Magnetic carbon nanofibers containing uniformly dispersed Fe/Co/Ni nanoparticles as stable and high-performance electromagnetic wave absorbers

摘要: Carbon nanofibers with ferromagnetic metal nanoparticles (CNF–M, M = Fe, Co, and Ni) have been synthesized by carbonizing electrospun polyacrylonitrile including acetylacetonate in an argon atmosphere, their phase composition, microstructure, magnetic properties electromagnetic (EM)-wave absorbability studied. The microstructure analysis shows that the situ formed are well distributed along carbon-based encapsulated ordered graphite layers. investigation of EM-wave reveals as-synthesized CNF–M has typical characteristics materials exhibits excellent absorption (reflection loss exceeding −20 dB) from C-band to Ku-band (4–18 GHz) over absorber thickness 1.1–5.0 mm due efficient complementarities complex permeability permittivity resulting lightweight carbon, as particular particle/graphite core/shell microstructures CNF–M. Moreover, a minimum reflection value −67.5, −63.1, −61.0 dB is achieved at 16.6, 12.9, 13.1 GHz matching 1.3, 1.6, 1.7 for CNF–Fe, CNF–Co, CNF–Ni, respectively. These carbon attractive candidates new type high performance absorbing materials.