Anion-substitution interfacial engineering to construct C@MoS2 hierarchical nanocomposites for broadband electromagnetic wave absorption

Aming Xie; Ronghui Guo; Lipeng Wu; Wei Dong

doi:10.1016/j.jcis.2023.07.169

Anion-substitution interfacial engineering to construct C@MoS₂ hierarchical nanocomposites for broadband electromagnetic wave absorption

J Colloid Interface Sci. 2023 Dec:651:1-8. doi: 10.1016/j.jcis.2023.07.169. Epub 2023 Jul 27.

Authors

Aming Xie¹, Ronghui Guo², Lipeng Wu³, Wei Dong⁴

Affiliations

¹ School of Mechanical Engineering, Nanjing University of Science and Technology, Nanjing 210094, China. Electronic address: xieaming@njust.edu.cn.
² School of Mechanical Engineering, Nanjing University of Science and Technology, Nanjing 210094, China.
³ School of Mechanical Engineering, Nanjing University of Science and Technology, Nanjing 210094, China; School of Chemistry and Chemical Engineering, Nanjing University of Science and Technology, Nanjing 210094, China. Electronic address: 1552680310@qq.com.
⁴ School of Chemistry and Chemical Engineering, Nanjing University of Science and Technology, Nanjing 210094, China.

PMID: 37536255
DOI: 10.1016/j.jcis.2023.07.169

Abstract

Developing an effective strategy to regulate the interfacial properties of hierarchical structure is of great significance for preparation of high-performance electromagnetic wave absorption (EMA) materials. Ion-substitution can change intrinsic structure and properties of a materials, but its effect on the interfacial properties of hierarchical structure remained to be explored. Herein, we first constructed a C@MoS₂ hierarchical structure via simple hydrothermal reaction, then used the ion-substitution strategy to replace the S atoms in MoS₂ with O, F and Se, and finally obtained anion-substituted hierarchical structure (C@X-MoS₂, X = O, F, Se). The results show that ion-substitution destroys the MoS₂ crystal structure and realizes tunable dielectric properties of C@MoS₂, which leads to further enhancement of overall interfacial polarization. After optimization, the absorption strength and width of C@O-MoS₂ has been significantly improved. The minimum reflection loss (RL_min) reaches -62.17 dB, and the maximum effective absorption bandwidth (EAB_max) is 7.0 GHz. The simulation results show the obtained absorbent can greatly reduce the radar cross section of target, indicating it has broad application potential. Therefore, this work provides a novel method for regulation of EMA performance of hierarchical structure and preparation of high-performance absorbents.

Keywords: Electromagnetic wave absorption; Hierarchical structure; Ion-substitution; MoS(2).