Conjugate ferrocene polymer derived magnetic Fe/C nanocomposites for electromagnetic absorption application

Coordination bonds are relatively unstable compared to covalent bonds, and common carbon-based absorbing material precursors are bonded in the form of coordination bonds. In this work, we have introduced ferrocene units into conjugated microporous polymers (CMP) in one step by Suzuki reaction. By adjusting the proportion of ferrocene units, a series of magnetic Fe-C nanocomposites (Fe-P-XC) derived from conjugated ferrocene polymers without heteroatom doping (N, S, P, etc.) were formed. The Fe-P-2C composite has good absorption properties with minimum reflection loss at 4.4 GHz (-58.66 dB) and effective absorption bandwidth (EAB) of 6.28 GHz at 2.4 mm (11.72–18 GHz). Compared with the precursor materials formed by coordination bonds, the present work reveals the electromagnetic wave absorption mechanism of carbon-based materials without heteroatom doping through a simple and effective strategy.