Hetero-structured construction of RGO nanosheets decorated by flower-like MoS2 toward the regulation of electromagnetic wave absorption performance

Abstract

Exploring high-efficiency graphene-based electromagnetic wave (EMW) absorption materials is urgently required owing to the increasingly severe electromagnetic radiation pollution. However, the serious impedance mismatching caused by the superior conductivity of graphene and finite attenuation mechanism constrain its development. Herein, MoS₂@RGO with plentiful heterointerfaces are fabricated by a facile solvothermal strategy to realize outstanding EMW absorption. The incorporation of MoS₂ could not only effectively reduce the conductivity of RGO to alleviate the impedance mismatching issue, but also greatly enrich the loss mechanisms. In addition, the construction of flower-like MoS₂ assembled by MoS₂ could greatly prolong the transmission path of EMW through multiple reflection and scattering. The improved impedance matching and multiple dissipation mechanisms jointly endow the developed materials with brilliant EMW absorption performance. The prepared MoS₂@RGO with a 1:1 ratio of MoS₂ to RGO (MR3) at a low filler loading of 20 wt% achieves the minimum reflection loss of -69.6 dB at the frequency of 8.46 GHz under a low thickness of 2.77 mm and a broad effective absorption bandwidth of 4.36 GHz (from 11.00 to 15.36 GHz). Notably, the effectiveness of the resultant MR composites used as actual absorbers is strongly verified by the radar cross section simulation. This work opens up new possibilities for constructing hetero-structured graphene-based composites with rich heterointerfaces toward excellent electromagnetic protection.