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We demonstrate a novel cross‐sectional deformation, called the radial corrugation, of multi‐walled carbon nanotubes (MWNTs) under hydrostatic pressure. Theoretical analyses based on the continuum elastic approximation have revealed that MWNTs consisting of more than ten concentric walls undergo elastic deformations at critical pressure  $p_{\rm c} \simeq {\rm 1}\,{\rm GPa}$ , above which the circular shape of the cross‐section becomes radially corrugated. Various corrugation modes have been observed by tuning the innermost tube diameter and the number of constituent walls, which is a direct consequence of the core–shell structure of MWNTs.  Cross‐sectional views of MWNT under high hydrostatic pressure: elliptic deformation with the mode index  n  = 2 (left), and radial corrugations with  n  = 5 (center), and  n  = 6 (right). The index  n  indicates the circumferential wave number of the deformed cross‐section.

Pressure‐induced structural transitions in multi‐walled carbon nanotubes