Mechanical properties of platinum nanowires: An atomistic investigation on single-crystalline and twinned structures

► Fivefold twinned nanowire exhibits higher Young's modulus than the single-crystalline one. ► Fivefold twinned nanowire has higher yielding strength but lower ductility than the single-crystalline one. ► The destructive twin boundaries initiates the fracture of twinned nanowire.