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Constructing macroporous C/Co composites with tunable interfacial polarization toward ultra-broadband microwave
Lei Wang1, Zhen Du1, Xiaoyu Bai1
1School of Materials Science and Engineering, Shaanxi Key Laboratory of Green Preparation and Functionalization for Inorganic Materials, Shaanxi University of Science and Technology, Xi'an 710021, PR China.
Journal of Colloid and Interface Science
|February 16, 2021
Summary
Optimizing the surface area of porous carbon/cobalt composites is key for advanced microwave absorbers. A surface area of ~340 m²g⁻¹ yields excellent performance with wide bandwidth and strong absorption at low filler loading.
Area of Science:
- Materials Science
- Nanotechnology
- Electromagnetics
Background:
- Porous carbon-based materials are effective microwave absorbers, balancing impedance matching and attenuation.
- Optimizing the surface area is crucial for enhancing microwave absorbing properties, but suitable values remain underexplored.
Purpose of the Study:
- To fabricate macroporous carbon/cobalt (C/Co) composites with optimized surface area for microwave absorption.
- To investigate the relationship between Brunauer-Emmett-Teller (BET) surface area and microwave absorbing performance.
Main Methods:
- Fabrication of macroporous C/Co composites via in situ carbonization of ZIF-67@SiO₂ precursors.
- Controlled removal of SiO₂ nanoparticles to tune the BET surface area.
- Characterization of microwave absorbing properties, including reflection loss (RL) and effective absorbing bandwidth (EAB).
Main Results:
- Macroporous C/Co composites were successfully synthesized with tunable BET surface area.
- The optimal BET surface area of ~340 m²g⁻¹ resulted in the best microwave absorbing performance.
- Maximum reflection loss reached -56.2 dB with an ultra-wide effective absorbing bandwidth of 9.0 GHz (9.0-18.0 GHz).
Conclusions:
- Optimized surface area is critical for achieving high-performance microwave absorbers.
- The fabricated macroporous C/Co composites demonstrate excellent microwave absorption capabilities at ultralow filler loading (10 wt%).
- This study provides valuable insights into designing efficient carbon-based microwave absorbing materials.
