Flexible Metamaterial Absorbers Based on Fe<sub>3</sub>O<sub>4</sub>-Doped Laser-Induced Graphene with Tunable Absorption Bands
Chunhui Chen, Siyi Bi, Yu Bai, Minghao Li, Ziyang Jiang, Wenqing Hai, Yu-Xin Zong, Huiqi Shao, Guangwei Shao, Jinhua Jiang, Nanliang Chen
Abstract
Due to widespread applications of electromagnetic waves (EMWs) in radar and communication systems, there is an urgent need for developing EMW absorbers capable of working efficiently at multiple frequency points. In this work, flexible metamaterial absorbers (MAs) based on Fe 3 O 4 -doped laser-induced graphene (LIG/Fe 3 O 4 ) are large-scale fabricated with the absorption bands tunable by regulating ferric chloride concentration and laser path of the LIG/Fe 3 O 4 meta-surface. The as-prepared triple band LIG/Fe 3 O 4 MA demonstrates superior S 11 values of −15.0 dB (9.0 GHz), −40.7 dB (12.2 GHz), and −23.2 dB (16.8 GHz), respectively, attributed to subwavelength units of LIG/Fe 3 O 4, synergistically combining dielectric and magnetic loss. Moreover, LIG/Fe 3 O 4 MAs exhibit commendable corrosion resistance and radar cross-section reduction characteristics, showing promising potential in electromagnetic protection fields.