Two-dimensional nanosheets of MoS2: a promising material with high dielectric properties and microwave absorption performance.
In this study, few-layered MoS2 nanosheets (MoS2-NS) were obtained via the top-down exfoliation method from bulk MoS2 (MoS2-Bulk), and the dielectric properties and microwave absorption performance of MoS2-NS were first reported. The dimension-dependent dielectric properties and microwave absorption performance of MoS2 were investigated by presenting a comparative study between MoS2-NS and MoS2-Bulk. Our results show that the imaginary permittivity (ε'') of MoS2-NS/wax is twice as large as that of MoS2-Bulk/wax. The minimum reflection loss (RL) value of MoS2-NS/wax with 60 wt% loading is -38.42 dB at a thickness of 2.4 mm, which is almost 4 times higher than that of MoS2-Bulk/wax, and the corresponding bandwidth with effective attenuation (<-10 dB) of MoS2-NS/wax is up to 4.1 GHz (9.6-13.76 GHz). The microwave absorption performance of MoS2-NS is comparable to those reported in carbon-related nanomaterials. The enhanced microwave absorption performance of MoS2-NS is attributed to the defect dipole polarization arising from Mo and S vacancies and its higher specific surface area. These results suggest that MoS2-NS is a promising candidate material not only in fundamental studies but also in practical microwave applications.
School of Material Science and Engineering, Beijing Institute of Technology, Beijing 100081, China. hbjin@bit.edu.cn lijb@bit.edu.cn caomaosheng@bit.edu.cn.
Ming-Qiang
MQ
Ning
Ming-Ming
MM
Lu
Jing-Bo
JB
Li
Zhuo
Z
Chen
Yan-Kun
YK
Dou
Cheng-Zhi
CZ
Wang
Fida
F
Rehman
Mao-Sheng
MS
Cao
Hai-Bo
HB
Jin