Achieving Superior Electromagnetic-Absorbing Performances in the Hexagonal Flake BaFe₁₂O₁₉@PVDF Composites

Area of Science:

• Materials Science
• Nanotechnology
• Electromagnetism

Background:

• Composite materials combining magnetic and dielectric properties offer improved impedance matching and electromagnetic wave absorption.
• Core-shell structured composites are crucial for developing lightweight and highly effective electromagnetic-absorbing materials.

Purpose of the Study:

• To synthesize and characterize barium ferrite@PVDF (BaFe₁₂O₁₉@PVDF) core-shell composites.
• To investigate the influence of the BaFe₁₂O₁₉:PVDF mass ratio on shell thickness and electromagnetic absorption properties.
• To evaluate the potential of these composites for electromagnetic wave absorption in 5G communications.

Main Methods:

• Hydrothermal synthesis of uniform hexagonal flake barium ferrite (BaFe₁₂O₁₉).
• Sol-gel synthesis of BaFe₁₂O₁₉@PVDF core-shell composites.
• Controlled adjustment of BaFe₁₂O₁₉:PVDF mass ratio to tune shell thickness and optimize electromagnetic absorption.

Main Results:

• Optimized impedance matching at 13.4 GHz was achieved with a BaFe₁₂O₁₉@PVDF shell thickness of 19.64 nm (mass ratio 1:1.0).
• A minimum reflection loss (RL_min) of -58.04 dB and an effective absorption bandwidth (EAB) of 5.53 GHz were observed at 1.5 mm thickness.
• A maximum EAB of 15.90 GHz was achieved with a mass ratio of 1:1.2 and a thickness of 3.5 mm, covering 99.38% of the 2-18 GHz range.

Conclusions:

• BaFe₁₂O₁₉@PVDF core-shell composites demonstrate superior electromagnetic wave absorption capabilities.
• The tunable shell thickness allows for optimization of impedance matching and absorption performance.
• These composites are highly promising candidates for electromagnetic wave absorption applications, particularly in 5G communications.