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Flower-like Multi-Shell Hollow Microsphere Enhances Dielectric-Magnetic Synergy for Efficient Microwave Absorption in
Renquan Wu1, Yijing Sun2, Xuzhou Jiang3
1School of Materials and Southern Marine Science and Engineering Guangdong Laboratory (Zhuhai), Sun Yat-Sen University, Shenzhen 518107, China.
ACS Applied Materials & Interfaces
|January 30, 2026
Summary
Flower-like multi-shell hollow microspheres made of NiO/Co3O4 heterostructures exhibit excellent C-band microwave absorption. These materials achieve significant reflection loss and broad absorption bandwidth, ideal for radar stealth and communication interference reduction.
Area of Science:
- Materials Science
- Electromagnetics
- Nanotechnology
Background:
- Efficient microwave absorption in the C-band (4-8 GHz) is crucial for wireless communication and radar stealth.
- Developing novel materials with enhanced absorption properties is an ongoing research area.
Purpose of the Study:
- To fabricate and characterize flower-like multi-shell hollow microspheres (FMSHS) composed of NiO/Co3O4 heterostructures.
- To evaluate the microwave absorption performance of FMSHS in the C-band.
- To elucidate the mechanisms behind the superior microwave absorption properties.
Main Methods:
- Sequential template method combined with an ion competition strategy for FMSHS fabrication.
- Experimental measurement of microwave absorption performance (reflection loss, absorption bandwidth).
- Analysis of electromagnetic properties and structural characteristics.
Main Results:
- FMSHS demonstrated excellent C-band microwave absorption performance.
- A reflection loss of -71.40 dB at 6.80 GHz was achieved with a thickness of 3.4 mm.
- An effective absorption bandwidth of 6.48 GHz was obtained.
Conclusions:
- The FMSHS exhibit superior microwave absorption due to enhanced magnetic-dielectric synergistic effects and improved impedance matching.
- The multi-shell hollow structure and flower-like morphology contribute to efficient microwave energy dissipation.
- This study offers valuable insights for designing high-performance C-band microwave absorbing materials.
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