Robust Multisource Built-In Electric Fields in High-Entropy MXene-Derived Nitrides for Efficient Electromagnetic Wave...

Area of Science:

• Materials Science
• Nanotechnology
• Electromagnetics

Background:

• High-entropy MXene derivatives present opportunities for electromagnetic wave absorption materials.
• Constructing robust multisource built-in electric fields (BIEF) to enhance electromagnetic attenuation is challenging.

Purpose of the Study:

• Design high-entropy MXene-derived multicomponent nitrides for efficient electromagnetic absorption.
• Investigate the origin and regulation of BIEF for enhanced electromagnetic absorption.

Main Methods:

• Sequential oxidation and nitridation of TiVCrMoC3Tx precursor.
• Electron holography and theoretical calculations to analyze BIEF.
• Characterization of material phases, microstructures, and electromagnetic properties.

Main Results:

• High-entropy-driven phase transformation yielded complex phases and microstructures with abundant heterogeneous interfaces and defects.
• Multisource BIEF were identified, originating from dipoles and interfacial charge redistribution.
• Achieved minimum reflection loss of -52.02 dB and effective absorption bandwidth of 4.8 GHz at 2.0 mm thickness.

Conclusions:

• Developed a strategy to construct multisource BIEF for enhanced electromagnetic absorption.
• Demonstrated the potential of high-entropy MXene derivatives for advanced electromagnetic wave absorption materials.
• Highlighted the significance of BIEF in regulating polarization oscillations and dielectric response.