Fabrication of one-dimensional CoFe/C@MoS composites as efficient electromagnetic wave absorption materials.

New types of electromagnetic (EM) wave absorption materials with a light weight, strong absorption ability and wide absorption frequency have been widely explored. Nevertheless, it is still an intractable challenge to design the structure of the materials and rationalize multiple components. In this work, one-dimensional (1D) CoFe/C@MoS composites were prepared via electrospinning technology, high-temperature carbonization and hydrothermal method. SEM and TEM images reveal that the as-prepared CoFe/C fibers with a 1D structure are well coated with MoS. The excellent absorption performance of the composites is mainly attributed to the 1D structure and the ideal impedance matching. CoFe/C@MoS composites show strong absorption ability with an optimal reflection loss (RL) of -66.8 dB (13.28 GHz) at a matching thickness of 2.12 mm. Meanwhile, the composite possesses an effective absorption frequency range between 10.70 and 16.02 GHz with a bandwidth of 5.32 GHz. These results indicate that CoFe/C@MoS composites will become promising lightweight and highly efficient MA materials.