Prussian Blue Derived Fe/C Anchoring on Multiwalled Carbon Nanotubes Forming Chain-Like Efficient Electromagnetic Wave Absorbent

Lightweight composites with excellent electromagnetic wave (EMW) absorption performance have attracted increasing attention from researchers. Among these composites, multiwalled carbon nanotubes (MCNTs) are considered as potential candidates, exhibiting excellent dielectric loss, but their magnetic loss is very weak. In our work, we synthesize a one-dimensional chain-like composite with Prussian blue (PB) derived Fe/C anchoring on MCNTs (MCNTs@Fe/C) by two facile processes. The MCNTs are successfully magnetically modified by Fe/C, the derivative of PB, forming an efficient EMW absorbent. The EMW absorption performance is related to complex permittivity and permeability, which can be adjusted by changing the content of PB and MCNTs and the annealing temperature; consequently great attenuation capability and favorable input impedance (Z(in)) was acquired. The minimum reflection loss (RL) reached - 44.26 dB at 8.32 GHz with a thickness of 2.4 mm, the corresponding absorption bandwidth (RL < - 10 dB) was 3.68 GHz (5.6-9.28 GHz), and the coercivity was 151.85 Oe. This work offers a chain-like structure composite which can effectively attenuate EMW energy and paves a way for designing lightweight EMW absorbents.