Magnetic modulation of core@shell MoS2-based flower-like multicomponent nanocomposites to improve microwave attenuation

Yongchao Rao; Lin Long; Tao Jing; Xiaosi Qi; Qiong Peng; Xiu Gong; Yanli Chen; Ren Xie; Wei Zhong; Youwei Du

doi:10.1016/j.jcis.2021.10.138

Magnetic modulation of core@shell MoS₂-based flower-like multicomponent nanocomposites to improve microwave attenuation

J Colloid Interface Sci. 2022 Feb 15;608(Pt 3):2387-2398. doi: 10.1016/j.jcis.2021.10.138. Epub 2021 Nov 2.

Authors

Yongchao Rao¹, Lin Long¹, Tao Jing², Xiaosi Qi³, Qiong Peng¹, Xiu Gong¹, Yanli Chen¹, Ren Xie², Wei Zhong⁴, Youwei Du⁵

Affiliations

¹ College of Physics, Guizhou Province Key Laboratory for Photoelectrics Technology and Application, Guizhou University, Guiyang City 550025, People's Republic of China.
² College of Science, Kaili University, Kaili 556011, People's Republic of China.
³ College of Physics, Guizhou Province Key Laboratory for Photoelectrics Technology and Application, Guizhou University, Guiyang City 550025, People's Republic of China; National Laboratory of Solid State Microstructures and Jiangsu Provincial Laboratory for NanoTechnology, Nanjing University, Nanjing 210093, People's Republic of China. Electronic address: xsqi@gzu.edu.cn.
⁴ National Laboratory of Solid State Microstructures and Jiangsu Provincial Laboratory for NanoTechnology, Nanjing University, Nanjing 210093, People's Republic of China. Electronic address: wzhong@nju.edu.cn.
⁵ National Laboratory of Solid State Microstructures and Jiangsu Provincial Laboratory for NanoTechnology, Nanjing University, Nanjing 210093, People's Republic of China.

PMID: 34763891
DOI: 10.1016/j.jcis.2021.10.138

Abstract

Nanocomposites with a three-dimensional (3D) flower-like geometrical morphology were considered as excellent microwave absorbers (MAs) because of the numerous effective sites for the multiple reflections of electromagnetic (EM) wave. Herein, for optimizing the EM matching characteristic and taking full advantage of interface polarization, a strategy of magnetic modulation was proposed to further improve the EM wave absorption performances (EMWAPs) of MoS₂-based nanocomposites. We adopted a simple hydrothermal route and a combined method of hydrothermal treatment/hydrogen reduction to synthesize core@shell CoFe₂O₄@MoS₂ and CoFe@MoO₂/MoS₂ flower-like nanocomposites, respectively. The obtained results indicated that the hydrogen reduction effectively improved their magnetic properties and magnetic loss capabilities, and their 3D flower-like geometrical morphologies were well maintained during the hydrogen reduction process. The obtained core@shell CoFe@MoO₂/MoS₂ flower-like nanocomposites presented the extraordinary comprehensive EMWAPs including the optimal reflection loss value of -54.83 dB with the matching thicknesses (d_m) value of 2.05 mm and effective absorption bandwidth value of 6.40 GHz with the d_m value of 2.59 mm, which were evidently superior to the properties of CoFe₂O₄@MoS₂. Therefore, the findings provided an effective pathway to further improve EMWAPs of MoS₂-based core@shell nanocomposites and the as-prepared core@shell CoFe@MoO₂/MoS₂ flower-like nanocomposites could be utilized as the novel high-efficient MAs.

Keywords: Broad absorption bandwidth; CoFe@MoO(2)/MoS(2) flower-like nanocomposites; Interface polarization; Magnetic modulation; Strong microwave absorption.