Authors
Zhongjing Shen, Ruiyang Tan, Ping Chen, Xinyu Xu, Shuai Yuan, Xuefeng Wang
Published in
ACS applied materials & interfaces. Aug 17, 2026. Epub Aug 17, 2026.
Abstract
The in situ growth of carbon nanotubes (CNTs) on metal-organic framework (MOF)-derived carbon matrices offers a promising route for lightweight and high-performance electromagnetic wave (EMW) absorbers. However, achieving controllable CNT growth while maintaining balanced dielectric properties and impedance matching remains a major challenge. Herein, Fe-citrate is introduced as an integrated precursor that simultaneously functions as a Fe source, chelating ligand, and carbon feedstock, controlling in situ growth of CNTs without external carbon sources. During pyrolysis, in situ-formed Fe nanoparticles catalyze the formation of high-aspect-ratio CNT networks on N-doped carbon (NC) derived from zeolitic imidazolate framework-L (ZIF-L), a Zn-based MOF. By regulating the Fe-citrate content, the density and morphology of CNTs can be precisely tailored, thereby tuning the dielectric response and impedance matching characteristics of the resulting Fe@NC-CNT composites. Benefiting from the optimized balance between conductive attenuation and impedance matching, the Fe@NC-CNT composites achieve a minimum reflection loss of -60.4 dB at 12.5 wt % and a maximum effective absorption bandwidth of 7.6 GHz at 10 wt %. This work establishes a versatile strategy for engineering CNT networks in MOF-derived materials and provides insights into the structure-electromagnetic property relationship governing broadband microwave absorption.
PMID:
42607153
Bibliographic data and abstract were imported from PubMed on 18 Aug 2026.
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