TCF/Co@NC复合纳米纤维的可控制备及其微波吸收性能OA

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.