Insight to the enhanced microwave absorption of porous N-doped carbon driven by ZIF-8:Competition between graphitization and porosity

作     者：You Zhou Hongpeng Wang Dan Wang Xianfeng Yang Hongna Xing Juan Feng Yan Zong Xiuhong Zhu Xinghua Li Xinliang Zheng Zhou You;Wang Hongpeng;Wang Dan;Yang Xianfeng;Xing Hongna;Feng Juan;Zong Yan;Zhu Xiuhong;Li Xinghua;Zheng Xinliang

作者机构：School of PhysicsState Key Laboratory of Photoelectric Technology and Functional MaterialsNorthwest UniversityXi’an 710127China 

出 版 物：《International Journal of Minerals,Metallurgy and Materials》 (矿物冶金与材料学报（英文版）)

年 卷 期：2023年第30卷第3期

页      面：474-484页

核心收录：

学科分类：08[工学] 0805[工学-材料科学与工程（可授工学、理学学位）] 080502[工学-材料学] 

基　　金：financially supported by National Natural Science Foundation of China(Nos.51572218 and 11504293) Natural Science Foundation of Shaanxi Province(No.2019JM-138) Natural Science Foundation from Department of Science and Technology of Shaanxi Province(Nos.2021JQ-431,2021JM-304,and 2021JQ-427) Scientific Research Program Funded by Shaanxi Provincial Education Department(No.20JK0946) 

主　　题：N-doped carbon porosity dielectric impedance matching microwave absorption 

摘      要：Porous carbon-based materials are promised to be lightweight dielectric microwave *** understanding the influence of graphitization grade and porous structure on the dielectric parameters is urgently ***,utilizing the low boiling point of Zn,porous N-doped carbon was fabricated by carbonization of ZIF-8(Zn)at different temperature,and the microwave absorption performance was *** porous N-doped carbon inherits the high porosity of ZIF-8 *** increasing the carbonization temperature,the contents of Zn and N elements are decreased;the graphitization degree is improved;however,the specific surface area and porosity are increased first and then *** the carbonization temperature is 1000°C,the porous N-doped carbon behaves enhanced microwave *** an ultrathin thickness of 1.29 mm,the ideal RL reaches-50.57 dB at 16.95 GHz and the effective absorption bandwidth is 4.17 *** mechanism of boosted microwave absorption is ascribed to the competition of graphitization and porosity as well as N dopants,resulting in high dielectric loss capacity and good impedance *** porous structure can prolong the pathways and raise the contact opportunity between microwaves and porous carbon,causing multiple scattering,interface polarization,and improved impedance ***,the N dopants can induce electron polarization and defect *** results give a new insight to construct lightweight carbon-based microwave absorbents by regulating the graphitization and porosity.