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

Rui Jiang; Yiqun Wang; Jiayao Wang; Qinchuan He; Guanglei Wu

doi:10.1016/j.jcis.2023.05.197

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

J Colloid Interface Sci. 2023 Oct 15:648:25-36. doi: 10.1016/j.jcis.2023.05.197. Epub 2023 Jun 5.

Authors

Rui Jiang¹, Yiqun Wang², Jiayao Wang¹, Qinchuan He¹, Guanglei Wu³

Affiliations

¹ College of Materials and Chemistry & Chemical Engineering, Chengdu University of Technology, Chengdu, Sichuan 610059, China.
² College of Materials and Chemistry & Chemical Engineering, Chengdu University of Technology, Chengdu, Sichuan 610059, China. Electronic address: wangyiqun17@cdut.edu.cn.
³ Institute of Materials for Energy and Environment, State Key Laboratory of Bio-fibers and Eco-textiles, College of Materials Science and Engineering, Qingdao University, Qingdao 266071, China. Electronic address: wuguanglei@qdu.edu.cn.

PMID: 37295367
DOI: 10.1016/j.jcis.2023.05.197

Abstract

The design of metal-organic frameworks (MOF) derived composites with multiple loss mechanisms and multi-scale 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@NC) are obtained by a MOF assisted strategy. By utilizing the special structure of MOF and regulating its composition, the effective improvement of Ni-MOF@NC's microwave absorption performance has been achieved. The nanostructure on the surface of core-shell Ni-MOF@NC can be regulated and N doping on carbon skeleton by adjusting the annealing temperature. The optimal reflection loss of Ni-MOF@NC 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@NC. 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.

Keywords: Core-shell structure; Coupling effects; Metal-organic frameworks; Microwave absorption; Multi-scale.