Renewable, self-supporting bamboo-based composites for electromagnetic absorption and electrothermal management.

Area of Science:

• Materials Science
• Nanotechnology
• Environmental Science

Background:

• Electromagnetic wave pollution poses risks to human health and sensitive instruments.
• Biomass materials are increasingly explored for effective electromagnetic wave absorbers.
• Natural bamboo offers a sustainable and abundant raw material.

Purpose of the Study:

• To fabricate high-performance magnetic bamboo-based composites (BBCs) for electromagnetic wave absorption.
• To investigate the role of delignification pretreatment in enhancing BBC properties.
• To evaluate the electromagnetic wave absorption capabilities of the developed BBCs.

Main Methods:

• Utilized natural bamboo as the raw material.
• Applied a novel strategy involving delignification pretreatment, iron salt impregnation, and in-situ pyrolysis.
• Characterized the structural and electromagnetic properties of the fabricated BBCs.

Main Results:

• Successfully fabricated magnetic bamboo-based composites (BBCs) with improved hierarchical pore architecture.
• The BBC-1000 sample exhibited excellent electromagnetic wave absorption: minimum reflection loss of -57.6 dB at 2.1 mm thickness.
• Achieved a broad effective absorption bandwidth of 7.8 GHz (RL ≤ -10 dB).
• Demonstrated synergistic enhancement of dielectric and magnetic losses due to improved impedance matching and conductive framework.

Conclusions:

• Delignification pretreatment is crucial for optimizing bamboo's pore structure, enhancing magnetic nanoparticle dispersion, and improving electromagnetic wave absorption.
• The developed BBCs show significant potential as lightweight and efficient electromagnetic wave absorbers.
• CST simulations confirmed the material's effectiveness in radar wave attenuation, indicating broad applicability.