Facile synthesis of 3D Ni@C nanocomposites derived from two kinds of petal-like Ni-based MOFs towards lightweight and efficient microwave absorbers

Abstract

3D conductive networks constructed by decorating petal-like Ni-based MOFs on the surface of graphene nanosheets exhibit superior microwave absorption properties.

A novel multi-dimensional structure of graphene-decorated composite foam for excellent stealth performance in microwave and infrared frequency bands

“…56 The typical relaxation loss is Debye dielectric relaxation. But when it comes to the high conductivity absorber in our work, the Debye model needs to be modified and the ε ′′ can be expressed as: 57,58 where is the polarization loss part of the dielectric loss, is the conduction loss part of the dielectric loss, ε s is the static permittivity at the low frequency limit, ε ∞ is the relative permittivity at the high frequency limit, τ is the relaxation time, f is the frequency, σ is the electrical conductivity, and ε 0 is the permittivity of vacuum. The conduction loss and polarization loss calculated by using eqn (5) are shown in Fig.…”

Cubic-like Co/NC composites derived from ZIF-67 with a dual control strategy of size and graphitization degree for microwave absorption

“…7d), so the source of magnetic loss is not only eddy current loss, but also natural resonance and exchange resonance. 43,44 Natural resonance often occurs in the low frequency region, while exchange resonance often occurs in the high frequency region. 45 Therefore, that formed at 6 GHz and at the lower frequency band is attributed to natural resonance, and that formed near 11.5 GHz is attributed to exchange resonance.…”

Composition Optimization and Microstructure Design in MOFs-Derived Magnetic Carbon-Based Microwave Absorbers: A Review

“…Lv et al employed ZIF-67 as the precursor to produce porous Co/C nanocomposites with reflection loss (RL) intensity of − 35.3 dB and effective absorption bandwidth (EAB) of 5.8 GHz with the absorber thickness of 4.0 and 2.5 mm, respectively [29]. To date, there have been hundreds of papers concerned on EM absorption of MOFsderived magnetic carbon-based composites, and most microwave absorbers therein did make some significant achievements as compared with those counterparts from conventional routes [29,31,[33][34][35][36][37][38][39][40]. Despite of that, these MOFs-derived magnetic carbon-based composites still suffer from some undesirable drawbacks.…”