物理化学学报2026，Vol.42Issue(7)：245-260,16.DOI:10.1016/j.actphy.2026.100290
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
摘要
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.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Key words
Metal organic frameworks/Covalent organic frameworks/Electromagnetic wave absorption/Broadband/Density functional theory分类
化学化工引用本文复制引用
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):245-260,16.基金项目
本研究得到国家自然科学基金项目(52173267)和江苏省研究生科研与实践创新计划项目(KYCX24_XZ001)的资助 （52173267）
