Graphene and MXene Nanomaterials: Toward High-Performance Electromagnetic Wave Absorption in Gigahertz Band Range

Layered double hydroxides (LDHs) have a special structure and atom composition, which are expected to be an excellent electromagnetic wave (EMW) absorber. However, it is still a problem that obtaining excellent EMW-absorbing materials from LDHs. Herein, we designed heterostructure NiCo-LDHs@ZnO nanorod and then subsequent heat treating to derive NiCo@C/ZnO composites. Finally, with the synergy of excellent dielectric loss and magnetic loss, an outstanding absorption performance could be achieved with the reflection loss of − 60.97 dB at the matching thickness of 2.3 mm, and the widest absorption bandwidth of 6.08 GHz was realized at 2.0 mm. Moreover, this research work provides a reference for the development and utilization of LDHs materials in the field of microwave absorption materials and can also provide ideas for the design of layered structural absorbers.

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Construction of 1D Heterostructure NiCo@C/ZnO Nanorod with Enhanced Microwave Absorption.

Tailoring MOF-based materials to tune electromagnetic property for great microwave absorbers and devices

Template-free self-assembly of MXene and CoNi-bimetal MOF into intertwined one-dimensional heterostructure and its microwave absorbing properties

FeNi nanoparticles embedded reduced graphene/nitrogen-doped carbon composites towards the ultra-wideband electromagnetic wave absorption.

In this work, we use a metal–organic framework and layered double hydroxide nanosheets as precursors to grow transition-metal nanoparticle-encapsulated nitrogen-doped carbon nanotubes on ultrathin graphene sheets. The as-fabricated samples exhibit three-dimensional structures with high electrical conductivities, abundant defects, multiple interfaces and nitrogen dopants. As applied for the attenuation of electromagnetic energy, the optimized 3D architecture with CoNi bimetal nanoparticles exhibits excellent attenuation properties of electromagnetic energy even at a thin thickness of 1.5 mm and a low filling ratio of 10 wt% in a paraffin matrix, superior to those of single-metal based 3D architectures and most reported materials. The experimental results demonstrate that the dielectric loss and the impedance matching characteristic can be modulated by adjusting metal compositions, which are responsible for the difference of the 3D architectures in EME attenuation properties. Our strategy opens a new way for lightweight materials for the attenuation of electromagnetic energy.

Three dimensional graphene-supported nitrogen-doped carbon nanotube architectures for attenuation of electromagnetic energy

Carbon nanotube@polypyrrole (CNT@PPy) hybrids have been successfully fabricated via a simple in situ chemical oxidation polymerization. The thickness of the PPy shell can be finely controlled in the range of 3.0–6.4 nm. The dielectric loss of core-shell hybrids can be tuned by the shell thickness, resulting in a well-matched characteristic impedance that can enhance electromagnetic wave (EMW) absorption performance. Minimum reflection loss of the hybrid with moderate PPy shell thickness can reach −51.4 dB at 11.8 GHz with a matching thickness of merely 2 mm. Furthermore, the minimum reflection loss values of the hybrid are below −30 dB even at thickness in the range of 1.4–1.9 mm, endowing the possibility of practical application of the hybrids in electromagnetic wave absorption field.

Tunable Dielectric Properties of Carbon Nanotube@Polypyrrole Core-Shell Hybrids by the Shell Thickness for Electromagnetic Wave Absorption

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Three dimensional graphene-supported nitrogen-doped carbon nanotube architectures for attenuation of electromagnetic energy

Tunable Dielectric Properties of Carbon Nanotube@Polypyrrole Core-Shell Hybrids by the Shell Thickness for Electromagnetic Wave Absorption