物理化学学报 >> 2026, Vol. 42 >> Issue (8): 100313.doi: 10.1016/j.actphy.2026.100313

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双金属有机框架衍生蜂窝状BiCo@NC用于高效电磁波吸收

刘伟恒1, 罗驹华1,*(), 时家欢1, 兰笛2, 毛双双1, 谢宇3,*()   

  1. 1 盐城工学院材料科学与工程学院, 江苏 盐城 224051
    2 湖北汽车工业学院汽车材料学院, 湖北 十堰 442002
    3 南昌航空大学环境与化学工程学院, 江西 南昌 330063
  • 收稿日期:2026-03-08 修回日期:2026-04-24 录用日期:2026-04-27 发布日期:2026-06-11
  • 通讯作者: Email: ljh@ycit.edu.cn (罗驹华)xieyu_121@163.com (谢宇)

Honeycomb-like BiCo@NC composites derived from bimetallic organic frameworks for high-efficiency electromagnetic wave absorption

Weiheng Liu1, Juhua Luo1,*(), Jiahuan Shi1, Di Lan2, Shuangshuang Mao1, Yu Xie3,*()   

  1. 1 School of Materials Science and Engineering, Yancheng Institute of Technology, Yancheng 224051, Jiangsu Province, China
    2 School of Automotive Materials, Hubei University of Automotive Technology, Shiyan 442002, Hubei Province, China
    3 College of Environment and Chemical Engineering, Nanchang Hangkong University, Nanchang 330063, Jiangxi Province, China
  • Received:2026-03-08 Revised:2026-04-24 Accepted:2026-04-27 Published:2026-06-11
  • Contact: Email: ljh@ycit.edu.cn (Juhua Luo)xieyu_121@163.com (Yu Xie)

摘要:

为了解决电磁波(EMW)污染问题,开发高效的电磁波吸收(EMWA)材料仍然是一项挑战。采用聚合物辅助溶胶-凝胶法制备铋钴双金属有机框架,并在高温下碳化得到蜂窝状BiCo@氮掺杂碳(NC)复合材料。同时,碳化温度会影响材料的磁性和电导率。随着温度的升高,BiCo@NC复合材料的EMWA性能先升高后降低。在750 ℃碳化温度下、厚度为2.40 mm时,最小反射损耗值达到−47.29 dB,有效吸收带宽值为6.72 GHz (11.28–18.00 GHz)。优异的EMWA性能源于介电损耗与磁损耗的协同作用、多次反射和散射以及良好的阻抗匹配。密度泛函理论计算证实界面极化增强了EMWA性能,雷达散射截面计算结果表明该复合材料具有实际应用潜力。本研究为制备高效的碳基EMWA材料提供了新思路。

关键词: 电磁波吸收, 蜂窝状结构, 聚合物辅助溶胶-凝胶法, 密度泛函理论

Abstract:

To address the electromagnetic wave (EMW) pollution, developing efficient EMW-absorbing (EMWA) materials is still challenging. A bismuth-cobalt bimetallic organic framework was prepared by a polymer-assisted sol-gel method, and carbonized at high-temperature to obtain honeycomb-like BiCo@nitrogen-doped carbon (NC) composites. The carbonization temperature affects both the magnetic properties and electrical conductivity. With increasing temperature, the EMWA performance of BiCo@NC composites first increases and then decreases. At 750 ℃, the minimum reflection loss value is −47.29 dB at 2.40 mm, and the effective absorption bandwidth value is 6.72 GHz (11.28–18.00 GHz). The excellent EMWA performance is caused by the combined dielectric and magnetic loss synergy, multiple reflection and scattering, and impedance matching. Density functional theory calculations confirm that interfacial polarization enhances the EMWA performance, and radar cross-section calculations show the composites' practical application potential. This study offers a novel approach for high-efficiency carbon-based EMWA materials.

Key words: Electromagnetic wave absorption, Honeycomb structure, Polymer-assisted sol-gel method, Density functional theory