Facile synthesis 3D porous MXene Ti3C2Tx@RGO composite aerogel with excellent dielectric loss and electromagnetic wave absorption

Wang, Linbo; Liu, Hui; Lv, Xuliang; Cui, Guangzhen; Gu, Guangxin

doi:10.1016/j.jallcom.2020.154251

Cited by 204 publications

(85 citation statements)

References 68 publications

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“…One is to introduce high dielectric loss materials to compound MXene via the heterogeneous interfacial construction, such as surface decoration [ 22 ], element doping [ 23 ], and micro–nano architecture designing [ 24 ]. Owing to the excellent conductivity, light weight and good environment stability, carbon (C) materials, mainly including C nanospheres [ 25 ], 1D CNTs [ 26 ], 2D graphene oxide (GO/rGO) [ 27 ], and 3D graphene foam [ 2 ], are the common high dielectric loss materials. Zhao et al prepared MXene/C nanospheres hybrids with massive heterogeneous interface, indicating the reflection loss (RL) value of − 54.67 dB [ 25 ].…”

Section: Introductionmentioning

confidence: 99%

3D Seed-Germination-Like MXene with In Situ Growing CNTs/Ni Heterojunction for Enhanced Microwave Absorption via Polarization and Magnetization

You

et al. 2021

Nano-Micro Lett.

146

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Highlights Benefiting from the possible “seed-germination” effect, the “seeds” Ni2+ grow into “buds” Ni nanoparticles and “stem” carbon nanotubes (CNTs) from the enlarged “soil” of MXene skeleton. Compared with the traditional magnetic agglomeration, the MXene-CNTs/Ni hybrids exhibit the highly spatial dispersed magnetic architecture. 3D MXene-CNTs/Ni composites hold excellent microwave absorption performance (−56.4 dB at only 2.4 mm). Abstract Ti3C2Tx MXene is widely regarded as a potential microwave absorber due to its dielectric multi-layered structure. However, missing magnetic loss capability of pure MXene leads to the unmatched electromagnetic parameters and unsatisfied impedance matching condition. Herein, with the inspiration from dielectric-magnetic synergy, this obstruction is solved by fabricating magnetic CNTs/Ni hetero-structure decorated MXene substrate via a facile in situ induced growth method. Ni2+ ions are successfully attached on the surface and interlamination of each MXene unit by intensive electrostatic adsorption. Benefiting from the possible “seed-germination” effect, the “seeds” Ni2+ grow into “buds” Ni nanoparticles and “stem” carbon nanotubes (CNTs) from the enlarged “soil” of MXene skeleton. Due to the improved impedance matching condition, the MXene-CNTs/Ni hybrid holds a superior microwave absorption performance of − 56.4 dB at only 2.4 mm thickness. Such a distinctive 3D architecture endows the hybrids: (i) a large-scale 3D magnetic coupling network in each dielectric unit that leading to the enhanced magnetic loss capability, (ii) a massive multi-heterojunction interface structure that resulting in the reinforced polarization loss capability, confirmed by the off-axis electron holography. These outstanding results provide novel ideas for developing magnetic MXene-based absorbers.

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Section: Introductionmentioning

confidence: 99%

3D Seed-Germination-Like MXene with In Situ Growing CNTs/Ni Heterojunction for Enhanced Microwave Absorption via Polarization and Magnetization

You

et al. 2021

Nano-Micro Lett.

146

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“…It is undoubted that WCC-6 is the best candidate among these tungsten carbide/carbon composites, no matter from RL intensity or qualified absorption bandwidth. In order to validate the performance of WCC-6 with those reported carbide/carbon composites, we summarize their RL characteristics in some appointed frequency intervals (Table 1 ) [ 28 – 31 , 34 – 37 , 60 – 63 ]. In general, researchers pay more attention to qualified absorption bandwidth, because there is no essential difference when RL intensity exceeds − 10.0 dB.…”

