Preparation of MXene/BN Composites with Adjustable Microwave Absorption Performance

Area of Science:

• Materials Science
• Nanotechnology
• Electromagnetics

Background:

• Developing high-efficiency microwave absorbents compatible with high-temperature applications remains a significant challenge.
• Existing materials often compromise between microwave absorption capabilities and thermal stability.

Purpose of the Study:

• To create novel MXene/boron nitride (BN) composites with tunable microwave absorption performance (MAP).
• To investigate the high-temperature resistance and microwave absorption characteristics of these composites.

Main Methods:

• A facile synthesis method was employed to produce serial MXene/BN-zxy composites with varying weight ratios.
• The microwave absorption performance and thermal stability of the composites were systematically evaluated.

Main Results:

• The MXene/BN composites exhibited adjustable MAP, with a minimum reflection loss (RL) of -20.94 dB achieved for MXene/BN-101 at 4.0 mm thickness.
• An effective attenuation bandwidth (RL < -10 dB) of 9.71 GHz was recorded.
• The composites demonstrated supercapacitance-like structures and maintained performance above 900°C.
• Analysis indicated that material attenuation, not impedance mismatch, was the critical factor for MAP.

Conclusions:

• The developed MXene/BN composites offer a promising solution for high-efficiency, high-temperature microwave absorbents.
• The tunable MAP and excellent thermal stability make them suitable for demanding applications, including heating components.