文献类型：期刊文献

英文题名：Synergistic 2D structure design and high-entropy engineering in MnFeCoNiCu nanoalloy/carbon nanosheet composite to optimize impedance matching for high-attenuation microwave absorption

作者：Wang, Xueyang[1,2];Su, Zhe[2];Tian, Xuanye[1];Li, Guixiang[2];Zhang, Kaili[2,3];Luo, Yi[2];Niu, Bo[1,2];Long, Donghui[1,2]

机构：[1]East China Univ Sci & Technol, Minist Educ, Key Lab Specially Funct Polymer Mat & Related Tech, Shanghai 200237, Peoples R China;[2]Suzhou Lab, Struct Mat Res Dept, Suzhou 215000, Peoples R China;[3]Harbin Inst Technol, Sch Mat Sci & Engn, Harbin 150001, Peoples R China

年份：2026

外文期刊名：JOURNAL OF MATERIALS CHEMISTRY A

收录：;EI(收录号：20262320834137);WOS:【SCI-EXPANDED(收录号:WOS:001782407500001)】；

基金：This work was supported by the National Natural Science Foundation of China (No. 52472095 and U2341291).

语种：英文

外文关键词：Absorption - Carbon - Entropy - Foams - High-entropy alloys - Magnetic couplings - Magnetic moments - Manganese alloys - Nanosheets

摘要：High-entropy alloys (HEAs) are promising for microwave absorption owing to their excellent electrical and magnetic properties, yet achieving high-attenuation performance remains challenging. Herein, we report the synthesis of MnFeCoNiCu high-entropy nanoalloy/carbon nanosheet composites (MnFeCoNiCu/CSs) derived from a gluconate-based MnFeCoNiCu high-entropy solid solution with glucose as a self-foaming agent. A pre-foaming (400 degrees C) followed by carbothermal shock (1000 degrees C) strategy is employed, yielding excellent microwave absorption performance. By precisely tuning the carbon content in the MnFeCoNiCu/CSs, the impedance matching is optimized, enabling a synergistic dielectric-magnetic attenuation effect. First-principles calculations reveal that the intrinsic ferromagnetism and high-entropy nature of the MnFeCoNiCu nanoalloy induce magnetic moment resonance, magnetic coupling, and electronic dipole polarization. Meanwhile, the abundant alloy-carbon interfaces and the two-dimensional lamellar carbon skeleton facilitate interfacial polarization and conductive loss. The complementary magnetic-dielectric dissipation mechanisms endow MnFeCoNiCu/CS-1 with excellent impedance matching, achieving a minimum reflection loss (RLmin) of -54.4 dB at a thickness of 1.86 mm. Moreover, MnFeCoNiCu/CS-1 exhibits a maximum radar cross-section (RCS) reduction of 31.96 dB m2, demonstrating its potential for practical applications. This work provides a feasible strategy for preparing HEAs/carbon composites with optimized impedance matching toward excellent microwave performance.