Ultralight and ordered lamellar polyimide-based graphene foams with efficient broadband electromagnetic absorption

作     者：Yawei Zhang Shuangshuang Li Xinwei Tang Wei Fan Qianqian Lan Le Li Piming Ma Weifu Dong Zicheng Wang Tianxi Liu Yawei Zhang;Shuangshuang Li;Xinwei Tang;Wei Fan;Qianqian Lan;Le Li;Piming Ma;Weifu Dong;Zicheng Wang;Tianxi Liu

作者机构：The Key Laboratory of Synthetic and Biological ColloidsMinistry of EducationInstitute of Nanocomposites and Energy MaterialsSchool of Chemical and Material EngineeringJiangnan UniversityWuxi 214122China State Key Laboratory for Modification of Chemical Fibers and Polymer MaterialsCollege of Materials Science and EngineeringDonghua UniversityShanghai 201620China 

出 版 物：《Journal of Materials Science & Technology》 (材料科学技术（英文版）)

年 卷 期：2022年第102卷第7期

页      面：97-104页

核心收录：

学科分类：0817[工学-化学工程与技术] 0806[工学-冶金工程] 08[工学] 080501[工学-材料物理与化学] 0805[工学-材料科学与工程（可授工学、理学学位）] 0703[理学-化学] 0802[工学-机械工程] 0801[工学-力学（可授工学、理学学位）] 0702[理学-物理学] 

基　　金：financially supported by the National Natural Science Foundation of China (Nos. 21674019, 21704014, 52003106, 22008086, and 52003107) China Postdoctoral Science Foundation (Nos. 2020M671332, 2021M691265, and 2021M691266) Fundamental Research Funds for the Central Universities (Nos. 2232019A3-03 and JUSRP12032) Ministry of Education of the People’s Republic of China (No. 6141A0202202) Shanghai Scientific and Technological Innovation Project (No. 18JC1410600) 

主　　题：Polyimide Graphene Foam Ordered lamellar structure Microwave absorption 

摘      要：The development of high-performance microwave absorption materials with strong absorption capacity and broad bandwidth is highly desirable in the field of electromagnetic pollution ***,ultralight polyimide-based graphene foam with ordered lamellar structure is precisely designed and controllably constructed by bidirectional freezing *** lamellar interfaces formed inside the foam per unit volume effectively facilitate the layer-by-layer dissipation for the vertical incident electromagnetic waves,thereby endowing the foam with efficient broadband electromagnetic absorption *** importantly,electromagnetic absorption performance can be controllably adjusted by optimizing impedance distribution and microstructure of *** a result,the optimized foam with an ultralow density of 9.10 mg/cm^(3)presents a minimum reflection loss value of-61.29 dB at 9.25 GHz and an effective absorption bandwidth of 5.51 GHz(7.06-12.57 GHz,covering the whole X band) when the thickness is 4.75 mm.