锚定策略诱导Ni-MOF@膨胀石墨复合材料的导电损耗以实现宽带微波吸收

doi:10.1016/j.actphy.2026.100301

摘要/Abstract

摘要：

金属有机框架(MOF)衍生物因其大比表面积和结构可调性，已成为电磁波吸收材料的候选者。然而，磁性MOF衍生物导电损耗不足及团聚问题严重制约了其应用。本文提出了一种新型导电网络构建工程与锚定策略，通过镍催化自组装及热处理工艺，设计出具有层状网格结构的Ni-MOF@碳纤维/膨胀石墨(EG)复合材料。具体而言，通过精确调控碳源与网格状EG，诱导游离碳构建了既可连接EG又能锚定MOF衍生物的导电网络。扫描电镜分析证实碳纤维连接EG层形成了更丰富的微导电网络。同时，碳纤维的锚定作用调控了阻抗匹配并激活界面诱导极化，电磁参数测试验证了该现象。因此，S-4样品的最小反射损耗(RL_min)达到−41.73 dB，最大有效吸收带宽(EAB_max)为5.12 GHz，匹配厚度仅1.48 mm，雷达散射截面显著降低39.58 dB m²。该工作为高性能电磁波吸收材料的导电网络构建工程与锚定技术应用提供了重要启示。

关键词: 导电损耗, 电磁波吸收, 团聚, 阻抗匹配, MOF衍生材料

Abstract:

Metal-organic framework (MOF) derivatives have become candidates for electromagnetic wave absorption materials due to their large specific surface area and structural tunability. However, the insufficient conductivity loss and agglomeration of magnetic MOF derivatives seriously hinder their application. Herein, a novel conductive network construction engineering and anchoring strategy is proposed to design Ni-MOF@carbon fibers/Expanded graphite (EG) composites with a layered grid structure using Ni-catalyzed self-assembly and heat treatment processes. Specifically, free carbon is promoted to form a conductive network connecting EG and anchoring MOF derivatives by meticulously controlling the carbon source and grid-like EG. SEM analysis confirmed that the carbon fibers connected the EG layers to form a richer conductive micronetwork. Simultaneously, the anchoring of the carbon fibers regulated the impedance matching and activated the interface-induced polarization, which was confirmed by electromagnetic parameters. Therefore, the RL_min of S-4 reached −41.73 dB, the EAB_max was 5.12 GHz, the matching thickness was only 1.48 mm, and the radar cross section value was greatly reduced 39.58 dB·m². This work provides meaningful insights into the potential applications of conductive network construction engineering and anchoring technology for high-performance electromagnetic wave absorbing materials.

Key words: Conductivity loss, Electromagnetic wave absorption, Agglomeration, Impedance matching, MOF-derived materials

冯仁威, 范聪敏, 兰笛, 刘澜翔, 何秦川, 王益群. 锚定策略诱导Ni-MOF@膨胀石墨复合材料的导电损耗以实现宽带微波吸收[J]. 物理化学学报, 2026, 42(8), 100301. doi: 10.1016/j.actphy.2026.100301

Renwei Feng, Congmin Fan, Di Lan, Lanxiang Liu, Qinchuan He, Yiqun Wang. Anchoring strategy-induced conductive loss in Ni-MOF@expanded graphite composites to achieve broadband microwave absorption[J]. Acta Phys. -Chim. Sin. 2026, 42(8), 100301. doi: 10.1016/j.actphy.2026.100301

链接本文: https://www.whxb.pku.edu.cn/CN/10.1016/j.actphy.2026.100301

https://www.whxb.pku.edu.cn/CN/Y2026/V42/I8/100301

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