Section: Resultsmentioning

confidence: 99%

Solvent-Free Synthesis of Ultrafine Tungsten Carbide Nanoparticles-Decorated Carbon Nanosheets for Microwave Absorption

et al. 2020

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HIGHLIGHTS • Ultrafine tungsten carbide nanoparticles-decorated carbon nanosheets were successfully fabricated via a simple solvent-free strategy. • The chemical composition of tungsten carbide/carbon composites can be easily manipulated by the weight ratio of dicyandiamide to ammonium metatungstate. • The advantages in good performance and simple preparation provide a promising prospect for the application of these tungsten carbide/ carbon composites. ABSTRACT Carbides/carbon composites are emerging as a new kind of binary dielectric systems with good microwave absorption performance. Herein, we obtain a series of tungsten carbide/carbon composites through a simple solvent-free strategy, where the solid mixture of dicyandiamide (DCA) and ammonium metatungstate (AM) is employed as the precursor. Ultrafine cubic WC 1−x nanoparticles (3-4 nm) are in situ generated and uniformly dispersed on carbon nanosheets. This configuration overcomes some disadvantages of conventional carbides/carbon composites and is greatly helpful for electromagnetic dissipation. It is found that the weight ratio of DCA to AM can regulate chemical composition of these composites, while less impact on the average size of WC 1−x nanoparticles. With the increase in carbon nanosheets, the relative complex permittivity and dielectric loss ability are constantly enhanced through conductive loss and polarization relaxation. The different dielectric properties endow these composites with distinguishable attenuation ability and impedance matching. When DCA/AM weight ratio is 6.0, the optimized composite can produce good microwave absorption performance, whose strongest reflection loss intensity reaches up to − 55.6 dB at 17.5 GHz and qualified absorption bandwidth covers 3.6-18.0 GHz by manipulating the thickness from 1.0 to 5.0 mm. Such a performance is superior to many conventional carbides/carbon composites.

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“…For instance, Zhang et al fabricated Ti 3 C 2 T x MXene materials; when the filler loading was up to 50 wt %, the maximum RL of Ti 3 C 2 T x MXene was –29.6 dB with a thickness of 1.8 mm and the effective absorption bandwidth was less than 3 GHz [ 19 ]. Previous studies have confirmed the principle that the combination of MXene and other materials can effectively construct the heterogeneous, which is beneficial to attenuate the EM energies such as Ti 3 C 2 T x @RGO [ 20 ], Ti 3 C 2 T x @Ni [ 21 ], Ti 3 C 2 T x /CNTs [ 22 ], and Ti 3 C 2 T x @poly (vinyl alcohol) [ 23 ]. Among them, the composite of Ti 3 C 2 T x and nanomaterials has been found to further improve the absorption performance.…”

Section: Introductionmentioning

confidence: 88%

Heterostructure Composites of CoS Nanoparticles Decorated on Ti3C2Tx Nanosheets and Their Enhanced Electromagnetic Wave Absorption Performance

Liu

Cui

et al. 2020

Nanomaterials

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As a typical two-dimensional material, MXene possesses excellent conductivity and tunable interlayer space, which makes it have an impressive development potential in the field of electromagnetic (EM) waves absorbing materials. In this work, we fabricated a sandwich structure CoS@Ti3C2Tx composite using a simple solvothermal process. The CoS nanoparticles are anchored on the Ti3C2Tx MXene sheets, forming a heterolayered structure. The results demonstrate that the CoS@Ti3C2Tx composites with the sandwich-like architecture showed excellent EM absorbing performance due to the synergistic effects of the conductivity loss, interface polarization, and dipole polarization. When the doping ratio was 40 wt %, the maximum reflection loss value of CoS@Ti3C2Tx was up to –59.2 dB at 14.6 GHz, and the corresponding effective absorption bandwidth (below –10 dB) reached 5.0 GHz when the thickness was only 2.0 mm. This work endows a new candidate for the design of MXene-based absorption materials with optimal performance.

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Facile synthesis 3D porous MXene Ti3C2Tx@RGO composite aerogel with excellent dielectric loss and electromagnetic wave absorption

Cited by 204 publications

References 68 publications

3D Seed-Germination-Like MXene with In Situ Growing CNTs/Ni Heterojunction for Enhanced Microwave Absorption via Polarization and Magnetization

3D Seed-Germination-Like MXene with In Situ Growing CNTs/Ni Heterojunction for Enhanced Microwave Absorption via Polarization and Magnetization

Solvent-Free Synthesis of Ultrafine Tungsten Carbide Nanoparticles-Decorated Carbon Nanosheets for Microwave Absorption

Heterostructure Composites of CoS Nanoparticles Decorated on Ti3C2Tx Nanosheets and Their Enhanced Electromagnetic Wave Absorption Performance

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