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Controllable construction and microwave absorption properties of TCF/Co@NC composite nanofibers
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DOI：10.1016/j.actphy.2026.100306.png)
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Abstract
En 中文
Compositing magnetic nanoparticles onto one-dimensional (1D) porous carbon matrices is of significant research value. This strategy is essential for fabricating high-efficiency and functionally synergistic microwave absorbers. In this work, 1D carbon materials are derived from tubular porous fibers via hyper-crosslinked polymerization. These materials serve as precursors to construct a series of composite fibers coated with Co/Zn metal-organic frameworks (C-CCNFs@Co/Zn-MOFs). The coating process is optimized, and the regulatory mechanism of Zn2+ ions on MOF grain size is revealed. Subsequent carbonization yields magnetic nitrogen-doped carbon-encapsulated cobalt/tubular carbon nanofibers (TCF/Co@NC). The TCF/Co@NC possesses a porous core-shell architecture and 1D morphology with abundant hetero-interfaces. These features facilitate the establishment of conductive loss networks and multiple reflections, resulting in strong energy dissipation capabilities. By adjusting the Co/Zn molar ratio, the electromagnetic parameters of the composite fibers can be optimized, thereby modulating their microwave absorption performance. The as-prepared NCT-3 (Co/Zn = 1:1) achieves a minimum reflection loss (RLmin) of −55.5 dB at a thickness of 2.7 mm. Meanwhile, NCT-2 (Co/Zn = 3:1) exhibits an effective absorption bandwidth (EAB) of 7.3 GHz at 2.4 mm. This study provides a versatile and referable methodology for designing high-performance magnetic carbon-based microwave absorbing materials.
Keywords:
magnetic nanoparticles
porous carbon
microwave absorber
Co/Zn-MOFs
composite nanofibers
Journal
A
IF:
13.5
Papers:
110
Citations:
1