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Recent success in synthesizing two-dimensional borophene on silver substrateattracts strong interest in exploring its possible extraordinary physicalproperties. By using the density functional theory calculations, we show thatborophene is highly stretchable along the transverse direction. Thestrain-to-failure in the transverse direction is nearly twice as that along thelongitudinal direction. The straining induced flattening and subsequent stretchof the flat borophene are accounted for the large strain-to-failure for tensionin the transverse direction. The mechanical properties in the other twodirections exhibit strong anisotropy. Phonon dispersions of the strainedborophene monolayers suggest that negative frequencies are presented, whichindicates the instability of free-standing borophene even under high tensilestress.

Super-stretchable borophene and its stability under straining