Solid and macroporous Fe3C/N-C nanofibers with enhanced electromagnetic wave absorbability.

ABSTRACT: A series of solid and macroporous N-doped carbon nanofibers composed of Fe3C nanoparticles (named as solid Fe3C/N-C NFs, solid Fe3C/N-C NFs-1, solid Fe3C/N-C NFs-2, macroporous Fe3C/N-C NFs, macroporous Fe3C/N-C NFs-1 and macroporous Fe3C/N-C NFs-2, respectively) were prepared through carbonization of as-electrospun nanofiber precursors. The results show that the magnetic Fe3C nanoparticles (NPs) dispersed homogeneously on the N-doped carbon fibers; as-prepared six materials exhibit excellent microwave absorption with a lower filler content in comparison with other magnetic carbon hybrid nanocomposites in related literatures. Particularly, the solid Fe3C/N-C NFs have an optimal reflection loss value (RL) of -33.4?dB at 7.6?GHz. For solid Fe3C/N-C NFs-2, the effective absorption bandwidth (EAB) at RL value below -10 dB can be up to 6.2?GHz at 2?mm. The macroporous Fe3C/N-C NFs have a broadband absorption area of 4.8?GHz at 3?mm. The EAB can be obtained in the 3.6-18.0?GHz frequency for the thickness of absorber layer between 2 and 6?mm. These Fe3C-based nanocomposites can be promising as lightweight, effective and low-metal content microwave absorption materials in 1-18?GHz.

SUBMITTER: Liu H 

PROVIDER: S-EPMC6237827 | biostudies-literature | 2018 Nov

REPOSITORIES: biostudies-literature