3D core-shell Fe₃O₄@SiO₂@MoS₂ composites with enhanced microwave absorption performance.

Area of Science:

• Materials Science
• Nanotechnology
• Electromagnetics

Background:

• Developing advanced microwave-absorbing materials is crucial for electromagnetic interference (EMI) shielding.
• Ternary composites offer tunable electromagnetic properties through synergistic interactions.
• Core-shell structures provide unique advantages for material design and performance enhancement.

Purpose of the Study:

• To synthesize and characterize a 3D ternary core-shell Fe3O4@SiO2@MoS2 composite.
• To investigate the microwave absorption properties of the synthesized composite.
• To explore the structure-property relationships for high-performance microwave absorption.

Main Methods:

• Hydrothermal technique and modified Stöber method for composite synthesis.
• Characterization of structural and electromagnetic properties.
• Microwave absorption measurements including reflection loss (RL) and effective absorption bandwidth (EAB).

Main Results:

• Successfully synthesized Fe3O4@SiO2@MoS2 core-shell microspheres with raspberry-like Fe3O4 cores and flower-like MoS2 shells.
• Achieved a minimum RL of -62.98 dB at 1.83 mm thickness.
• Obtained an effective absorption bandwidth of 5.76 GHz (11.28–17.04 GHz) at 1.92 mm thickness.
• Demonstrated significantly enhanced microwave absorption compared to pure Fe3O4 and Fe3O4@SiO2.

Conclusions:

• The Fe3O4@SiO2@MoS2 composite exhibits excellent microwave absorption performance.
• The enhanced absorption is attributed to the synergistic effects of magnetic and dielectric components, optimized impedance matching, and unique structural design.
• The study presents a promising strategy for designing novel magnetic/dielectric composites for high-efficiency microwave absorption applications.