Ab initio study of the vibrational properties of single-walled silicon nanotubes

► Vibrational properties for hexagonal single walled silicon nanotubes by DFT and frozen phonons. ► Phononic band structure. ► The structures are stable. ► Vibrational density of states and influence of isotopic substitutions upon the vibrational density of states. ► Vibrational modes can be controlled by isotopic substitutions.