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- Title
Enhanced microwave absorption of epoxy composite by constructing 3D Co–C–MWCNTs derived from metal organic frameworks.
- Authors
Fan, Huiyuan; Yao, Zhengjun; Zhou, Jintang; Yi, Pengshu; Wei, Bo; Lei, Lei; Mao, Yumeng
- Abstract
In this study, a magnetic/dielectric composite precursor is obtained by in situ growing zeolitic imidazolate framework-67 nanoparticles on the surface of acidified multi-walled carbon nanotubes (MWCNTs). After pyrolyzing the precursor in an argon atmosphere, a kind of nano-heterogeneous composite wave absorber was prepared. Subsequently, a new type of magnetic/dielectric wave-absorbing composite was prepared by heating and curing Co–C–MWCNTs and epoxy resin, and the properties of the composite were adjusted by changing the content of Co–C–MWCNTs. A variety of modern characterization methods were used to systematically study the micro-morphology, element composition and electromagnetic properties of the composite. The results show that after the combination of MWCNTs and Co–C particles with regular dodecahedron structure, a special synergistic effect appears. The addition of magnetic MOF derivatives not only improves the impedance matching characteristics of the composite and increases the magnetic loss mechanism, but also provides a new path for the transmission of electromagnetic waves because of its special pore structure and the three-dimensional network structure formed by cross-linking with MWCNTs. The interface polarization and multiple scattering effects greatly improve the attenuation efficiency of electromagnetic waves. In X-band (8–12 GHz), the Co–C–MWCNTs/EP composite with a loading of 17.5 wt% can achieve an effective absorption bandwidth of 2.38 GHz when the matching thickness is 1.6 mm. The combination of novel MOF-derived materials and traditional carbon materials is expected to provide new ideas for the design of composites with microwave absorption capabilities.
- Subjects
METAL-organic frameworks; ELECTROMAGNETIC waves; MICROWAVES; MAGNETIC flux leakage; IMPEDANCE matching; EPOXY resins
- Publication
Journal of Materials Science, 2021, Vol 56, Issue 2, p1426
- ISSN
0022-2461
- Publication type
Article
- DOI
10.1007/s10853-020-05365-0