VSe₂/CNTs nanocomposites toward superior electromagnetic wave absorption performance

Electromagnetic radiation pollution has become a serious threat, which will harm human health and interfere with electronic devices. However, it is still a challenge to develop high-efficiency electromagnetic wave absorbers with wide frequency band and strong absorption, especially for realizing the features of multi-bands absorption. Herein, VSe₂/CNTs nanocomposites were successfully synthesized with crosslinked CNTs distributed on VSe₂ nanoclusters composed of nanosheets. Importantly, the electromagnetic properties and absorption performance of the VSe₂/CNTs nanocomposites can be effectively tailored by changing the hybrid ratio of CNTs and VSe₂ nanosheets (VSe₂-NSs). The increase of CNTs content promotes the formation of a conductive network and leads to the increase of permittivity. The VSe₂/CNTs nanocomposite with CNTs of 40 mg exhibits the best electromagnetic wave absorption performance, the minimum reflection loss (RL) reaches −57.53 dB at 5.52 GHz and is about 6 times more than VSe₂-NSs. Meanwhile, the VSe₂/CNTs nanocomposite with CNTs of 30 mg shows dual-bands absorption performance with a minimum RL value of −50.06 dB at 3.84 GHz and the total effective absorption bandwidth of 3.32 GHz. This result proves that VSe₂/CNTs nanocomposites can be promising candidates as high-efficiency electromagnetic wave absorption material and provides a feasible idea for designing a high-performance electromagnetic wave absorber.