Lightweight MXene Composite Films with Hollow Egg-Box Structures: Enhanced Electromagnetic Shielding Performance...

Area of Science:

• Materials Science
• Nanotechnology
• Electromagnetics

Background:

• MXene is a key material for electromagnetic interference (EMI) shielding.
• High reflectivity of pure MXene leads to secondary EMI pollution.
• Need for improved EMI shielding materials with reduced reflectivity.

Purpose of the Study:

• To develop MXene composite films with a hollow egg-box structure.
• To decrease electromagnetic reflectivity and enhance EMI shielding effectiveness.
• To improve water resistance and lightweight properties of MXene films.

Main Methods:

• Fabrication of MXene composite films with a unique hollow egg-box structure.
• Characterization of structural, electromagnetic, and water resistance properties.
• Evaluation of electromagnetic interference shielding effectiveness (EMI SE) and specific shielding effectiveness per thickness and density (SSE/t).

Main Results:

• Reflectivity (R) decreased from 0.98 to 0.54, and absorbance (A) increased from 0.02 to 0.45.
• Achieved a peak EMI SE of 69.19 dB and peak SSE/t of 27,888 dB cm²/g.
• Demonstrated improved water resistance compared to pure MXene films.

Conclusions:

• The hollow egg-box structure effectively reduces MXene's electromagnetic reflectivity and secondary pollution.
• MXene composite films exhibit superior EMI shielding performance and water resistance.
• These films are promising for advanced, lightweight EMI shielding devices.