MoS₂ Lubricate-Toughened MXene/ANF Composites for Multifunctional Electromagnetic Interference Shielding

Area of Science:

• Materials Science
• Nanotechnology
• Electromagnetics

Background:

• Electromagnetic pollution is a growing concern, necessitating effective shielding solutions.
• Existing electromagnetic interference (EMI) shielding materials often face limitations in mechanical properties and reflection reduction.
• Ternary composites offer potential for synergistic improvements in material performance.

Purpose of the Study:

• To design and fabricate high-toughness EMI shielding composite films with reduced electromagnetic wave reflection.
• To investigate the synergistic effects of incorporating Molybdenum disulfide (MoS2) into MXene/aramid nanofibers (ANF) composites.
• To enhance mechanical performance, reduce secondary reflection, and improve photothermal conversion capabilities.

Main Methods:

• Fabrication of ternary MXene/ANF-MoS2 composite films with a nacre-like layered structure.
• Characterization of mechanical properties, including strain to failure and tensile strength.
• Evaluation of electromagnetic shielding effectiveness (EMI SE) and reflection shielding effectiveness (SE_R).
• Assessment of photothermal conversion efficiency and electric heating performance.

Main Results:

• Introduction of MoS2 significantly improved mechanical properties: strain to failure increased by ~53.5% and tensile strength by ~60% in one composition.
• MoS2 addition reduced reflection shielding effectiveness (SE_R) by up to ~22.2%, while enhancing overall EMI SE to 43.9 dB.
• The composite films demonstrated efficient photothermal conversion (~45 to 55 °C) and excellent electric heating performance with rapid temperature elevation and stability.

Conclusions:

• Ternary MXene/ANF-MoS2 composite films offer a promising solution for high-performance EMI shielding with enhanced mechanical robustness.
• The incorporation of MoS2 effectively mitigates secondary reflection and boosts photothermal conversion capabilities.
• These multifunctional films hold potential for diverse industrial applications requiring advanced electromagnetic shielding and thermal management.