文献类型：期刊文献

英文题名：A heterojunction of high-entropy alloy and nitrogen-doped carbon nanospheres for efficient electromagnetic wave absorption

作者：Zhang, Qin[1];Ye, Ying[1];Sun, Lei[1];Sun, Ping[2];Wei, Jie[1];Gan, Qi[1]

机构：[1]East China Univ Sci & Technol, Sch Mat Sci & Engn, Shanghai Key Lab Adv Polymer Mat, Shanghai 200237, Peoples R China;[2]Shanghai Eighth Peoples Hosp, Dept Orthoped, Shanghai 200235, Peoples R China

年份：2025

卷号：13

期号：14

起止页码：7205

外文期刊名：JOURNAL OF MATERIALS CHEMISTRY C

收录：;EI(收录号：20251018014402);WOS:【SCI-EXPANDED(收录号:WOS:001435821900001)】；

基金：This study is financially supported by the National Natural Science Foundation of China (32171340, 81771990, 81271705 and 81772342).

语种：英文

外文关键词：Cesium alloys - Dielectric losses - Impedance matching (electric) - Iron alloys - Nanospheres - Radar reflection

摘要：FeCoNi-based high-entropy alloys (HEAs) with exceptional soft magnetic properties and electrical conductivity are utilized for electromagnetic wave (EMW) absorption. Nevertheless, these materials have limitations in terms of high density, susceptibility to oxidation, impedance mismatching, etc. Herein, a high-entropy alloy (HEA) of FeCoNiCuAl is prepared through a sol-gel process, and a heterojunction of this HEA and nitrogen-doped carbon (HEA/NC) is constructed by in situ polymerization and subsequent annealing treatment. The incorporation of NC with the defects induced by nitrogen atom doping not only optimizes the impedance matching, but also enhances dielectric loss properties of HEA/NC through dipole and interfacial polarization. The remarkable EMW absorption properties of HEA/NC are ascribed to the magnetic-dielectric synergistic loss. At a thickness of 1.80 mm, the minimum reflection loss (RLmin) is -56.38 dB and the maximum effective absorption bandwidth (EAB) is 5.69 GHz. Furthermore, the radar scattering cross-section (RCS) calculated using CST software can reach -19.05 dBm2 in an actual environment, thereby confirming its excellent EMW absorption properties. In summary, this study offers new insights into the design and fabrication of HEAs as highly effective EMW absorption materials.