Multifunctional ultralight Fe₃O₄/α-Fe/bamboo composites for high-performance microwave absorption, hydrophobicity,...

Area of Science:

• Materials Science
• Nanotechnology
• Biomass Valorization

Background:

• Lightweight, sustainable electromagnetic wave (EMW) absorbing materials are crucial for advanced electronics.
• Existing materials often face limitations in performance, weight, or environmental impact.
• Biomass-derived materials offer a sustainable platform for multifunctional composites.

Purpose of the Study:

• To develop ultralight, multifunctional Fe3O4/α-Fe/bamboo-derived magnetic carbon composites.
• To investigate the microwave absorption, electromagnetic interference (EMI) shielding, and thermal properties.
• To explore a green and scalable fabrication strategy using biomass.

Main Methods:

• Fabrication via delignification, precursor impregnation, and in-situ pyrolysis of bamboo.
• Characterization of hierarchical porous architecture and magnetic nanoparticle distribution.
• Evaluation of microwave absorption, EMI shielding, hydrophobicity, and thermal response.

Main Results:

• MB-800 composite achieved -71.4 dB reflection loss at 9.36 GHz with a 1.7 mm thickness and 5.76 GHz absorption bandwidth.
• Demonstrated significant reduction in monostatic radar cross-section, indicating strong radar-stealth capability.
• Exhibited low density (0.47 g/cm³), high hydrophobicity (117.7°), and rapid Joule-heating response.

Conclusions:

• The developed bamboo-derived magnetic carbon composites show excellent EMW absorption and radar stealth.
• The hierarchical porous structure and magnetic nanoparticles synergistically enhance performance.
• Presents a sustainable and scalable approach for multifunctional materials in electromagnetic stealth, EMI shielding, and thermal management.