文献类型：期刊文献

英文题名：Constructing crystalline/amorphous heterojunction in FeCo@C nanoboxes for enhanced electromagnetic wave absorption

作者：Wang, Ruoqi[1];He, Yu[1];Tang, Chuanhao[1];Wu, Xiaohan[1];Zhuang, Qixin[1];Liu, Xiaoyun[1];Liu, Xing[2];Zuo, Peiyuan[1]

机构：[1]East China Univ Sci & Technol, Sch Mat Sci & Engn, Key Lab Special Funct Polymer Mat & Related Techn, Minist Educ, Shanghai 200237, Peoples R China;[2]Wuhan Univ Technol, Sch Mat Sci & Engn, State Key Lab Adv Technol Mat Synth & Proc, Wuhan 430070, Peoples R China

年份：2024

卷号：229

外文期刊名：CARBON

收录：;EI(收录号：20243216804078);WOS:【SCI-EXPANDED(收录号:WOS:001288676600001)】；

基金：Acknowledgements All authors are grateful for financial support from the National Natural Science Foundation of China (52303083, 52373073, 22171086) , Shanghai Pujiang Program (22PJ1402500) and the Key Laboratory of Advanced Polymeric Materials of Shanghai.

语种：英文

外文关键词：Microwave absorption; Heterojunction; MOF analogs; Hollow structures

摘要：The advanced electromagnetic applications urgently require high performance absorbers with sophisticated structural and compositional design. An effective strategy is to construct a three-dimensional hollow structure, with enhanced electromagnetic wave dissipation capacity over a wide effective absorption bandwidth. However, a major challenge remains due to a single loss mechanism system derived from the conventional hollow nanobox structure, which seriously causes impedance mismatch and lack of polarization centers. Herein, we innovatively construct novel hollow structure FeCo@C (CMFC) with crystalline/amorphous heterojunction FeCo/C particles by cation exchange method, thereby achieving enhanced electromagnetic wave absorption. The CMFC achieves Ku-band effective absorption with a reflection loss of-50.57 dB and effective absorption bandwidth of 5.35 GHz at 1.8 mm. The CMFC exhibits excellent microwave absorption performance due to the presence of crystalline/ amorphous FeCo/C heterojunction, which is attributed to the balanced dielectric loss and optimized impedance matching characteristics. CST simulations demonstrate that the CMFC has a radar scattering interface reduction value as high as 26.12 dBm (Wu et al., 2023) [2] at a scattering angle of 0 degrees. This work provides new ideas for the rational design of hollow nanostructures with heterojunction particles for efficient microwave absorption.