Synthesis of Ultralight and Porous Magnetic g-C3N4/g-Carbon Foams with Excellent Electromagnetic Wave (EMW) Absorption Performance and Their Application as a Reinforcing Agent for 3D Printing EMW Absorbers
2020
Herein, magnetic g-C3N4/g-carbon foams (CNFs)
are fabricated via impregnating the as-prepared melamine–formaldehyde
(MF) foams in iron acetylacetone (Fe(acac)3) N,N-dimethylformamide (DMF) solutions with different
concentrations followed by in situ pyrolysis. The
corresponding electromagnetic wave (EMW) absorption behaviors are
investigated. CNFs display solid 3D foam architectures with narrow
and smooth skeletons, which consist of graphitic C3N4/carbon and CFe15.1. The in situ as-synthesized α-Fe, Fe3O4, and Fe3C particles are dispersed on the skeleton surface. With the
increase of Fe elemental content, the EMW absorption performance of
CNFs is enhanced. Among them, the minimum reflection loss value of
CNF-3 is as low as −52.17 dB, with a matching thickness (tm) of 4.25 mm and a broad effective absorbing
bandwidth of 9.37 GHz. Besides, CNF-3 exhibits potential simultaneously
effective absorption performance from the X-band to the Ku-band. This
superior absorption behavior is attributed to Maxwell–Wagner–Sillars
polarization, residual loss effect, enriched interface polarization
effect, and macroporous structures. Further research studies demonstrate
the potential application of CNF-3 as a reinforcing agent for PCL-based
3D printing EMW absorbers with improved mechanical properties. The
corresponding EMW absorption matching frequency can be adjusted by
the number of 3D printing layers.
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