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

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.