Melanin-like nanofibers with highly ordered structures achieve ultrahigh specific electromagnetic interference...

Area of Science:

• Materials Science
• Polymer Chemistry
• Electromagnetics

Background:

• High-performance electromagnetic shielding materials require precise structural design.
• Conventional materials face challenges in balancing performance and processability.
• Intrinsically conjugated polymers with enhanced processability are highly sought after.

Purpose of the Study:

• To engineer bioinspired polymers with highly ordered microstructures for electromagnetic shielding.
• To explore the microwave absorption properties of novel melanin-like nanofibers.
• To demonstrate the potential of melanin-like polymers in the microwave spectrum.

Main Methods:

• Utilized a 5, 6-dihydroxyindole ring tetramer framework to construct melanin-like nanofibers.
• Tuned π-π stacking to achieve highly ordered polymer microstructures.
• Fabricated melanin-like aerogels for microwave absorption testing.

Main Results:

• Achieved a maximum microwave reflection loss of -68.87 dB.
• Obtained an effective absorption bandwidth of 5.25 GHz.
• Demonstrated a specific electromagnetic interference (EMI) shielding efficiency of 47909.9 dB cm²/g in the X-band.

Conclusions:

• Successfully extended melanin-like polymers into the microwave spectrum.
• Melanin-like aerogels exhibit superior microwave absorption and EMI shielding performance.
• Engineered bioinspired polymers show significant potential for electromagnetic field applications.