A simple hydrothermal process to grow MoS2 nanosheets with excellent dielectric loss and microwave absorption performance

Abstract

In this study, two-dimensional MoS₂ nanosheets synthesized by a hydrothermal method were firstly investigated for microwave absorbing performance. The obtained MoS₂ nanosheets are highly desirable as an electromagnetic wave (EM) absorber because of its larger interfacial polarization and high dielectric loss. Our results show that the real and imaginary parts of permittivity of MoS₂ prepared at 180 °C are higher than those of other samples. A broad bandwidth absorption at a thin thickness can be obtained between 2 and 18 GHz. The microwave reflection loss (RL) of MoS₂ nanosheets prepared at 180 °C reaches as high as −47.8 dB at 12.8 GHz due to its high electrical conductivity and the polarization effect. It can also be found that MoS₂ exhibits an effective electromagnetic wave absorption bandwidth of 5.2 GHz (<−10 dB) at the thicknesses of 1.9 and 2.0 mm. The results showed that the MoS₂ nanosheets can be a candidate for microwave absorption with a broad effective absorption bandwidth at thin thicknesses.