One-step synthesis of cobalt nanosheets depositing with carbon microsphere by microwave plasma assisted reduction chemical vapor deposition technique against electromagnetic pollution

Abstract

The rational design of magnetic carbon composites in both composition and microstructure has significant potential for acquiring excellent electromagnetic wave absorbing materials (EAMs). In this study, Co@carbon magnetic composites were prepared by employing a novel microwave plasma assisted reduction chemical vapor deposition (MPARCVD) technique, which was highly efficient, low-cost, and energy-saving. The depositing of graphitized carbon microspheres on the surface of Co nanosheets could enrich the available loss mechanisms. Furthermore, the lamelliform morphology with a large aspect ratio of the composites was beneficial to subtly improve the dielectric properties under a low filler content. As a consequence, the minimum RL reached up to −65.7 dB and the radar cross-sectional area reduction attained to 22.3 dBm 2 with only 20 wt% loading content. The MARCVD technology opened a novel strategy and avenue for acquiring magnetic carbon composites as candidates for lightweight and high-performance EAMs.