Long-Range Uniform SiCO Beaded Carbon Fibers for Efficient Microwave Absorption.

Area of Science:

• Materials Science
• Nanotechnology
• Composite Materials

Background:

• Developing advanced materials for efficient microwave absorption is crucial.
• Micro-nanocomposite structures offer unique properties for electromagnetic applications.
• Carbon fibers modified with ceramic nanoparticles show potential for electromagnetic interference shielding.

Purpose of the Study:

• To fabricate silicon carbide (SiC) and oxide beaded carbon fibers for the first time.
• To investigate the micro-nanocomposite structure and microwave absorption performance of these novel fibers.
• To elucidate the mechanism behind their efficient microwave energy dissipation.

Main Methods:

• Facile and stable electrospinning and temperature treatment process.
• Characterization using X-ray Diffraction (XRD), X-ray Photoelectron Spectroscopy (XPS), and High-Resolution Transmission Electron Microscopy (HRTEM).
• Electromagnetic performance evaluation and modified Drude-Lorentz model simulation.

Main Results:

• Successfully fabricated SiC and oxide beaded carbon fibers with a unique micro-nanocomposite structure.
• Achieved excellent microwave absorption with a minimum reflection loss of -58.53 dB and an effective absorption bandwidth of 5.92 GHz.
• Identified dipole relaxation and hopping migration of localized electrons as key mechanisms for microwave energy decay.

Conclusions:

• SiC and oxide beaded carbon fibers demonstrate significant promise for microwave absorption applications.
• The fabrication strategy provides a novel route for producing micro-nanocomposite structures.
• The unique structure and properties of these fibers open new avenues for advanced material design.