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Flexible SiC/Si3N4 Composite Nanofibers with in Situ Embedded Graphite for Highly Efficient Electromagnetic Wave
Peng Wang1, Laifei Cheng1, Yani Zhang1
1Science and Technology on Thermostructural Composite Materials Laboratory and State Key Laboratory of Solidification Processing, Northwestern Polytechnical University , 710072 Xi'an, China.
ACS Applied Materials & Interfaces
|August 12, 2017
Summary
Silicon carbide/silicon nitride composite nanofibers with embedded graphite exhibit excellent electromagnetic wave absorption. Processing conditions like annealing temperature and atmosphere precisely control performance, offering tunable absorption bandwidth and minimal reflection loss.
Area of Science:
- Materials Science
- Nanotechnology
- Electromagnetics
Background:
- Developing advanced materials for efficient electromagnetic (EM) wave absorption is crucial for electronic device protection and stealth technologies.
- Silicon carbide (SiC) and silicon nitride (Si3N4) are known for their thermal stability and potential EM wave absorbing properties.
- In situ incorporation of graphite can enhance dielectric properties and EM wave absorption.
Purpose of the Study:
- To prepare SiC/Si3N4 composite nanofibers with embedded graphite for high-performance EM wave absorption.
- To investigate the correlation between processing parameters, microstructure, and EM wave absorption characteristics.
- To explore the potential applications of these nanofibers as EM wave absorbing reinforcements.
Main Methods:
- Electrospinning of precursor materials to form nanofibers.
- Polymer pyrolysis and subsequent annealing under controlled atmospheres (Ar, N2) at high temperatures (1300 °C).
- Characterization of microstructure and systematic evaluation of electromagnetic wave absorption performance (reflection loss, effective absorption bandwidth).
Main Results:
- SiC/Si3N4 composite nanofibers with in situ embedded graphite were successfully synthesized.
- Annealing conditions significantly influenced the EM wave absorption capability and effective absorption bandwidth (EAB).
- Optimized nanofibers achieved a minimum reflection loss (RL) of -57.8 dB and an EAB of 5.5 GHz (annealed in Ar), and an EAB of 6.4 GHz (annealed in N2).
- High EM wave absorption is attributed to dielectric loss from interfacial and dipole polarization.
Conclusions:
- The developed SiC/Si3N4 composite nanofibers demonstrate superior EM wave absorption performance in the gigahertz frequency range.
- Processing parameters, particularly annealing atmosphere and temperature, offer effective control over absorption properties.
- These composite nanofibers show significant potential as reinforcing agents to enhance the EM wave absorption capabilities of various polymers and ceramics.
