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Flower-like bimetal-organic framework derived composites with tunable structures for high-efficiency electromagnetic
Jiajia Zheng1, Weiwei He1, Tianyi Hang1
1Key Laboratory of Urban Rail Transit Intelligent Operation and Maintenance Technology & Equipment of Zhejiang Province, College of Engineering, Zhejiang Normal University, Jinhua 321004, China.
Journal of Colloid and Interface Science
|August 23, 2022
Summary
Flower-like cobalt-nickel@carbon (CoNi@C) composites were synthesized for electromagnetic wave absorption (EWA). The CoNi@C composites demonstrated excellent microwave absorption performance, with a minimum reflection loss of -56.89 dB.
Area of Science:
- Materials Science
- Nanotechnology
- Electromagnetics
Background:
- High-performance functional composites with tunable nano/micro-structures are crucial for electromagnetic wave absorption (EWA).
- Bimetallic metal-organic frameworks (MOFs) offer a versatile platform for designing advanced composite materials.
Purpose of the Study:
- To fabricate flower-like electrically conductive and magnetic cobalt-nickel@carbon (CoNi@C) composites for efficient electromagnetic wave absorption.
- To investigate the influence of precursor ratios on the morphology and electromagnetic wave absorption properties of the CoNi@C composites.
Main Methods:
- Solvothermal method and pyrolysis were employed to synthesize CoNi@C composites from bimetallic MOFs.
- The precursor ratios were adjusted to control the morphological features and optimize electromagnetic wave absorption.
Main Results:
- Flower-like CoNi@C composites were successfully synthesized with tunable nano/micro-structures.
- The CoNi@C composites with a Co:Ni molar ratio of 1:2 achieved an optimal minimum reflection loss (RLmin) of -56.89 dB at 6.7 GHz.
- An effective absorption bandwidth of 4.7 GHz was observed, attributed to synergistic dielectric and magnetic losses and unique 3D interfaces.
Conclusions:
- The fabricated CoNi@C composites exhibit excellent electromagnetic wave absorption capabilities.
- These composites show significant potential as high-efficiency absorbers for electromagnetic protection applications.
- The tunable structures derived from MOFs provide a promising route for designing advanced microwave absorbing materials.
