无机材料学报2026，Vol.41Issue(2)：208-216,中插4,10.DOI:10.15541/jim20250177
3D网络结构粉煤灰微珠@碳纳米管微球的制备及吸波性能研究
3D Network-structured Fly Ash Microbeads@Carbon Nanotubes Composites for Electromagnetic Wave Absorption
摘要
Abstract
With rapid development of 5G communication and miniaturization of electronic devices,development of lightweight,broadband and high-efficiency electromagnetic wave absorbing materials has emerged as a critical solution to challenges posed by electromagnetic pollution and information leakage.However,traditional absorbing materials face significant limitations,such as high density,narrow absorption bandwidth and poor environmental compatibility,while the resource utilization of industrial solid waste provides an innovative path for the design of high-performance absorbing materials with both economic and ecological benefits.Here,magnetic fly ash(MFA)microbeads were derived from solid waste of coal-fired power plants through magnetic separation.Additionally,magnetic fly ash microbeads@carbon nanotubes(MFA@CNTs)composite wave-absorbing materials with a three-dimensional interpenetrating network structure were successfully prepared by chemical vapor deposition(CVD)using in situ-loaded Fe-based nanoparticles on surface of the MFA microbeads as catalysts.Microstructural characterization showed that the bamboo-like CNTs grown on surface of the MFA microbeads formed a porous structure by inter tubular winding and bridging with silicate framework.The composite material achieves a minimum reflection loss(RLmin)of-44.52 dB at 8.8 GHz(with a thickness of 2.99 mm)and an effective absorption bandwidth(EAB,RL<-10 dB)covering 4.72 GHz(with a thickness of 1.7 mm).The performance enhancement mechanism can be attributed to the following aspects.(1)The magnetic component(Fe3O4)in the MFA microbeads interacts with conductive network of the CNTs,thereby establishing a magneto-electrical coupling effect to optimize the impedance matching.(2)The defective structure of bamboo-like CNTs induces multiple polarized relaxation(including interfacial and dipole polarizations),significantly enhancing the dielectric loss.(3)The 3D porous network extends the propagation path of electromagnetic wave,thereby promoting multiple reflection and scattering loss.This study not only provides a new paradigm for high-value utilization of industrial solid waste,but also lays a theoretical and technical foundation for the design of lightweight and broadband wave-absorbing materials.关键词
粉煤灰微珠@碳纳米管微球/3D网络结构/电磁波吸收Key words
fly ash microbeads@carbon nanotube/3D network structure/electromagnetic wave absorption分类
通用工业技术引用本文复制引用
张晓民,仝粮语,高红洁,陈垿,闫虎虎,高阳..3D网络结构粉煤灰微珠@碳纳米管微球的制备及吸波性能研究[J].无机材料学报,2026,41(2):208-216,中插4,10.基金项目
陕西省重点研发计划项目(2024GX-YBXM-420) （2024GX-YBXM-420）
咸阳市科技局重点研发计划项目(2021ZDYF-GY-0034) （2021ZDYF-GY-0034）
西安建筑科技大学 2024 年大学生创新创业国家级项目(202410703063)Shaanxi Province Key Research and Development Program Project(2024GX-YBXM-420) （202410703063）
Xianyang City Science and Technology Bureau Key Research and Development Program Project(2021ZDYF-GY-0034) （2021ZDYF-GY-0034）
Xi'an University of Architecture and Technology 2024 National-level Undergraduate Innovation and Entrepreneurship Project(202410703063) （202410703063）
