文版）,2022(10):3351-3359

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