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Tailored Multi-Band Microwave Absorption Performance via Entropy Engineering in Spinel Ferrite/Carbon Nanofiber
Shiping Shao1, Shuzhi Xing1, Ke Bi2
1Key Laboratory for Liquid-Solid Structural Evolution and Processing of Materials Ministry of Education, Shandong University, Jinan, 250061, P. R. China.
Small (Weinheim an Der Bergstrasse, Germany)
|April 15, 2025
Summary
Entropy engineering creates novel spinel ferrite/carbon composite nanofibers for advanced electromagnetic microwave absorption (EMA). These materials offer superior multi-band absorption, overcoming limitations of conventional EMA materials.
Area of Science:
- Materials Science
- Nanotechnology
- Electromagnetism
Background:
- Developing electromagnetic microwave absorption (EMA) materials with broad frequency compatibility is challenging.
- Conventional materials struggle with multi-band attenuation due to imbalanced dielectric and magnetic properties.
Purpose of the Study:
- To present a novel entropy engineering strategy for fabricating spinel ferrite/carbon composite nanofibers.
- To enhance multi-band microwave absorption properties using customized atomic species.
Main Methods:
- Combined electrospinning and heat-treatment methods were employed.
- Entropy engineering was utilized to tailor atomic species in (Mn,Ni,Zn,Co)Fe2O4/C nanofibers.
Main Results:
- Spinel ferrite/carbon composite nanofibers demonstrated enhanced multi-band absorption.
- (Mn0.05Ni0.45Zn0.05Co0.45)Fe2O4/C nanofibers achieved optimal reflection loss of -54.62 dB and effective absorption bandwidth of 7.28 GHz.
- (Mn0.25Ni0.25Zn0.25Co0.25)Fe2O4/C nanofibers exhibited tunable multi-band absorption from 3.84-18 GHz.
Conclusions:
- Entropy engineering offers an innovative strategy for tailoring multi-band EMA materials.
- The developed nanofibers provide flexible and tunable absorption capabilities.
- This approach addresses the limitations of conventional microwave absorbers.
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