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Few-layer borophene prepared by mechanical resonance and its application in terahertz shielding.

Once two-dimensional boron based materials were forecasted, its excellent physical and chemical properties have realized the attractive application value in the field of material science. However, borophene couldn't exist independently and stably in nature. Molecular beam epitaxy (MBE) is the only way being used currently for preparation of borophene, which has low yield and harsh experimental installation conditions. Here, we propose the theory that few- layer borophene supported by silver nanoparticles can exist stably and perform large-scale preparation of few-layer borophene by mechanical resonance first. We have revealed the structure of prepared borophene is α-sheet and its thickness is less than 4 nm. The oxidation rate of borophene from the experiment is about 0.19, which indicates that the few-layer borophene possesses good structure stability. We have also studied the structure stability of the borophene on silver nanoparticles by the first principle calculation. The calculation proves that few-layer borophene can exist stably supported with silver nanoparticles. Furthermore, the terahertz shielding and stealth performance of the few-layer borophene has been explored. The maximum terahertz shielding effectiveness value of the prepared material could reach up to 50 dB and 21.5 dB for the reflection loss value in the broadband range of 0.1-2.7 THz. The large-scale preparation of few-layer borophene through mechanical method makes it possible to study the properties of borophene and achieves low-cost large-scale applications. Such as the study of terahertz shielding and stealth performance in the article which facilitate the lightweight material design for terahertz shielding and stealth.