Ultra-High Electromagnetic Absorption Property of One-Dimensional Carbon-Supported Ni/Mo2C and Polyvinylidene Fluoride

Abstract

A novel one-dimensional carbon-supported Ni/Mo 2 C (Ni/Mo 2 C-C) nanocomposite with excellent electromagnetic wave absorption properties was successfully synthesized by annealing NiMoO 4 @PDA directly, and then the (Ni/Mo 2 C-C)/polyvinylidene fluoride (PVDF) composites were fabricated using a simple blending and hot-molding technique. An excellent reflection loss (RL) of −55.91 dB at 9.28 GHz with a low filler loading (15 wt%) and effective bandwidth (RL < −10 dB) of 14.12 GHz in the thickness range of 1.5–5.0 mm was obtained. Dielectric loss is considered to be the dominant mechanism of (Ni/Mo 2 C-C)/PVDF, which was confirmed by the Debye relaxation process and attenuation theory.

Recent Progress in Hexagonal Ferrites Based Composites for Microwave Absorption

“…Due to the composites' high attenuation of electromagnetic waves may be employed as antiradar devices and shielding materials to reduce electromagnetic interference. [183] Numerous researchers have synthesized nanocomposites materials capable of absorbing EM radiation, including ferrite/polymer, [184][185][186][187][188][189][190][191][192][193][194] graphene/polymer, [195][196][197][198][199][200][201][202] hexaferrite/polymer, [203][204][205] polyaniline/carbon nanotube, [206][207][208][209][279][280][281][282] and polyaniline/MWCNT nanocomposite. In situ polymerization of MWCNTs/BaM/PANI was used by Afghahi et al [210] Their process begins with 30 min of mixing 10 cm 3 DBSA with water.…”

“…[279] Thus, a growing number of researches are devoted to optimizing materials' electromagnetic wave absorption qualities by altering their dielectric and magnetic loss. [280] Afsar and Quan [281] studied micro-and nanosize hexaferrite's complex dielectric and magnetic properties using two alternative measuring approaches. The size-dependent absorption features observed in their study conclude that these materials are adjustable millimeter-wave absorbers.…”

Molybdenum blue preassembly strategy to design bimetallic Fe0.54Mo0.73/Mo2C@C for tuneable and low-frequency electromagnetic wave absorption

“…[24][25][26] Since the first work into Mo 2 C absorbing materials was reported by Ji et al, Mo 2 C has attracted widespread attention in recent years because of its unique chemical stability, dielectric properties, and tuneable properties related to phase composition. [27][28][29][30] However, the effective combination of Mo 2 C and magnetic nanomaterials has not been achieved in the current research because the magnetic nanoparticles are prone to serious agglomeration during the high-temperature synthesis of Mo 2 C, which makes Mo 2 C only absorb electromagnetic waves for a certain fixed medium-or high-frequency range and undoubtedly limits the wider application of Mo 2 C as an EWAM. 21 Wang et al successfully synthesized Ni/ Mo 2 C-C/PVDF nanocomposites with excellent electromagnetic wave absorption performance in the medium-frequency range (9.28 GHz) by an annealing and blending strategy.…”

“…21 Wang et al successfully synthesized Ni/ Mo 2 C-C/PVDF nanocomposites with excellent electromagnetic wave absorption performance in the medium-frequency range (9.28 GHz) by an annealing and blending strategy. 31 Also, Wu et al developed an FeNi 3 /Mo 2 C flexible absorbing paper with a minimum RL of 51.5 dB in the high-frequency range by vacuum filtration (13.7 GHz). 32 Overall, these studies have made outstanding contributions in how to reliably combine Mo 2 C with magnetic materials to absorb electromagnetic waves in both the medium-and high-frequency range; whereas little is known about the structure-activity relationship and mechanism of action of Mo 2 C-based magnetic absorbing systems in the low-frequency region.…”

In Situ Derived Porous CoNi@Mo2C-CNT Composites for Excellent Electromagnetic Wave Absorption Properties

“…The hollow N-doped carbon polyhedra-embedded Co and Mo 2 C nanoparticles have been synthesized and exhibited wide-band microwave absorption depending on the enhanced interfacial polarization loss induced by multiple heterogeneous interfaces . Based on the advantages of one-dimensional materials with a large length–diameter ratio, high thermal stability, and good mechanical properties, further constructing one-dimensional materials with high specific surface area and modified with a variety of magnetic metals is more conducive to enhancing the electromagnetic wave absorption performance. , To date, a great deal of research has proven that Mo 2 C-based absorbers deliver excellent EM wave absorption performance; however, there is still a lack of investigations to identify the mechanism behind the fact that magnetic metal compositions and microstructures can strengthen EM wave absorption. , Specifically, the influence of other components on the electronic structure of Mo 2 C was not fully considered.…”