宽频段石墨烯/磁性颗粒异质结构电磁屏蔽与微波吸收材料及其衰减吸收机制

It is highly significant to develop high-performance broadband electromagnetic shielding and microwave absorption materials and fabricate high-efficient electromagnetic shielding thin films due to their scientific importance and great potential applications in information security and stealth technology. In this project, high dielectric loss materials combined with magnetic loss heterostructures will be designed to co-enhance the electromagnetic shielding and microwave absorption properties based on synthesis of graphene/magnetic heterostructures and related modification on structure and morphology, aiming to achieve high-performance broadband electromagnetic shielding and microwave absorption materials. The behavior of co-enlargement in effective absorption band and attenuation and absorption mechanism of electrical/magnetic combination in electromagnetic shielding and microwave absorption will be discovered based on the characterization of the interface and structure of the graphene/magnetic heterostructures. The mechanism of electromagnetic shielding for thin films will also be discussed via fabricating and evaluating graphene-based thin film. The results in this project will provide experimental and theoretical knowledge for designing and modifying high-performance broadband electromagnetic shielding and microwave absorption materials, resulting in establishing a promising stage to large-scale fabricating electromagnetic shielding thin films in industry.

开展具有高性能、宽频段电磁屏蔽和微波吸收材料，发展轻质、高效电磁屏蔽薄膜，在信息安全和隐身技术领域具有重要的科学意义与工程应用价值。本项目依据电/磁共同增强电磁屏蔽和微波吸收的设计思想，依托高介电损耗/磁损耗异质结构为载体，以获得高性能、宽频段电磁屏蔽和微波吸收复合材料研究目标，提出设计石墨烯/磁性颗粒异质结构，发展对石墨烯及其磁性颗粒异质结构的制备和控制方法，实现基于高介电损耗和磁损耗材料的复合。通过研究石墨烯/磁性颗粒的界面结构和特征，阐明电/磁共同拓宽有效吸收频段的规律，揭示电/磁耦合对电磁屏蔽及微波吸收的衰减和吸收机制，设计石墨烯/磁性颗粒异质结构的薄膜材料，揭示电/磁耦合结构在薄膜材料中的屏蔽损耗机制，为高性能、宽频段电磁屏蔽与微波吸收材料的设计与性能调控提供实验与理论指导，为面向电磁屏蔽薄膜产品化奠定基础。

在本课题的资助下，设计了多种石墨烯基纳米新结构，研究了这些石墨烯基纳米结构在电磁场下的电磁响应特性，建立了电磁场作用场下跨尺度的电磁响应模型，揭示了石墨烯基纳米结构、形貌以及化学组分对电磁场响应的影响机制，实现了在吉赫兹频段下任意可调节的宽带微波吸收性能与电磁屏蔽性能，为发展新一代电磁响应材料材料奠定了重要的科学基础。