Hybrid bilayers of carbon/NiBr2 anchoring on FeSiB surface for enhanced microwave absorption coupling with smart discoloration  

作　　者：Jun-Feng Wang Min Xia Jian-Ning Sun Hong-Yan Zhang Qi-Hui Sun Jun-Wei Wang Nasir Mahmood Xian Jian 

机构地区：[1]Yangtze Delta Region Institute(Huzhou),University of Electronic Science and Technology of China,Huzhou,313001,China [2]School of Metallurgical and Ecological Engineering,University of Science and Technology Beijing,Beijing,100083,China [3]School of Materials and Energy,University of Electronic Science and Technology of China,Chengdu,611731,China [4]School of Engineering,RMIT University,Melbourne,VIC,3001,Australia

出　　处：《Rare Metals》2025年第1期489-502,共14页稀有金属(英文版)

基　　金：supported by the National Natural Science Foundation of China(Nos.51972045 and 52202368);the Fundamental Research Funds for the Chinese Central Universities,China(No.ZYGX2019J025);Sichuan Science and Technology Program(No.2021YFG0373).

摘　　要：Developing bifunctional materials with smart discoloration and microwave absorption properties has attracted widespread interest in microwave absorption/shielding,yet it is challenging for reversible discoloration performance in humid(such as forest)and dry(desert)environments.Herein,we combined catalytic chemical vapor deposition(CCVD)technology and a hydrothermal synthesis method to develop a FeSiB@C@NiBr_(2) atomic-scale double-shell gradient structure with rich interfaces.These nanosheet arrays favor interface polarization,impedance matching,and dipole polarization of the material,thereby optimizing the microwave absorption performance.The optimal reflection loss(RL)value of FeSiB@C@NiBr_(2) reached-59.6 dB at 9.2 GHz,and the effective absorption bandwidth(EAB)reached 7.0 GHz at a thickness of 2.5 mm.Compared with pure FeSiB(RL_(min) of-13.5 dB),the RLmin value of the absorber designed by this method increased by~3 times.The color of NiBr_(2) in the outermost nanosheet arrays changes between yellow and green in the case of water molecule harvesting and loss,respectively.This novel FeSiB@C@NiBr_(2) composite structure material is expected to provide a promising platform for wave-absorbing and smart discoloring materials.

关 键 词：FeSiB Core-shell structure DISCOLORATION Microwave absorption 

分 类 号：P73[天文地球—海洋科学]