Covalent Bonding of MXene/Reduced Graphene Oxide Composites for Efficient Electromagnetic Wave Absorption

Abstract

Due to their high conductivity and unique surface chemical characteristics, MXene and reduced graphene oxide (rGO) have received a great deal of attention in the field of electromagnetic wave absorption (EMA). This study describes the covalent modification of rGO with amino-functionalized MXene to create an electromagnetic absorbent material called MXene-rGO composite. After amidation, an amide bond successfully assembles MXene and rGO. The absorber performs admirably when the mass ratio of MXene to rGO is 1:2 (sample MG-3). With a thickness of 2.7 mm, the best reflection loss (RL) is −47.98 dB at 6.4 GHz. Additionally, the best effective absorption bandwidth (EAB) (RL< −10 dB) is 4.08 GHz (11.84–15.92 GHz) with a 1.4 mm matching thickness. The performance of the EMA can be obtained by adjusting the dielectric parameters and the migration rate of the electrons using the covalent bond as a stable carrier channel. The high dielectric loss, superior impedance matching, and strong attenuation ability contribute to the great absorption performance.

Research Progress of MXene Composites In Electromagetic Wave Absorption

“…To get the best general impedance distribution out of the composite foam while keeping its bandwidth and ability to absorb sound well. On this basis Yang et al [33] MXene reduced graphene oxide composites were made by adding amino-functionalized MXene to reduced graphene oxide in a covalent way. The optimum reflection loss R L at 6.4 GHz is -47.98 dB when the thickness is 2.7 mm.…”

MXene‐Layered Double Hydroxide Reinforced Epoxy Nanocomposite with Enhanced Electromagnetic Wave Absorption, Thermal Conductivity, and Flame Retardancy in Electronic Packaging

“…At 30 wt% fill amount, MXene@LDH-2 exhibits the lowest RL min value and the widest EAB max value. Figure 3f [18,25,26,[33][34][35][36][37] compares this work with other MXenebased absorbing materials and Table S1 and Figure S6a,b (Supporting Information) compare this work with other advanced material. They clearly demonstrates the excellent EMA performance of MXene@LDH-2 at such a thinner thickness, meeting the requirements of "thin, light, wide, and strong" absorbing materials.…”

Diethylenetriamine-functionalized reduced graphene oxide having more amino groups for methylene blue removal

“…The products or composites possessed excellent properties. These compounds might include 1-aminopropyl-3methylimidazolium chloride, 7 1,4-phenylenediamine or 2,3,5,6-tetramethyl-1,4-phenylenediamine, 8,9 amino-modied MXene (3-trimethoxysilylpropan-1-amine modied MXene), 10 ethylenediamine, [11][12][13] 4,4 ′ -diaminodiphenylmethane, 14 and amino acids (e.g., alanine, tyrosine, and cysteine). 15 The epoxide of GO can also react with an amino group that is also attached directly or indirectly to the graphene sheet.…”