Flexible carbon fibres with magnetic ZIF-67 as core layer and in-situ grown NiMn-LDH nanosheets as shell layer for microwaves absorption

Abstract

Fabrication of high-performance microwaves absorbers by assembling multi-dimensional nanocomponents into core-shell electromagnetic structures has been shown to be a new manufacturing strategy. In this work, a novel core-shell carbon-fibres@ZIF-67@NiMn-Layered double hydroxides (NiMn-LDH) film with excellent electromagnetic waves absorption was obtained by electrospinning ZIF-67 inside the carbon fibre and subsequent solvothermal NiMn-LDH. By the synergistic effects from the Co particles in ZIF-67 increasing the magnetic loss, the appropriate proportion of carbon fibre as a carbon source not only improves the dielectric loss but also provides a carrier for NiMn-LDH. And NiMn-LDH at the outer shell, improving the impendence matching. Co/carbon fibres@NiMn-LDH (Co/CFs@NiMn-LDH) composited at a thickness of 2.8 mm with minimum reflection loss (R of -53 dB, and it also has good flexibility. The EAB of the obtained CFs@NiMn-LDH reaches 6.7 GHz. This work provides a reference for the application of flexible carbon matrix composites in electromagnetic wave absorption field.