共价有机框架衍生的Fe3C/NC/TiO2异质结构用于高性能电磁波吸收

doi:10.1016/j.actphy.2026.100290

摘要/Abstract

摘要：

异质结构设计是协同提升电磁波吸收材料性能的关键方法。然而，制备兼具高吸收强度与宽带响应的共价/金属有机框架(COFs/MOFs)衍生的复合材料，仍面临着重大挑战。本研究通过溶剂热法和高温碳化法成功制备了Fe₃C/NC/TiO₂复合材料。异质结构形成的内建电场实现了多重损耗机制的协同作用。样品的吸收性能随成分的变化呈现先升后降的趋势，在2.57 mm匹配厚度下取得−55.79 dB的最小反射损耗值，有效吸收带宽达5.44 GHz (10.40–15.84 GHz)。优异的性能源于界面极化、磁损耗与介电损耗等多重机制的协同效应，共同提升了阻抗匹配与损耗能力。密度泛函理论表明，这两种材料本质上都是导电的。在形成异质结构后，电荷密度差分析揭示了电荷转移，表明它们之间的内建电场促进了电子传输。本研究提出了以MOFs/COFs衍生物为核心的合成策略，为设计具有强吸收和宽频带特性的高性能电磁波吸收材料提供了新思路。

关键词: 金属有机框架, 共价有机框架, 电磁波吸收, 宽带, 密度泛函理论

Abstract:

Heterostructure design serves as a critical approach for synergistically enhancing the performance of electromagnetic wave absorption (EMWA) materials. Nevertheless, creating composite materials, derived from covalent/metal-organic frameworks (COFs/MOFs) that possess both excellent absorption intensity and broadband response remains a substantial challenge. In this work, the Fe₃C/NC/TiO₂ composites were successfully prepared via a solvothermal route coupled with subsequent high-temperature carbonization. Built-in electric field within the heterostructure enables synergy of multiple loss mechanisms. The EMWA performance of the samples initially ascended and subsequently declined with variations in composition. In particular, the sample achieved a minimum reflection loss value of −55.79 dB at a matching thickness of 2.57 mm, with an effective absorption bandwidth value of 5.44 GHz (10.40–15.84 GHz). The outstanding performance can be ascribed to the synergistic effects of multiple loss mechanisms, including interfacial polarization, magnetic loss, and dielectric loss, which jointly enhance the impedance matching characteristics and dissipation properties. Density functional theory indicates that both materials are intrinsically conductive. Upon forming a heterostructure, charge density difference analysis reveals charge transfer, suggesting that the built-in electric field between them facilitates electron transport. This study outlines a synthetic strategy centered on MOFs/COFs derivatives, providing valuable avenue for the designing of high-performance EMWA materials with remarkable absorption and broadband coverage.

Key words: Metal organic frameworks, Covalent organic frameworks, Electromagnetic wave absorption, Broadband, Density functional theory

毛双双, 罗驹华, 韩冰洁, 时家欢, 谷俞稼. 共价有机框架衍生的Fe₃C/NC/TiO₂异质结构用于高性能电磁波吸收[J]. 物理化学学报, 2026, 42(7), 100290. doi: 10.1016/j.actphy.2026.100290

Shuangshuang Mao, Juhua Luo, Bingjie Han, Jiahuan Shi, Yujia Gu. Covalent organic framework-derived Fe₃C/NC/TiO₂ heterostructures for high-performance electromagnetic wave absorption[J]. Acta Phys. -Chim. Sin. 2026, 42(7), 100290. doi: 10.1016/j.actphy.2026.100290

链接本文: https://www.whxb.pku.edu.cn/CN/10.1016/j.actphy.2026.100290

https://www.whxb.pku.edu.cn/CN/Y2026/V42/I7/100290

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共价有机框架衍生的Fe₃C/NC/TiO₂异质结构用于高性能电磁波吸收

Covalent organic framework-derived Fe₃C/NC/TiO₂ heterostructures for high-performance electromagnetic wave absorption

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