Exploring lightweight microwave attenuation materials with strong and tunable
wideband microwave absorption is highly desirable but remains a significant
challenge. Herein, three-dimensional (3D) porous hybrid composites consisting of
NiFe nanoparticles embedded within carbon nanocubes decorated on graphene
oxide (GO) sheets (NiFe@C nanocubes@GO) as high-performance microwave
attenuation materials have been rationally synthesized. The 3D porous hybrid
composites are fabricated by a simple method, which involves one-step pyrolysis
of NiFe Prussian blue analogue nanocubes in the presence of GO sheets.
Benefiting from the unique structural features that exhibit good magnetic and
dielectric losses as well as a proper impedance match, the resulting NiFe@C
nanocubes@GO composites show excellent microwave attenuation ability. With
a minimum reflection loss (RL) of –51 dB at 7.7 GHz at a thickness of 2.8 mm
and maximum percentage bandwidth of 38.6% for RL < –10 dB at a thickness of
2.2 mm, the NiFe@C nanocubes@GO composites are superior to the previously
reported state-of-the-art carbon-based microwave attenuation materials.