Core-shell Ag@C spheres derived from Ag-MOFs with tunable ligand exchanging phase inversion for electromagnetic wave absorption

Yihe Song; Xuehua Liu; Zhenguo Gao; Zhengdong Wang; Yinghui Hu; Kai Yang; Zehao Zhao; Di Lan; Guanglei Wu

doi:10.1016/j.jcis.2022.04.012

Core-shell Ag@C spheres derived from Ag-MOFs with tunable ligand exchanging phase inversion for electromagnetic wave absorption

J Colloid Interface Sci. 2022 Aug 15:620:263-272. doi: 10.1016/j.jcis.2022.04.012. Epub 2022 Apr 8.

Authors

Yihe Song¹, Xuehua Liu², Zhenguo Gao³, Zhengdong Wang⁴, Yinghui Hu⁵, Kai Yang⁵, Zehao Zhao⁵, Di Lan⁵, Guanglei Wu⁶

Affiliations

¹ School of Mechanical and Electrical Engineering, Xi'an University of Architecture and Technology, Xi'an, 710055, China; School of Chemistry and Chemical Engineering, Northwestern Polytechnical University, Xi'an 710072, P. R. China.
² Institute of Materials for Energy and Environment, State Key Laboratory of Biofibers and Eco-textiles, College of Materials Science and Engineering, Qingdao University, Qingdao 266071, P. R. China.
³ School of Chemistry and Chemical Engineering, Northwestern Polytechnical University, Xi'an 710072, P. R. China. Electronic address: gaozhenguo@mail.nwpu.edu.cn.
⁴ School of Mechanical and Electrical Engineering, Xi'an University of Architecture and Technology, Xi'an, 710055, China. Electronic address: wangzhengdong@xauat.edu.cn.
⁵ School of Chemistry and Chemical Engineering, Northwestern Polytechnical University, Xi'an 710072, P. R. China.
⁶ Institute of Materials for Energy and Environment, State Key Laboratory of Biofibers and Eco-textiles, College of Materials Science and Engineering, Qingdao University, Qingdao 266071, P. R. China. Electronic address: wuguanglei@qdu.edu.cn.

PMID: 35429705
DOI: 10.1016/j.jcis.2022.04.012

Abstract

It has become greatly significant to achieve structurally tunable electromagnetic wave absorption materials (EMAs) derived from metal-organic frameworks (MOFs) via controllably continuous phase inversion. Herein, a series of core-shell Ag@C EMAs were successfully fabricated from Ag-MOFs via adjustable phase inversion. Replacing terephthalic acid (H₂BDC) with 2-methylimidazole (Hmim) continuously led to the gradual transformation of Ag-MOF-5 structure into ZIF-L, which determined the crystal and morphological structure of Ag@C EMAs. In addition, due to the optimization of relaxation loss, the minimum reflection loss (RL_min) of S2 reached -50.14 dB with a thickness of 3.0 mm. The EMA derived from the original Ag-MOF had the widest absorption bandwidth (f_E) of 5.44 GHz and RL_min of -47.36 dB at only 2.2 mm, respectively. This work can shed new light on the core-shell EMAs derived from phase inversion MOFs, and provide guidance to design novel high-performance EMAs.

Keywords: Ag-MOF; Ag@C; Electromagnetic wave absorption; Phase inversion.