Nanostructured Ketjen black/Fe_(3)O_(4) core/shell particles have been prepared through a simple one-step hydrothermal method.The microstructure analysis shows that the assynthesized composite particles display a typical core/shell structure:the Ketjen black is playing as the core,while a large number of Fe_(3)O_(4) 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/Fe_(3)O_(4) core/shell materials reveals that the as-synthesized composite is a typical soft ferromagnetism material.The 40 wt%Ketjen black/Fe_(3)O_(4)-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 of1.50 mm.This work provides a brand-new type of magnetic carbon nanoparticles,defined as Ketjen black/Fe_(3)O_(4)core/shell particles,which are an excellent candidate for high-perform ance electromagnetic wave absorber materials.
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