期刊
JOURNAL OF MATERIALS CHEMISTRY C
卷 9, 期 16, 页码 5505-5514出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/d1tc00455g
关键词
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资金
- China Postdoctoral Science Foundation [2020M671843]
- Fundamental Research Funds for the Central Universities [JZ2020HGQB0219]
- Major Project of Science and Technology Innovation 2025 in Ningbo City, China [2020Z062]
- Huaian Transformation Project of Sci-tech Achievement [HA201907]
- Grant Project of Shenzhen Microgate Technology Co. Ltd
A new three-step method has been developed to enhance the microwave absorption properties of metal-organic framework derived materials at low thickness, achieving a broad effective absorption bandwidth and offering a novel approach for designing composite materials.
Broadband microwave absorption at low thickness still remains a challenge for most microwave absorbing materials derived from metal-organic frameworks. Herein, a three-step route, including the oxidation of Prussian blue microcubes, polymerization of phenolic resin on Fe2O3 microcubes and controllable carbothermal reduction of Fe2O3@resin, has been developed to achieve simultaneous enhancement of complex permittivity and permeability, in order to promote reflection loss performance at low thickness. It has been proved that different carbothermal reduction environments generated by different resin contents would have a direct effect on the composition and microstructures of the reduced products. In detail, irregular particles of reduced products tend to grow up and connect with each other with increasing resin content. With low resin content, the reduced products (CR-0.2 and CR-0.4) consist of Fe3O4, FeO and Fe. With high resin content, the reduced products (CR-0.6 and CR-0.8) are composed of Fe3O4, Fe, Fe3C and partially graphitic carbon. A higher reduction degree endows CR-0.6 and CR-0.8 with stronger attenuation ability, including conduction loss provided by metallic Fe and graphitic carbon frameworks, enhanced polarization loss generated among multiple interfaces and magnetic loss produced by Fe and Fe3O4. Owing to the good balance between electromagnetic attenuation and impedance matching, a broad effective absorption bandwidth of 5.44 GHz can be reached at only 1.5 mm for CR-0.6. Our findings may pave a new way for realizing broadband microwave absorption at low thickness and offer novel insights for designing the composition and structure of MOF-derived materials.
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