Enhanced Electromagnetic Wave Absorption of SiOC/Porous Carbon Composites

Area of Science:

• Materials Science
• Nanotechnology
• Ceramic Engineering

Background:

• Carbon-based materials are extensively studied for electromagnetic (EM) wave absorption due to their high surface area and low density.
• Developing efficient and cost-effective EM wave absorbers remains a key challenge in materials science.

Purpose of the Study:

• To synthesize novel porous carbon/SiOC ceramic composites (porous C/sp-SiOC) for enhanced microwave absorption.
• To investigate the influence of SiOC content on the microstructure and EM wave absorption properties of the composites.
• To explore a green chemistry approach for developing high-performance microwave absorption materials.

Main Methods:

• Preparation of porous C/sp-SiOC composites using a melt-blending-phase separation route with pitch and polysilylacetylene (PSA).
• Pyrolysis of the precursor mixture to form SiOC ceramic micro-spheres within porous carbon matrices.
• Characterization of microstructural evolution and adjustment of SiOC content to optimize wave absorption.

Main Results:

• Successfully fabricated porous C/sp-SiOC composites with tunable microstructures.
• Achieved a minimum reflection loss of -56.85 dB, indicating strong EM wave absorption.
• Obtained an effective absorption bandwidth exceeding 4 GHz at a minimal thickness of 1.39 mm.

Conclusions:

• The synergistic effects of unique porous structure, strong interfacial polarization, and optimized impedance matching contribute to excellent absorption performance.
• Porous C/sp-SiOC composites represent a promising class of materials for high-performance microwave absorption applications.
• This research offers an innovative and practical route for developing green and efficient EM wave absorbers.