(A, B, C) Section analysis along a-a’, b-b’ and c-c’ lines in AFM height image (D). a-a’ line goes along the axis of an individual SWNT wrapped with SPEEK, while b-b’ goes perpendicularly to the SPEEK-wrapped SWNT surface, while c-c’ line is placed in the part where SWNT surface is bare. (E) A close-up phase image of nanotubes in (D). The cartoon in (A) inset demonstrates helical wrapping of SPEEK around SWNT.