Multifunctional Magnetic Ti₃C₂T_x MXene/Graphene Aerogel with Superior Electromagnetic Wave Absorption Performance

Abstract

Ingenious microstructure design and a suitable multicomponent strategy are still challenging for advanced electromagnetic wave absorbing (EMA) materials with strong absorption and a broad effective absorption bandwidth (EAB) at thin sample thickness and low filling level. Herein, a three-dimensional (3D) dielectric Ti3C2T x MXene/reduced graphene oxide (RGO) aerogel anchored with magnetic Ni nanochains was constructed via a directional-freezing method followed by the hydrazine vapor reduction process. The oriented cell structure and heterogeneous dielectric/magnetic interfaces benefit the superior absorption performance by forming perfect impedance matching, multiple polarizations, and electric/magnetic-coupling effects. Interestingly, the prepared ultralight Ni/MXene/RGO (NiMR-H) aerogel (6.45 mg cm–3) delivers the best EMA performance in reported MXene-based absorbing materials up to now, with a minimal reflection loss (RLmin ) of −75.2 dB (99.999 996% wave absorption) and a broadest EAB of 7.3 GHz. Furthermore, the excellent structural robustness and mechanical properties, as well as the high hydrophobicity and heat insulation performance (close to air), guarantee the stable and durable EMA application of the NiMR-H aerogel to resist deformation, water or humid environments, and high-temperature attacks.

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

“…Thirdly, the presence of NiCo@C composites and O vacancies cause dipole polarization in face of an external magnetic field, which promotes the loss of incident EMW. Furthermore, the eddy current loss and resonance loss caused by the presence of NiCo alloy are main sources of the magnetic loss [ 73 ]. In addition, as shown in Table 1 , the composite absorber prepared in this study has better overall absorption performance than other composites.…”

Carbon-Based MOF Derivatives: Emerging Efficient Electromagnetic Wave Absorption Agents

“…In high frequency range, if the polarization–relaxation process cannot catch up with the changes of alternating electric field, this process will be lossy. Typical, polarization–relaxation processes include the interfacial polarization–relaxation, dipole polarization–relaxation, ionic polarization–relaxation, and electronic polarization–relaxation [ 74 – 76 ]. The interfacial polarization–relaxation is attributed to the heterogeneous charge distribution in defects, heterojunctions, and phase interfaces [ 77 ].…”

First-Principles Density Functional Theory Calculations of Bilayer Membranes Heterostructures of Ti3C2T2 (MXene)/Graphene and AgNPs

“…This hybrid system has the potential to operate as electrode material in electrochemical storage applications due to its fast diffusion and transport of electrolyte ions, high metallic conductivity, and enhanced stability. Such nano-engineered MXene/graphene composites have been used for membrane desalination and water treatment [ 23 , 24 ], as well as for electromagnetic wave shielding applications [ 25 ]. In addition to a high surface-to-value ratio and enhanced mechanical strength, MXene/graphene heterostructures provide the coexistence of two types of surfaces which can be beneficial for desalination purposes.…”