Constructing WSe2@CNTs heterojunction to tune attenuation capability for efficient microwave absorbing and green EMI shielding

• Published in: Applied surface science 2022-08, Vol.592, p.153253, Article 153253
• Main Authors: Zhu, Yuhang, Wang, Qiangqiang, Han, Yuhang, Li, Lin, Cao, Maosheng
• Format: Article
• Language: English
• Subjects: EMI shielding; Microwave absorbing; Multi-walled carbon nanotube; WSe2 nanosheet
• ISSN: 0169-4332; 1873-5584
• DOI: 10.1016/j.apsusc.2022.153253

[Display omitted] •WSe2@CNTs heterojunction with highly efficient wave absorption was constructed.•WSe2@CNTs heterojunction has green EMI shielding function.•The mechanism of tunable EM properties for dual EM functions was revealed. CNTs, with high electrical conductivity, are considered as an excellent electromagnetic (EM) attenuation material, and have attracted the attention of countless researchers for a long time. However, there is a daunting challenge to obtain both microwave absorbing and electromagnetic interference (EMI) shielding functions in a same material. Herein, by constructing WSe2@CNTs heterojunction, excellent microwave absorbing and EMI shielding is obtained, which is attributed to the tunable dielectric properties. The WSe2@CNTs composite shows high reflection loss (RL) of −61.6 dB, broad effective absorption bandwidth (EAB) of 4.56 GHz, and efficient EMI shielding. More importantly, high green shielding index (>1) is found in the Ku band. This result confirms the WSe2@CNTs composite as a suitable candidate for EM bifunctional materials. Meanwhile, this strategy of constructing heterojunction provides a valuable guide for designing novel EM attenuation materials in the future.