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Ethanol-Mediated Synthesis of Defective Zn-Benzimidazole Polymer Derived N-Doped Carbon Materials and Microwave Absorption Properties
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DOI：10.1016/j.carbon.2026.121950.png)
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Abstract
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• The as-prepared N-doped porous carbon microwave absorption material derived from Zn-benzimidazole (Zn-BIM) exhibits excellent electromagnetic wave absorption performance, achieving a minimum reflection loss (RLmᵢn) of -57.33 dB with an effective absorption bandwidth (EAB) of 8.72 GHz at a matching thickness of only 2.41 mm. • The effects of Zn2+ /BIM molar ratio and concentrated NH3·H2O dosage on the microstructure and electromagnetic wave absorption performance of Zn-BIM derived carbon are systematically investigated. • The ethanol solvent and strong alkaline conditions facilitate the formation of low-crystallinity Zn-BIM frameworks with abundant defects. Such structure endows the material with abundant defect sites, heterogeneous interfaces and porous structures, thereby enhance its electromagnetic wave absorption capability. • After high-temperature pyrolysis, the Zn-BIM derived N-doped porous carbon effectively optimizes impedance matching and strengthens dielectric loss, realizing synergistic regulation of microwave absorption performance through impedance matching, dipole polarization, interfacial polarization and conductive loss.
Keywords:
Zn-BIM polymer
Nitrogen-doped carbon-based materials
Microwave absorption
Dielectric loss
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11.6
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2.0W
Citations:
10.5W
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