Preparation and electromagnetic wave absorption performance of Fe3Si/SiC@SiO2 nanocomposites

This paper aimed to prepare an effective absorber with tunable electromagnetic wave (EMW) absorption capabilities and excellent physicochemical stability within the frequency range of 2-18 GHz. Typically, the nanocomposites constructed by SiC@SiO2 nanowire and Fe3Si magnetic nanoparticle (Fe3Si/SiC@SiO2) had been prepared based on an in-situ carbon thermal reduction strategy. The as-prepared products had exhibited broad effective absorption bandwidth of up to 5.4 GHz and a thin thickness of 2.4 mm; besides, the minimal reflection loss (RL) value was as low as -37.53 dB at 15.5 GHz, implying that the as-prepared nanocomposite had displayed extensive application potential as an EMW absorber candidate. Moreover, results of systematic characterization suggested that, the Fe3Si magnetic nanoparticles had exerted a positive role in pure SiC@SiO2 nanowires to improve the EMW absorption performance. In addition, the attenuation of EMW should be attributed to the synergistic effect derived from impedance matching, dielectric loss, magnetic loss and interface polarization.