Controlled formation of multiple core-shell structures in metal-organic frame materials for efficient microwave absorption

被引:78
作者
Jiang, Rui [1 ]
Wang, Yiqun [1 ]
Wang, Jiayao [1 ]
He, Qinchuan [1 ]
Wu, Guanglei [2 ]
机构
[1] Chengdu Univ Technol, Coll Mat & Chem & Chem Engn, Chengdu 610059, Sichuan, Peoples R China
[2] Qingdao Univ, Inst Mat Energy & Environm, Coll Mat Sci & Engn, State Key Lab Biofibers & Ecotext, Qingdao 266071, Peoples R China
基金
中国国家自然科学基金;
关键词
Core -shell structure; Multi; -scale; Coupling effects; Metal -organic frameworks; Microwave absorption; ELECTROMAGNETIC-WAVE ABSORPTION; HIGH-PERFORMANCE; POROUS CARBON; MICROSPHERES; COMPOSITES; CONSTRUCTION; LIGHTWEIGHT; NANOSHEETS; THICKNESS; BANDWIDTH;
D O I
10.1016/j.jcis.2023.05.197
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
The design of metal-organic frameworks (MOF) derived composites with multiple loss mechanisms and multiscale micro/nano structures is an important research direction of microwave absorbing materials. Herein, multi-scale bayberry-like Ni-MOF@N-doped carbon composites (Ni-MOF@N-C) are obtained by a MOF assisted strategy. By utilizing the special structure of MOF and regulating its composition, the effective improvement of Ni-MOF@N-C's microwave absorption performance has been achieved. The nanostructure on the surface of core-shell Ni-MOF@N-C can be regulated and N doping on carbon skeleton by adjusting the annealing temperature. The optimal reflection loss of Ni-MOF@N-C is -69.6 dB at 3 mm, and the widest effective absorption bandwidth is 6.8 GHz. This excellent performance can be attributed to the strong interface polarization caused by multiple core-shell structures, the defect and dipole polarization caused by N doping, and the magnetic loss caused by Ni. Meanwhile, the coupling of magnetic and dielectric properties enhances the impedance matching of Ni-MOF@N-C. The work proposes a particular idea of designing and synthesizing an applicable microwave absorption material that possesses excellent microwave absorption performance and promising application potential.
引用
收藏
页码:25 / 36
页数:12
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