High efficiency electromagnetic wave absorber derived from transition metal layered double hydroxides

Zehao Zhao; Kaichang Kou; Limin Zhang; Hongjing Wu

doi:10.1016/j.jcis.2020.06.123

High efficiency electromagnetic wave absorber derived from transition metal layered double hydroxides

J Colloid Interface Sci. 2020 Nov 1:579:733-740. doi: 10.1016/j.jcis.2020.06.123. Epub 2020 Jul 4.

Authors

Zehao Zhao¹, Kaichang Kou¹, Limin Zhang², Hongjing Wu³

Affiliations

¹ MOE Key Laboratory of Material Physics and Chemistry under Extraordinary, Northwestern Polytechnical University, Xi'an 710072, China.
² MOE Key Laboratory of Material Physics and Chemistry under Extraordinary, Northwestern Polytechnical University, Xi'an 710072, China. Electronic address: liminzhang@nwpu.edu.cn.
³ MOE Key Laboratory of Material Physics and Chemistry under Extraordinary, Northwestern Polytechnical University, Xi'an 710072, China. Electronic address: wuhongjing@nwpu.edu.cn.

PMID: 32673850
DOI: 10.1016/j.jcis.2020.06.123

Abstract

Transition metals and carbon materials are known as electromagnetic wave (EMW) nemesis, which can effectively attenuate EMW in the 2-18 GHz frequency band. Herein, three typical transition metal (Fe, Co, Ni) are freely combined into three layered double hydroxides (LDHs) through hydrothermal method and successfully grown in situ on the surface of short carbon fibers (SCFs). The SEM images show that although the three LDHs (CoNi-LDHs, FeNi-LDHs and FeCo-LDHs) are all sheet-like structures, their respective morphologies are completely different and each has its own merits. After calcination treatment at 500 °C, their distinct morphologies are basically retained, while the EMW absorption properties are greatly improved dramatically. Their effective absorption bandwidth (f_e) (RL ≤ -10 dB) reached 3.68 GHz, 1.68 GHz and 4.48 GHz at thicknesses of 2.2 mm, 2.2 mm and 2.0 mm, respectively. As an important transition metal-based material, the exploration of LDHs in EMW absorption has just begun.

Keywords: Electromagnetic wave; Impedance matching; Interfacial polarization; Layered double hydroxides.