Electrostatic self-assembly sandwich-like 2D/2D NiFe-LDH/MXene heterostructure for strong microwave absorption

Area of Science:

• Materials Science
• Nanotechnology
• Electromagnetism

Background:

• MXene exhibits high electromagnetic wave attenuation but suffers from self-stacking and excessive conductivity, hindering its application.
• Developing strategies to control MXene's structure and properties is crucial for optimizing its performance.

Purpose of the Study:

• To engineer a novel NiFe layered double hydroxide (LDH)/MXene composite with a 2D/2D sandwich-like heterostructure.
• To address the challenges of self-stacking and impedance mismatch in MXene-based electromagnetic wave absorbers.

Main Methods:

• Fabrication of a NiFe-LDH/MXene composite via electrostatic self-assembly.
• Characterization of the material's structure and electromagnetic wave absorption properties.
• Analysis of absorption mechanisms including polarization and impedance matching.

Main Results:

• The NiFe-LDH acted as an intercalator, preventing MXene self-stacking and optimizing impedance matching.
• A minimum reflection loss (RLmin) of -58.2 dB was achieved at 2 mm thickness and 20 wt% loading.
• Multiple reflection, dipole/interfacial polarization, and synergistic dielectric/magnetic losses contributed to the absorption mechanism.

Conclusions:

• The 2D/2D sandwich heterostructure design is an effective strategy to enhance MXene-based electromagnetic wave absorber performance.
• The NiFe-LDH/MXene composite demonstrates excellent absorption properties and potential for radar cross-section reduction.