The Fabrication and High-Efficiency Electromagnetic Wave Absorption Performance of CoFe/C Core–Shell Structured Nanocomposites

摘要

CoFe/C core–shell structured nanocomposites (CoFe@C) have been fabricated through the thermal decomposition of acetylene with CoFe~(2)O~(4)as precursor. The as-prepared CoFe@C was characterized by X-ray powder diffraction, X-ray photoelectron spectroscopy, Raman spectroscopy, transmission electron microscopy, and thermogravimetric analysis. The results demonstrate that the carbon shell in CoFe@C has a poor crystallization with a thickness about 5–30?nm and a content approximately 48.5?wt.%. Due to a good combination between intrinsic magnetic properties and high-electrical conductivity, the CoFe@C exhibits not only excellent absorption intensity but also wide frequency bandwidth. The minimum RL value of CoFe@C can reach ??44?dB at a thickness of 4.0?mm, and RL values below ??10?dB is up to 4.3?GHz at a thickness of 2.5?mm. The present CoFe@C may be a potential candidate for microwave absorption application.