Multifunctional Magnetic Ti₃C₂T MXene/Graphene Aerogel with Superior Electromagnetic Wave Absorption Performance

Area of Science:

• Materials Science
• Nanotechnology
• Electromagnetics

Background:

• Developing advanced electromagnetic wave absorbing (EMA) materials with strong absorption and broad effective absorption bandwidth (EAB) at thin sample thicknesses and low filling levels remains a significant challenge.
• Existing materials often struggle to balance impedance matching, absorption mechanisms, and structural integrity.

Purpose of the Study:

• To design and synthesize a novel 3D aerogel composite for superior EMA performance.
• To investigate the structure-property relationships governing the electromagnetic wave absorption capabilities of the composite.

Main Methods:

• Fabrication of a 3D Ti3C2Tx MXene/reduced graphene oxide (RGO) aerogel anchored with Ni nanochains using directional-freezing and hydrazine vapor reduction.
• Characterization of the aerogel's microstructure, composition, and electromagnetic properties.
• Evaluation of EMA performance, including reflection loss (RL) and effective absorption bandwidth (EAB).

Main Results:

• The ultralight Ni/MXene/RGO (NiMR-H) aerogel demonstrated an outstanding minimal RL of -75.2 dB (99.999996% wave absorption) and the broadest EAB of 7.3 GHz among reported MXene-based absorbers.
• The oriented cell structure and heterogeneous dielectric/magnetic interfaces facilitated perfect impedance matching, multiple polarization losses, and electric/magnetic-coupling effects.
• The aerogel exhibited excellent structural robustness, mechanical properties, hydrophobicity, and heat insulation.

Conclusions:

• The developed NiMR-H aerogel represents a significant advancement in EMA materials, offering superior performance and durability.
• The unique architecture and composition enable efficient electromagnetic wave attenuation.
• The material shows great potential for stable and long-term EMA applications in demanding environments.