Electromagnetic porous lignocellulosic matrix composites: A green electromagnetic shielding material with high...

Area of Science:

• Materials Science
• Nanotechnology
• Green Chemistry

Background:

• Electromagnetic interference (EMI) shielding is crucial for modern electronics.
• Developing sustainable and high-performance EMI shielding materials is an urgent need.
• Wood's natural 3D porous structure offers potential for advanced material design.

Purpose of the Study:

• To create efficient and eco-friendly electromagnetic interference (EMI) shielding materials.
• To investigate the use of delignified wood as a matrix for magnetoelectric composites.
• To explore the synergistic effects of dielectric and magnetic losses for enhanced EMI shielding.

Main Methods:

• Fabrication of magnetoelectric lignocellulosic composites via in-situ polymerization of PEDOT and Fe3O4 within delignified wood.
• Characterization of the composite's conductivity, magnetic properties, and electromagnetic shielding effectiveness (SE).
• Evaluation of mechanical properties, including compressive and tensile strength.

Main Results:

• The Fe3O4/PEDOT@wood composite demonstrated excellent EMI shielding effectiveness (SE) up to 59.8 dB in the X-band.
• The material exhibited high conductivity (103 S/m) and good magnetism (26.7 emu/g).
• High SE_A/SE_T ratios (84.2%–95.7%) and significant mechanical strength (100.8 MPa compressive, 18.1 MPa tensile) were achieved.

Conclusions:

• The developed Fe3O4/PEDOT@wood composite offers a promising solution for high-efficiency EMI shielding.
• The synergistic effect of dielectric and magnetic losses in the wood-derived structure is key to its performance.
• This research provides a sustainable pathway for creating advanced EMI shielding materials from renewable resources.