Facile Synthesis of Ultralight and Porous Melamine-Formaldehyde (MF) Resin-Derived Magnetic Graphite-Like C3N4/Carbon Foam with Electromagnetic Wave Absorption Behavior

Abstract

Society demands effective electromagnetic wave (EMW) absorbers that are lightweight, with a broad absorption band and strong absorption, to solve excessive electromagnetic radiation. Herein, ultralight magnetic graphite-like C3N4/carbon foam (MCMF) was fabricated via impregnating polymerized melamine formaldehyde (MF) foams in Fe3O4 nanoparticle solution, followed by in situ pyrolysis at 1000 °C. MCMF possesses porous architectures consisting of graphitic C3N4/carbon and CFe15.1. The magnetic particles (α-Fe, Fe3O4 and Fe3C) were formed and modified on the internal skeleton surface. The EMW absorption capacity of MCMF is better than the that of carbonized MF foam without Fe3O4 (CMF), possessing excellent absorption behavior, with a minimum RL value of −47.38 dB and a matching thickness as thin as 3.90 mm. The corresponding effective absorbing bandwidth is as broad as 13.32 GHz. Maxwell–Wagner–Sillars (MWS) polarization and the residual loss are proved to be beneficial for such superior absorption behavior. Besides, graphitic C3N4 enriches the interface polarization effect and the electromagnetic matching effect. The microporous structures are beneficial for increasing EMW propagation, resulting in internal multiple reflections and scatterings, which are also beneficial for EMW attenuation.

llmenite and Biomass Composite Nanomaterials - A Review

“…Graphitic carbon nitride can be synthesized using various biomasses such as sucrose [91], cellulose [92], melamine [93], poly furfuryl alcohol [94], phenolic resins [95], and sawdust. Synthesis of g-C3N4 is very simple.…”

Recent advance in three-dimensional porous carbon materials for electromagnetic wave absorption

“…The optimal RL min and EAB of S nw SCF reached −31.216 dB and 4.1 GHz at 1.5 mm. Zhao et al [140] loaded Fe 3 O 4 magnetic nanoparticles on melamine-formaldehyde resin and then carbonized the composite to obtain magnetic graphite-like C 3 N 4 /carbon foam (MCMF). The magnetic particles (α-Fe, Fe 3 C or Fe 3 O 4 ) increased the magnetic loss of the material to a certain extent.…”

The Design of a Ferromagnetic/Antiferromagnetic/Semiconductor Multi-Interface for Strong and Wide Broadband Electromagnetic Wave Absorption

“…fabricated magnetic g-C 3 N 4 /g-carbon foams and exhibited outstanding EMW absorption performance. The magnetic graphite-like C 3 N 4 /carbon foam derived from the ultralight and porous melamine-formaldehyde resin by Zhao et al displays a broad absorption band and strong absorption, solving excessive EMW radiation. , It is proved that C 3 N 4 composites are potential EMW-absorbing materials.…”